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CVE-2026-42310
medium
CVSS 5.5
Vulnerability in pillow (CVE-2026-42310)
Summary
vulnerability in pillow (CVE-2026-42310). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `12.2.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-42310** has been found in pillow.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: upgrade pillow to **12.2.0** or later.
If unsure, ask your IT team or search "pillow CVE-2026-42310" on the vendor's site.
CVE-2026-42310 (pillow) — CWE-835 / CVSS v3 5.5
Attack vector: local / no user interaction
Patched: `12.2.0` — apply immediately
Workaround: Use any version but the affected versions: >= 4.2.0, < 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-835) exists in pillow.
📍 Affected scope
pillow — .
🔥 Severity
Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **12.2.0**.
🛡️ Workaround
Workaround: Use any version but the affected versions: >= 4.2.0, < 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 (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify 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。
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5Apply temporary workaround mitigate
Use any version but the affected versions: >= 4.2.0, < 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 the affected versions: >= 4.2.0, < 12.2.0 を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
Bitnami
pillow
[{"type":"SEMVER","events":[{"introduced":"4.2.0"},{"fixed":"12.2.0"}]}]
PyPI
pillow
[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.0"},{"fixed":"12.2.0"}]}]
pip
pillow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"12.2.0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-42310
- package https://github.com/python-pillow/Pillow
- web https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468
- web https://github.com/python-pillow/Pillow/pull/9519
- web https://github.com/python-pillow/Pillow/releases/tag/12.2.0
- web https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7
- web https://github.com/advisories/GHSA-r73j-pqj5-w3x7