CVE-2026-53583
- Source
- https://cve.org/CVERecord?id=CVE-2026-53583
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53583.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-53583
- Aliases
-
- GHSA-h7gc-w2gg-p9xp
- Downstream
- Related
- Published
- 2026-08-20T18:39:03.676Z
- Modified
- 2026-08-22T10:47:45.780470Z
- Severity
-
- 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
- Summary
- libgit2: Inverted IP SubjectAltName Comparison in OpenSSL Backend
- 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, verifyservercert in src/libgit2/streams/openssl.c uses an inverted !!memcmp result in the GEN_IPADD branch when comparing an IP-literal host with a certificate IP SubjectAltName. OpenSSL builds reject matching IP addresses and accept mismatched IP addresses, allowing a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept libgit2 connections to IP-literal HTTPS URLs. DNS SubjectAltName validation and non-OpenSSL TLS backends are not affected. This issue is fixed in versions 1.8.6 and 1.9.5.
- Database specific
{ "cwe_ids": [ "CWE-295", "CWE-297" ], "cna_assigner": "GitHub_M", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53583.json" }- References
-
- https://github.com/libgit2/libgit2/releases/tag/v1.8.6
- https://github.com/libgit2/libgit2/releases/tag/v1.9.5
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53583.json
- https://github.com/libgit2/libgit2/security/advisories/GHSA-h7gc-w2gg-p9xp
- https://nvd.nist.gov/vuln/detail/CVE-2026-53583
- https://github.com/libgit2/libgit2/commit/647dcb432980b84ede4cb5a008bbd1ccb4ead03d
- https://github.com/libgit2/libgit2/commit/c2aa35409ee0e6515df64da49750f13a0a42c47f
- https://github.com/libgit2/libgit2/commit/ef086bc3e4eedf62be38a910381aae24d49871ff
Affected packages
Git / github.com/libgit2/libgit2
Affected ranges
- Type
- GIT
- Repo
- https://github.com/libgit2/libgit2
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedIntroducedFixedFixedFixedFixedFixed
- 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-2026-53583.json"
vanir_signatures
[
{
"digest": {
"threshold": 0.9,
"line_hashes": [
"161163592757564595969332526842759641351",
"211848842349138299922078898038780968212",
"150678553108198291235507343758851396879",
"243595294194876164507250832174148284305",
"260389537651659206423006796518091961514",
"111247752267490302524130105154936124555",
"157166958937368593972319777643047511994",
"14077685195833109481790633948365565836",
"211479020404053345239813664263127410790",
"158673971632547545414188081025559933918",
"236782617318123956231007559998755265225",
"160046562868851252895684686586687525125",
"30857154250935804666614266446734606942",
"154944407122117528254105116676392307560",
"287732400818321933112008560485550651873",
"133646563724366978894573886906506650712"
]
},
"signature_type": "Line",
"signature_version": "v1",
"id": "CVE-2026-53583-559c06d2",
"source": "https://github.com/libgit2/libgit2/commit/ef086bc3e4eedf62be38a910381aae24d49871ff",
"target": {
"file": "src/libgit2/streams/openssl.c"
},
"deprecated": false
},
{
"digest": {
"function_hash": "194443070578024260421714920149812272884",
"length": 2323.0
},
"signature_type": "Function",
"signature_version": "v1",
"id": "CVE-2026-53583-77a13ab1",
"source": "https://github.com/libgit2/libgit2/commit/ef086bc3e4eedf62be38a910381aae24d49871ff",
"target": {
"file": "src/libgit2/streams/openssl.c",
"function": "verify_server_cert"
},
"deprecated": false
},
{
"digest": {
"function_hash": "194443070578024260421714920149812272884",
"length": 2323.0
},
"signature_type": "Function",
"signature_version": "v1",
"id": "CVE-2026-53583-a9d9ed68",
"source": "https://github.com/libgit2/libgit2/commit/c2aa35409ee0e6515df64da49750f13a0a42c47f",
"target": {
"file": "src/libgit2/streams/openssl.c",
"function": "verify_server_cert"
},
"deprecated": false
},
{
"digest": {
"function_hash": "194443070578024260421714920149812272884",
"length": 2323.0
},
"signature_type": "Function",
"signature_version": "v1",
"id": "CVE-2026-53583-b59b2bd1",
"source": "https://github.com/libgit2/libgit2/commit/647dcb432980b84ede4cb5a008bbd1ccb4ead03d",
"target": {
"file": "src/libgit2/streams/openssl.c",
"function": "verify_server_cert"
},
"deprecated": false
},
{
"digest": {
"threshold": 0.9,
"line_hashes": [
"161163592757564595969332526842759641351",
"211848842349138299922078898038780968212",
"150678553108198291235507343758851396879",
"243595294194876164507250832174148284305",
"260389537651659206423006796518091961514",
"111247752267490302524130105154936124555",
"157166958937368593972319777643047511994",
"14077685195833109481790633948365565836",
"211479020404053345239813664263127410790",
"158673971632547545414188081025559933918",
"236782617318123956231007559998755265225",
"160046562868851252895684686586687525125",
"30857154250935804666614266446734606942",
"154944407122117528254105116676392307560",
"287732400818321933112008560485550651873",
"133646563724366978894573886906506650712"
]
},
"signature_type": "Line",
"signature_version": "v1",
"id": "CVE-2026-53583-c2a6ac27",
"source": "https://github.com/libgit2/libgit2/commit/c2aa35409ee0e6515df64da49750f13a0a42c47f",
"target": {
"file": "src/libgit2/streams/openssl.c"
},
"deprecated": false
},
{
"digest": {
"threshold": 0.9,
"line_hashes": [
"161163592757564595969332526842759641351",
"211848842349138299922078898038780968212",
"150678553108198291235507343758851396879",
"243595294194876164507250832174148284305",
"260389537651659206423006796518091961514",
"111247752267490302524130105154936124555",
"157166958937368593972319777643047511994",
"14077685195833109481790633948365565836",
"211479020404053345239813664263127410790",
"158673971632547545414188081025559933918",
"236782617318123956231007559998755265225",
"160046562868851252895684686586687525125",
"30857154250935804666614266446734606942",
"154944407122117528254105116676392307560",
"287732400818321933112008560485550651873",
"133646563724366978894573886906506650712"
]
},
"signature_type": "Line",
"signature_version": "v1",
"id": "CVE-2026-53583-cfe6bfb2",
"source": "https://github.com/libgit2/libgit2/commit/647dcb432980b84ede4cb5a008bbd1ccb4ead03d",
"target": {
"file": "src/libgit2/streams/openssl.c"
},
"deprecated": false
}
]
vanir_signatures_modified
"2026-08-22T10:47:45Z"