[UPDATE] [medium] expat: Vulnerability enables code execution
A local attacker can exploit a vulnerability in expat to trigger an integer overflow that enables further attacks, including code execution, information disclosure, memory corruption, and denial-of-service.
CSIRTS triage
- What
- An integer overflow vulnerability in Expat enables code execution, memory corruption, information disclosure, and denial of service.
- Who is affected
- Local attackers on systems running vulnerable Expat library versions.
- Urgency
- Medium severity; integer overflow is exploitable for code execution but not yet confirmed exploited.
- Action
- Update Expat to a patched version.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch Expat
Get an email when a new Expat advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0265
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-2026-252100.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-25210 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] Dell PowerScale OneFS: Multiple Vulnerabilitiescert-bund
- unknownDSA-6404-1 expat - security updatedebian
- high[NEW] [high] Dell integrated Dell Remote Access Controller: Multiple vulnerabilitiescert-bund
- criticalSiemens SINEC OScisa
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 enables denial of servicecert-bund · 2026-09-04
- medium[UPDATE] [medium] expat: Multiple vulnerabilitiescert-bund · 2026-09-01
- medium[NEW] [medium] expat: Vulnerability enables denial of servicecert-bund · 2026-08-28
- medium[NEW] [medium] expat: Vulnerability allows unspecified attackcert-bund · 2026-08-28
- low[UPDATE] [low] expat: Vulnerability allows Denial of Servicecert-bund · 2026-08-24
- medium[NEW] [medium] expat: Vulnerability enables denial of servicecert-bund · 2026-08-24
More from CERT-Bund (BSI) Security Advisories
- medium[NEW] [medium] Langflow: Multiple vulnerabilities2026-09-04
- medium[NEW] [medium] Grafana Enterprise: Multiple vulnerabilities allow gaining user or administrator privileges2026-09-04
- low[NEW] [low] Checkmk: Vulnerability allows Denial of Service2026-09-04
- low[NEW] [low] ImageMagick: Multiple vulnerabilities allow Denial of Service2026-09-04
- critical[NEW] [critical] vm2: Multiple vulnerabilities allow code execution2026-09-04