[UPDATE] [medium] expat: Multiple vulnerabilities
A local attacker can exploit multiple vulnerabilities in expat to conduct a denial of service attack or potentially execute code.
CSIRTS triage
- What
- Multiple vulnerabilities can be exploited by a local attacker to conduct a denial of service attack or potentially execute code.
- Who is affected
- Deployments of expat are affected.
- Urgency
- Remediation is medium urgency as exploitation is possible but not currently active.
- Action
- Update to the latest version of expat.
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-2026-2008
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-2026-561310.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
- Low exploitation riskCVE-2026-561320.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56131 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-56132 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for expat
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] expat: Vulnerability allows Denial of Servicecert-bund · 2026-07-10
- unknownUSN-8520-1: Expat vulnerabilityubuntu · 2026-07-09
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