GHSA-pwv6-vv43-88gr
GHSA-pwv6-vv43-88gr is a CWE-190 vulnerability in pillow. O3 Security confirms whether GHSA-pwv6-vv43-88gr is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Pillow has an OOB Write with Invalid PSD Tile Extents (Integer Overflow)
Blast Radius
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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)
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | pillow | ≥ 10.3.0&&< 12.2.0 | 12.2.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pillow. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update pillow to 12.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pwv6-vv43-88gr is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-pwv6-vv43-88gr is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-pwv6-vv43-88gr. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-pwv6-vv43-88gr in your dependencies?
O3 detects GHSA-pwv6-vv43-88gr across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.