Vulnerability in Libexpat Project (CVE-2026-25210)
Summary
Vulnerability in Libexpat Project (CVE-2026-25210). Confidential information can be exposed externally.
Original description
The description as published by the source.
In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.
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-2026-25210 has been found in Libexpat Project.
Confidential information can be exposed externally. CVSS score: 6.9/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Libexpat Project CVE-2026-25210" on the vendor's site.
CVE-2026-25210 (Libexpat Project) — CWE-190 / CVSS v3 6.9
Attack vector: local / unauthenticated / no user interaction
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 Libexpat Project.
Check the vendor advisory for the affected versions of Libexpat Project.
Severity: Medium (CVSS 6.9/10). Confidential information can be exposed externally.
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. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Libexpat Project を使っているサービスとバージョンを洗い出す。
-
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
- Alpine Linux ALPINE-CVE-2026-25210 expat Fixed in: 2.7.4-r0
- Debian DEBIAN-CVE-2026-25210 expat
- Ubuntu UBUNTU-CVE-2026-25210 coin3
References
- web github.com
- web github.com
- web cert-portal.siemens.com
- web nvd.nist.gov
- web github.com