CVE-2026-56408

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Source
https://cve.org/CVERecord?id=CVE-2026-56408
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-56408.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-56408
Downstream
Related
Published
2026-06-21T15:51:11.303Z
Modified
2026-07-14T20:06:32.968013Z
Severity
  • 6.9 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L CVSS Calculator
Summary
[none]
Details

libexpat before 2.8.2 has an integer overflow in copyString.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56408.json",
    "cna_assigner": "mitre",
    "cwe_ids": [
        "CWE-190"
    ]
}
References

Affected packages

Git / github.com/libexpat/libexpat

Affected ranges

Type
GIT
Repo
https://github.com/libexpat/libexpat
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c61098da494eea1cbd091118118dcee417faacea
Fixed
16e2efd867ea8567ffa012210b52ef5918e20817
Database specific 
{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.8.2"
        }
    ],
    "cpe": "cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*"
}

Affected versions

Other
REC1_0
R_1_95_0
R_1_95_2
R_1_95_3
R_1_95_4
R_1_95_5
R_1_95_6
R_1_95_7
R_1_95_8
R_2_0_0
R_2_0_1
R_2_1_0
R_2_1_1
R_2_2_0
R_2_2_1
R_2_2_10
R_2_2_2
R_2_2_3
R_2_2_4
R_2_2_5
R_2_2_6
R_2_2_7
R_2_2_8
R_2_2_9
R_2_3_0
R_2_4_0
R_2_4_1
R_2_4_2
R_2_4_3
R_2_4_4
R_2_4_5
R_2_4_6
R_2_4_7
R_2_4_8
R_2_4_9
R_2_5_0
R_2_6_0
R_2_6_1
R_2_6_2
R_2_6_3
R_2_6_4
R_2_7_0
R_2_7_1
R_2_7_2
R_2_7_3
R_2_7_4
R_2_7_5
R_2_8_0
R_2_8_1
V1990307
V19981122
V19981231
V19990109
V19990425
V19990626
V19990709
V19990728
V19991013
V1_0
V1_1
V20000512
beta2
beta3
beta4
jclark-orig
libexpat-alpha-1
sourceforge_init
start

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-56408.json"
vanir_signatures_modified 
"2026-07-14T20:06:32Z"
vanir_signatures 
[
    {
        "source": "https://github.com/libexpat/libexpat/commit/16e2efd867ea8567ffa012210b52ef5918e20817",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "49764371326105024949167023033929323404",
                "331886275670177522007581575306208215313",
                "47859046433447248635562634368972807069"
            ]
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2026-56408-49af9273",
        "target": {
            "file": "expat/lib/xmlparse.c"
        },
        "signature_type": "Line"
    },
    {
        "source": "https://github.com/libexpat/libexpat/commit/16e2efd867ea8567ffa012210b52ef5918e20817",
        "digest": {
            "length": 276.0,
            "function_hash": "304819910357209817028662367993368572534"
        },
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2026-56408-bb252a66",
        "target": {
            "function": "copyString",
            "file": "expat/lib/xmlparse.c"
        },
        "signature_type": "Function"
    }
]