CVE-2026-11979: Stack-Based Buffer Overflow in libxml2

unknownCVE-2026-11979

CSIRTS triage

Other

What: Stack-based buffer overflow in libxml2.
Who is affected: Users of libxml2 are affected.
Urgency: Remediation is unknown due to lack of severity information.
Action: Monitor for updates regarding this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-11979

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-119790.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-11979	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-11979: libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when …nvd

Recent advisories for Stack-Based Buffer Overflow

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-51605: A stack-based buffer overflow vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V3…nvd · 2026-07-09
highCVE-2026-51604: A stack-based buffer overflow vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V3…nvd · 2026-07-09
highCVE-2026-51603: A stack-based buffer overflow vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V3…nvd · 2026-07-09
highCVE-2026-51602: A stack-based buffer overflow vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V3…nvd · 2026-07-09
highCVE-2026-51601: Tenda CP3 V3.0 firmware V31.1.9.91 contains a stack-based buffer overflow in the RTSP service.…nvd · 2026-07-09
mediumCVE-2026-58303: Stack-based buffer overflow vulnerability in Samsung Open Source Escargot allows Overflow Buff…nvd · 2026-07-09