CVE-2026-53586

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-53586
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53586.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-53586
Aliases
  • GHSA-2889-x8f6-mc4x
Downstream
Related
Published
2026-08-20T18:40:08.673Z
Modified
2026-08-23T10:47:10.771809Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N CVSS Calculator
Summary
libgit2: HTTP transport can leak credentials to an offsite redirect target
Details

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, the built-in HTTP transport in src/libgit2/transports/http.c follows an offsite initial redirect, and handleremoteauth and handleauth pass transport->owner->url instead of transport->server.url to the credential callback when the redirected host returns 401 Unauthorized. A callback that scopes credentials to the original trusted URL can therefore return GITCREDENTIALUSERPASSPLAINTEXT credentials that libgit2 stores in transport->server.cred and sends as an Authorization header to the redirected host. An attacker who controls a trusted Git host or an open redirect on that host can disclose HTTP Basic credentials, personal access tokens, or equivalent credentials. This issue is fixed in versions 1.8.6 and 1.9.5.

Database specific 
{
    "cwe_ids": [
        "CWE-200",
        "CWE-522",
        "CWE-601"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53586.json"
}
References

Affected packages

Git / github.com/libgit2/libgit2

Affected ranges

Type
GIT
Repo
https://github.com/libgit2/libgit2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Introduced
338e6fb681369ff0537719095e22ce9dc602dbf0
Fixed
5853918c4c6a7b12f8becf4bd11ff4362ebb9020
Fixed
f7a4071c766ceea3915415e22134cbe3e581c420
Fixed
07de6a7e438f95ac9a6efd3222a82117e871ed27
Fixed
af2b29ad0a74d5bac9751376879ddaf848136d3b
Fixed
c1507abc44647b3acd832a33a5b1c8c9f5ba8821
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.6"
        },
        {
            "introduced": "1.9.0"
        },
        {
            "fixed": "1.9.5"
        }
    ]
}

