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  4. CVE 2026 42311 pillow has an oob write with invalid psd tile
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-42311GHSA-PWV6-VV43-88GR

Pillow has an OOB Write with Invalid PSD Tile Extents (Integer Overflow)CVE-2026-42311

Answer in brief

CVE-2026-42311 records a Unknown severity vulnerability in Pillow has an OOB Write with Invalid PSD Tile Extents (Integer Overflow). The current sources do not mark it as known exploited. The current feed maps pillow (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 4, 2026Updated Sep 10, 2026Source checked Oct 26, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026
Upstream Advisory

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
Not reported
Source
OSV
Source checked
Oct 26, 2026
References
7 linked sources
Open source record

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps pillow (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
pillowpypi>=10.3.0 <12.2.012.2.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for pillow.
  2. 2Review the reported fix. Update pillow to 12.2.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 4, 2026

    Evidence: source:osv:source_dates:source-dates:record

  2. Source modified

    Sep 10, 2026

    Evidence: source:osv:source_dates:source-dates:record

  3. First seen by HOL

    Sep 10, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
Upstream source description

### Impact Processing a malicious PSD file could lead to memory corruption, potentially resulting in a crash or arbitrary code execution. ### Patches Patched version: 12.2.0 Pillow 12.1.1 addressed CVE-2026-25990 by adding checks for tile extents in PSD image decoding/encoding to prevent an out-of-bounds write. However, the bounds checks computed tile extent sums using types susceptible to integer overflow, meaning a PSD image with carefully chosen tile dimensions could produce values that wrap around and bypass the checks, still triggering an out-of-bounds write in src/decode.c and src/encode.c. The fix avoids adding extents together before comparison. ### Workarounds Use any version but affected versions: >= 10.3.0, < 12.2.0 ### Resources - Fix: https://github.com/python-pillow/Pillow/pull/9520 - Original issue: CVE-2026-25990 (Pillow 12.1.1)

Quoted source text, attributed separately from HOL analysis.