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CVE-2026-42311 high CVSS 7.8

Vulnerability in pillow (CVE-2026-42311)

Summary

Vulnerability in pillow (CVE-2026-42311). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 12.2.0 or later.

Original description

The description as published by the source.

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

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-42311 has been found in pillow.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: upgrade pillow to 12.2.0 or later.
If unsure, ask your IT team or search "pillow CVE-2026-42311" on the vendor's site.

CVE-2026-42311 (pillow) — CWE-190 / CVSS v3 7.8
Attack vector: local / unauthenticated
Patched: 12.2.0 — apply immediately
Workaround: Use any version but affected versions: >= 10.3.0, < 12.2.0
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-190) exists in pillow.

📍 Affected scope

Check the vendor advisory for the affected versions of pillow.

🔥 Severity

Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 12.2.0.

🛡️ Workaround

Workaround: Use any version but affected versions: >= 10.3.0, < 12.2.0

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'pillow' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'pillow' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で pillow を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply temporary workaround mitigate 
    Use any version but affected versions: >= 10.3.0, < 12.2.0

    パッチが適用されるまでの応急処置として、Use any version but affected versions: >= 10.3.0, < 12.2.0 を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 3
    Apply patch patch 
    Upgrade pillow to 12.2.0

    ステージング環境で 12.2.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  4. 4
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

PyPI pillow
[{"type":"ECOSYSTEM","events":[{"introduced":"10.3.0"},{"fixed":"12.2.0"}]}]
Bitnami pillow
[{"type":"SEMVER","events":[{"introduced":"10.3.0"},{"fixed":"12.2.0"}]}]
pip pillow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"12.2.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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