Out-of-Bounds Read in Struktur (CVE-2026-47251)
Summary
Vulnerability in Struktur (CVE-2026-47251). Risk of unauthorized operations or information disclosure. Exploitable via b97c8b5.
Original description
The description as published by the source.
libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit b97c8b5, PR #1712) introduced an integer overflow in the very security check it added. The check itself can be bypassed, allowing a crafted HEIF file with a VVC track to trigger the same out-of-bounds heap read that CVE-2026-3949 was meant to prevent. This is a separate, currently-unpatched vulnerability. Issue #1712 was closed as fixed without testing the edge case where size is near UINT32_MAX. Version 1.22.0 patches the issue.
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-2026-47251 has been found in Struktur.
Attackers can target a specific entry point like b97c8b5 over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Struktur CVE-2026-47251" on the vendor's site.
CVE-2026-47251 (Struktur) — CWE-125 / CVSS v3 6.1
Attack vector: local / unauthenticated
Attack surface: b97c8b5 / size / UINT32_MAX
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.
Out-of-bounds read (CWE-125) exists in Struktur. Attackers reach the vulnerable code path via b97c8b5 without authentication.
Check the vendor advisory for the affected versions of Struktur. Attack surface: b97c8b5 / size / UINT32_MAX.
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
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 'Struktur' . 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
-
1Identify exposure identify
grep -r 'Struktur' . | 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
Strukturを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-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。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-47251 libheif Fixed in: 1.22.2-r0
- Debian DEBIAN-CVE-2026-47251 libheif
- Ubuntu UBUNTU-CVE-2026-47251 libheif
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- report github.com