CVE-2026-112399
highPillow is a Python imaging library.
Vendor / product: Python — pillow
Pillow is a Python imaging library. From 8.1.0 until 13.0.0, Pillow can allocate an APNG disposal background at the full canvas size before applying the decompression-bomb check. A crafted APNG with a small first frame, a very large declared canvas, and background disposal or first-frame OP_PREVIOUS reaches PngImageFile._seek while Image.open() positions frame zero. The full-canvas allocation occurs inside Image.open() without requiring pixel loading or frame iteration. This can exhaust memory and deny service. This issue is fixed in version 13.0.0.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-10-19 22:17
Modified: 2026-10-28 16:17
NVD status: Modified
Last synced 12 hours ago
Verified against the source API 2026-10-28 16:34 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
python / pillow ≥8.1.0 <13.0.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48
Patch / mitigation: https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9
Patch / mitigation: https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9
References
- https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48 security-advisories@github.com
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 security-advisories@github.com
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9 security-advisories@github.com
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-28 16:34 UTC · record ↗