CVE-2026-34085

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Source
https://cve.org/CVERecord?id=CVE-2026-34085
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34085.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-34085
Downstream
Published
2026-03-25T16:54:37.187Z
Modified
2026-08-12T15:33:37.946900Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
Summary
[none]
Details

fontconfig before 2.17.1 has an off-by-one error in allocation during sfnt capability handling, leading to a one-byte out-of-bounds write, and potentially a crash or code execution. This is in FcFontCapabilities in fcfreetype.c.

Database specific 
{
    "cna_assigner": "mitre",
    "cwe_ids": [
        "CWE-193"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34085.json"
}
References

Affected packages

Git / gitlab.freedesktop.org/fontconfig/fontconfig

Affected ranges

Type
GIT
Repo
https://gitlab.freedesktop.org/fontconfig/fontconfig
Events
Introduced
a7a03d6ce093042d1ad4c5cf68746f44b03d8bda
Fixed
b9bec06d73340f1b5727302d13ac3df307b7febc
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.17.0"
        },
        {
            "last_affected": "2.17.0"
        }
    ],
    "source": [
        "CPE_STRING",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:fontconfig_project:fontconfig:2.17.0:*:*:*:*:*:*:*"
}

Affected versions

2.*
2.17.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34085.json"
vanir_signatures 
[
    {
        "target": {
            "file": "src/fcfreetype.c"
        },
        "deprecated": false,
        "source": "https://gitlab.freedesktop.org/fontconfig/fontconfig@b9bec06d73340f1b5727302d13ac3df307b7febc",
        "id": "CVE-2026-34085-45ef1721",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "338340049756908944638127367645014270671",
                "268265478117448297596468193855047314435",
                "225805937722339647865978530876903344264",
                "214071455402570792325521226127506101614"
            ]
        },
        "signature_type": "Line"
    },
    {
        "target": {
            "function": "FcFontCapabilities",
            "file": "src/fcfreetype.c"
        },
        "deprecated": false,
        "source": "https://gitlab.freedesktop.org/fontconfig/fontconfig@b9bec06d73340f1b5727302d13ac3df307b7febc",
        "id": "CVE-2026-34085-91fe36e2",
        "signature_version": "v1",
        "digest": {
            "length": 1198.0,
            "function_hash": "167811288294678018177566407554085947143"
        },
        "signature_type": "Function"
    }
]
vanir_signatures_modified 
"2026-08-12T15:33:37Z"