CVE-2026-112939

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Source
https://cve.org/CVERecord?id=CVE-2026-112939
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112939.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-112939
Aliases
  • GHSA-rfpc-qcw5-3pc4
Downstream
Published
2026-10-20T14:38:52Z
Modified
2026-10-22T02:49:06Z
Severity
  • 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
filelock: SoftFileLock removes a live holder's marker when another user forges the PID in a writable marker
Details

filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can trust a forged process identifier in a marker that an attacker can modify but cannot remove, allowing an authorized contender such as another process of the holder's account or root to act as a confused deputy, remove the live marker, and admit another holder. This issue is fixed in version 4.2.1.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-345"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112939.json"
}
References

Affected packages

Git / github.com/tox-dev/filelock

Affected ranges

Type
GIT
Repo
https://github.com/tox-dev/filelock
Events
Introduced
1dd2465cef7e5c189feaa16698a3ec3f33a653b0
Fixed
60331bb89f325020b48bc51bde904c6446384e4a
Fixed
eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "3.22.0"
                },
                {
                    "fixed":  "4.2.1"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "4.2.1",
            "range":  [
                {
                    "fixed":  "60331bb89f325020b48bc51bde904c6446384e4a"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

3.*
3.22.0
3.23.0
3.24.0
3.24.1
3.24.2
3.24.3
3.24.4
3.25.0
3.25.1
3.25.2
3.26.0
3.26.1
3.27.0
3.28.0
3.29.0
3.29.1
3.29.2
3.29.3
3.29.4
3.29.5
3.29.6
3.29.7
3.30.0
3.30.1
3.30.2
3.30.3
3.31.0
3.31.1
3.31.2
3.32.0
3.32.1
3.32.2
3.32.3
3.32.4
3.32.5
3.32.6
3.32.7
4.*
4.0.0
4.0.1
4.0.10
4.0.11
4.0.12
4.0.2
4.0.3
4.0.4
4.0.5
4.0.6
4.0.7
4.0.8
4.0.9
4.1.0
4.1.1
4.1.2
4.2.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112939.json"