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CVE-2026-86139
medium
CVSS 6.9
In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.
Summary
In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.
AI summary snake-internal / snake-template-v1
A weakness called CVE-2026-86139 was discovered in In libxml2 before.
Severity is Medium (CVSS 6.9/10). Exploitation requires specific conditions but can cause real harm if successful.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "In libxml2 before CVE-2026-86139".
CVE-2026-86139 (In libxml2 before). Severity: Medium / CVSSv3 6.9. Category: CWE-190.
Response plan:
1. Check the vendor advisory for affected versions and the patched release.
2. If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
3. If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
4. Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
❓ What is the problem
A weakness (CVE-2026-86139) in In libxml2 before. A serious software flaw has been identified.
📍 Affected scope
Target versions of In libxml2 before (see vendor advisory). If running in production, identify exposure immediately.
🔥 Severity
Severity: Medium (CVSS 6.9/10). Exploitation requires specific conditions but can cause real harm if successful.
🔧 How to fix
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-190)
🛡️ Workaround
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
🔍 Detection
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.
References
- web cve@mitre.org
- web cve@mitre.org