Vulnerability in pillow (CVE-2026-42308)
Summary
Vulnerability in pillow (CVE-2026-42308). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 12.2.0 or later.
Original description
The description as published by the source.
Pillow is a Python imaging library. Prior to version 12.2.0, if a font advances for each glyph by an exceeding large amount, when Pillow keeps track of the current position, it may lead to an integer overflow. This issue has been patched in version 12.2.0.
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-2026-42308 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-2026-42308" on the vendor's site.
CVE-2026-42308 (pillow) — CWE-190 / CVSS v3 5.5
Attack vector: local / no user interaction
Patched: 12.2.0 — apply immediately
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.
A vulnerability (CWE-190) exists in pillow.
Check the vendor advisory for the affected versions of pillow.
Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure.
Update to 12.2.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
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
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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。 -
2Apply 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。
-
3Post-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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-42308 pillow
- Ubuntu UBUNTU-CVE-2026-42308 pillow
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- web github.com
- web github.com
- web github.com