Affected versions

v0.*
v0.1.0
v0.10.0
v0.11.0
v0.12.0
v0.13.0
v0.14.0
v0.15.0
v0.16.0
v0.17.0
v0.18.0
v0.2.0
v0.21.0
v0.22.0
v0.22.0-rc1
v0.22.0-rc2
v0.23.0
v0.23.0-rc1
v0.23.0-rc2
v0.24.0
v0.24.0-rc1
v0.26.0
v0.26.0-rc1
v0.26.0-rc2
v0.27.0
v0.27.0-rc1
v0.27.0-rc2
v0.27.0-rc3
v0.28.0
v0.28.0-rc1
v0.3.0
v0.8.0
v0.99.0
v1.*
v1.0.0
v1.1.0
v1.2.0
v1.3.0
v1.4.0
v1.5.0
v1.6.1
v1.6.2
v1.6.3
v1.7.0
v1.8.0
v1.8.1
v1.8.3
v1.8.4
v1.8.5
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53586.json"
vanir_signatures 
[
    {
        "digest": {
            "function_hash": "225777753145150605025461996781650096255",
            "length": 484.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-088f72fb",
        "source": "https://github.com/libgit2/libgit2/commit/af2b29ad0a74d5bac9751376879ddaf848136d3b",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_remote_auth"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "225777753145150605025461996781650096255",
            "length": 484.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-11a1dc0d",
        "source": "https://github.com/libgit2/libgit2/commit/07de6a7e438f95ac9a6efd3222a82117e871ed27",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_remote_auth"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "233054586897221852713287291746647347337",
            "length": 1529.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-12e2fb4b",
        "source": "https://github.com/libgit2/libgit2/commit/c1507abc44647b3acd832a33a5b1c8c9f5ba8821",
        "target": {
            "file": "tests/libgit2/online/clone.c",
            "function": "test_online_clone__cleanup"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "208966527604137913452720017806345171563",
            "length": 2456.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-3dce8ea4",
        "source": "https://github.com/libgit2/libgit2/commit/c1507abc44647b3acd832a33a5b1c8c9f5ba8821",
        "target": {
            "file": "tests/libgit2/online/clone.c",
            "function": "test_online_clone__initialize"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "21239647138274559075372053953119188355",
            "length": 876.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-3e40b2ad",
        "source": "https://github.com/libgit2/libgit2/commit/07de6a7e438f95ac9a6efd3222a82117e871ed27",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_auth"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "292090992641920243916529641330655405346",
            "length": 485.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-49e05fb5",
        "source": "https://github.com/libgit2/libgit2/commit/07de6a7e438f95ac9a6efd3222a82117e871ed27",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_proxy_auth"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "292090992641920243916529641330655405346",
            "length": 485.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-4e5821fd",
        "source": "https://github.com/libgit2/libgit2/commit/c1507abc44647b3acd832a33a5b1c8c9f5ba8821",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_proxy_auth"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "225777753145150605025461996781650096255",
            "length": 484.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-5ab125b5",
        "source": "https://github.com/libgit2/libgit2/commit/c1507abc44647b3acd832a33a5b1c8c9f5ba8821",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_remote_auth"
        },
        "deprecated": false
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "292894123169329908573221382736719689130",
                "45691261651861175910323428934692818972",
                "219899257416663776281737352721997551642",
                "30471715161870962019297185028303214131",
                "242587518969759694907851457444711161959",
                "70770410110744336111878526066025820786",
                "194940770660331527869366277062606724607",
                "275810513160097991676880721772596738911",
                "78362828072653138263658392132753516808",
                "50138403786554015781826161590171684170",
                "333189531666698533891715896143604570877",
                "134032226687034903566410851966269299282",
                "72560919542960246025669722317294072353",
                "334285288392661952764871398094729519093",
                "193796507953802999933366682774306510472",
                "231452813322631493322072844986568107104",
                "211343763167986509495999619827877561891",
                "140449934440117550191088601710543942578",
                "64011064049084059199643514393210194407",
                "219912261095537977924916121581914830221",
                "51566544700613081438128040857558996849",
                "142952878320961461080373012960076024380",
                "229448456093366795252439917047840744618",
                "270873070110245987944929675883864723124"
            ]
        },
        "signature_type": "Line",
        "signature_version": "v1",
        "id": "CVE-2026-53586-5c51d95b",
        "source": "https://github.com/libgit2/libgit2/commit/07de6a7e438f95ac9a6efd3222a82117e871ed27",
        "target": {
            "file": "src/libgit2/transports/http.c"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "233054586897221852713287291746647347337",
            "length": 1529.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-78120b91",
        "source": "https://github.com/libgit2/libgit2/commit/af2b29ad0a74d5bac9751376879ddaf848136d3b",
        "target": {
            "file": "tests/libgit2/online/clone.c",
            "function": "test_online_clone__cleanup"
        },
        "deprecated": false
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "207909918685542922194069116414492615160",
                "197067467139848598089052440033377304406",
                "65681440121537140446997009633710404987",
                "97272094557745585854865076390484422450",
                "208001022395309591442951817173319934324",
                "212069330643619758999620758861947688190",
                "11885606860653938567608852324350465736",
                "99399674368632812525892289471140314689",
                "234187364873800601306647599915623070170",
                "234355497808159258713584416816293600450",
                "306188306624947179506676525626315306546",
                "106192263403950942011794048335960771633",
                "213030130174614358305683339818141234705"
            ]
        },
        "signature_type": "Line",
        "signature_version": "v1",
        "id": "CVE-2026-53586-7d4ada68",
        "source": "https://github.com/libgit2/libgit2/commit/07de6a7e438f95ac9a6efd3222a82117e871ed27",
        "target": {
            "file": "tests/libgit2/online/clone.c"
        },
        "deprecated": false
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "207909918685542922194069116414492615160",
                "197067467139848598089052440033377304406",
                "65681440121537140446997009633710404987",
                "97272094557745585854865076390484422450",
                "208001022395309591442951817173319934324",
                "212069330643619758999620758861947688190",
                "11885606860653938567608852324350465736",
                "99399674368632812525892289471140314689",
                "234187364873800601306647599915623070170",
                "234355497808159258713584416816293600450",
                "306188306624947179506676525626315306546",
                "106192263403950942011794048335960771633",
