[UPDATE] [medium] libxml2: Vulnerability allows denial of service
A remote, anonymous attacker can exploit a vulnerability in libxml2 to conduct a denial of service attack.
CSIRTS triage
- What
- A vulnerability allows a remote, anonymous attacker to conduct a denial of service attack.
- Who is affected
- Deployments of libxml2 are affected.
- Urgency
- Remediation is medium urgency as exploitation is possible but not currently active.
- Action
- Update to the latest version of libxml2.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2037
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-2026-66530.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-6653 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for libxml2
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.
- low[UPDATE] [low] libxml2: Vulnerability allows Denial of Servicecert-bund · 2026-07-09
- medium[UPDATE] [medium] libxml2: Vulnerability allows information disclosurecert-bund · 2026-07-08
- medium[UPDATE] [medium] libxml2 (exsltDynMapFunction): Vulnerability allows denial of servicecert-bund · 2026-07-02
- highCVE-2026-11979: libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when …nvd · 2026-06-29
- unknownCVE-2026-11979: Stack-Based Buffer Overflow in libxml2msrc · 2026-06-09
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