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CVE-2026-33416
Use-After-Free in CVE-2026-33416 (CVE-2026-33416)
Summary
vulnerability in CVE-2026-33416 (CVE-2026-33416). Successful exploitation can lead to full system takeover. Exploitable via ``png_set_tRNS``.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-33416** has been found in CVE-2026-33416.
Attackers can target a specific entry point like ``png_set_tRNS`` over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: ?/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-33416 CVE-2026-33416" on the vendor's site.
CVE-2026-33416 (CVE-2026-33416) — CWE-416 /
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: `png_set_tRNS` / `png_set_PLTE` / `png_struct` / `png_info`
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
**use-after-free** (CWE-416) exists in CVE-2026-33416. Attackers reach the vulnerable code path via ``png_set_tRNS`` without authentication.
📍 Affected scope
CVE-2026-33416 — . Attack surface: `png_set_tRNS` / `png_set_PLTE` / `png_struct` / `png_info`.
🔥 Severity
Severity: ?. Successful exploitation can lead to full system takeover
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.依存マニフェストで影響コンポーネントを特定する。
-
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。
References
- advisory https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33416.json
- advisory https://github.com/pnggroup/libpng/security/advisories/GHSA-m4pc-p4q3-4c7j
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-33416
- patch https://github.com/pnggroup/libpng/commit/23019269764e35ed8458e517f1897bd3c54820eb
- patch https://github.com/pnggroup/libpng/commit/7ea9eea884a2328cc7fdcb3c0c00246a50d90667
- patch https://github.com/pnggroup/libpng/commit/a3a21443ed12bfa1ef46fa0d4fb2b74a0fa34a25
- patch https://github.com/pnggroup/libpng/commit/c1b0318b393c90679e6fa5bc1d329fd5d5012ec1
- patch https://github.com/pnggroup/libpng/pull/824