                "213030130174614358305683339818141234705"
            ]
        },
        "signature_type": "Line",
        "signature_version": "v1",
        "id": "CVE-2026-53586-aa4eb043",
        "source": "https://github.com/libgit2/libgit2/commit/c1507abc44647b3acd832a33a5b1c8c9f5ba8821",
        "target": {
            "file": "tests/libgit2/online/clone.c"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "292090992641920243916529641330655405346",
            "length": 485.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-aca59c2e",
        "source": "https://github.com/libgit2/libgit2/commit/af2b29ad0a74d5bac9751376879ddaf848136d3b",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_proxy_auth"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "264647579742310606301819543959917002906",
            "length": 2388.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-b4f61fea",
        "source": "https://github.com/libgit2/libgit2/commit/af2b29ad0a74d5bac9751376879ddaf848136d3b",
        "target": {
            "file": "tests/libgit2/online/clone.c",
            "function": "test_online_clone__initialize"
        },
        "deprecated": false
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "292894123169329908573221382736719689130",
                "45691261651861175910323428934692818972",
                "219899257416663776281737352721997551642",
                "30471715161870962019297185028303214131",
                "242587518969759694907851457444711161959",
                "70770410110744336111878526066025820786",
                "194940770660331527869366277062606724607",
                "275810513160097991676880721772596738911",
                "78362828072653138263658392132753516808",
                "50138403786554015781826161590171684170",
                "333189531666698533891715896143604570877",
                "134032226687034903566410851966269299282",
                "72560919542960246025669722317294072353",
                "334285288392661952764871398094729519093",
                "193796507953802999933366682774306510472",
                "231452813322631493322072844986568107104",
                "211343763167986509495999619827877561891",
                "140449934440117550191088601710543942578",
                "64011064049084059199643514393210194407",
                "219912261095537977924916121581914830221",
                "51566544700613081438128040857558996849",
                "142952878320961461080373012960076024380",
                "229448456093366795252439917047840744618",
                "270873070110245987944929675883864723124"
            ]
        },
        "signature_type": "Line",
        "signature_version": "v1",
        "id": "CVE-2026-53586-b6d0b224",
        "source": "https://github.com/libgit2/libgit2/commit/af2b29ad0a74d5bac9751376879ddaf848136d3b",
        "target": {
            "file": "src/libgit2/transports/http.c"
        },
        "deprecated": false
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "292894123169329908573221382736719689130",
                "45691261651861175910323428934692818972",
                "219899257416663776281737352721997551642",
                "30471715161870962019297185028303214131",
                "242587518969759694907851457444711161959",
                "70770410110744336111878526066025820786",
                "194940770660331527869366277062606724607",
                "275810513160097991676880721772596738911",
                "78362828072653138263658392132753516808",
                "50138403786554015781826161590171684170",
                "333189531666698533891715896143604570877",
                "134032226687034903566410851966269299282",
                "72560919542960246025669722317294072353",
                "334285288392661952764871398094729519093",
                "193796507953802999933366682774306510472",
                "231452813322631493322072844986568107104",
                "211343763167986509495999619827877561891",
                "140449934440117550191088601710543942578",
                "64011064049084059199643514393210194407",
                "219912261095537977924916121581914830221",
                "51566544700613081438128040857558996849",
                "142952878320961461080373012960076024380",
                "229448456093366795252439917047840744618",
                "270873070110245987944929675883864723124"
            ]
        },
        "signature_type": "Line",
        "signature_version": "v1",
        "id": "CVE-2026-53586-b87693ee",
        "source": "https://github.com/libgit2/libgit2/commit/c1507abc44647b3acd832a33a5b1c8c9f5ba8821",
        "target": {
            "file": "src/libgit2/transports/http.c"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "264647579742310606301819543959917002906",
            "length": 2388.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-ba9114ea",
        "source": "https://github.com/libgit2/libgit2/commit/07de6a7e438f95ac9a6efd3222a82117e871ed27",
        "target": {
            "file": "tests/libgit2/online/clone.c",
            "function": "test_online_clone__initialize"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "21239647138274559075372053953119188355",
            "length": 876.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-c1921f98",
        "source": "https://github.com/libgit2/libgit2/commit/af2b29ad0a74d5bac9751376879ddaf848136d3b",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_auth"
        },
        "deprecated": false
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "207909918685542922194069116414492615160",
                "197067467139848598089052440033377304406",
                "65681440121537140446997009633710404987",
                "97272094557745585854865076390484422450",
                "208001022395309591442951817173319934324",
                "212069330643619758999620758861947688190",
                "11885606860653938567608852324350465736",
                "99399674368632812525892289471140314689",
                "234187364873800601306647599915623070170",
                "234355497808159258713584416816293600450",
                "306188306624947179506676525626315306546",
                "106192263403950942011794048335960771633",
                "213030130174614358305683339818141234705"
            ]
        },
        "signature_type": "Line",
        "signature_version": "v1",
        "id": "CVE-2026-53586-d6d39e08",
        "source": "https://github.com/libgit2/libgit2/commit/af2b29ad0a74d5bac9751376879ddaf848136d3b",
        "target": {
            "file": "tests/libgit2/online/clone.c"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "233054586897221852713287291746647347337",
            "length": 1529.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-fb84acbf",
        "source": "https://github.com/libgit2/libgit2/commit/07de6a7e438f95ac9a6efd3222a82117e871ed27",
        "target": {
            "file": "tests/libgit2/online/clone.c",
            "function": "test_online_clone__cleanup"
        },
        "deprecated": false
    },
    {
        "digest": {
            "function_hash": "21239647138274559075372053953119188355",
            "length": 876.0
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "id": "CVE-2026-53586-fc774637",
        "source": "https://github.com/libgit2/libgit2/commit/c1507abc44647b3acd832a33a5b1c8c9f5ba8821",
        "target": {
            "file": "src/libgit2/transports/http.c",
            "function": "handle_auth"
        },
        "deprecated": false
    }
]
vanir_signatures_modified 
"2026-08-23T10:47:10Z"