USN-8687-1: p11-kit vulnerabilities
It was discovered that p11-kit incorrectly handled certain RPC messages. A local attacker could use this issue to cause p11-kit to crash, resulting in a denial of service. (CVE-2026-13757) It was discovered that p11-kit incorrectly handled nested attribute decoding on 32-bit systems. A local attacker could use this issue to cause p11-kit to crash, resulting in a denial of service. (CVE-2026-18938)
CSIRTS triage
- What
- p11-kit incorrectly handles RPC messages and nested attribute decoding on 32-bit systems, causing crashes.
- Who is affected
- Systems running p11-kit, particularly 32-bit deployments processing RPC messages.
- Urgency
- Fix to prevent denial of service and potential information disclosure via crash.
- Action
- Update p11-kit to a patched version addressing CVE-2026-13757 and CVE-2026-18938.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://ubuntu.com/security/notices/USN-8687-1
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-2026-137570.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-189380.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-13757 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-18938 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[UPDATE] [mittel] Red Hat Enterprise Linux (p11-kit): Schwachstelle ermöglicht Denial of Servicecert-bund
- unknownMultiples vulnérabilités dans les produits VMware (07 septembre 2026)cert-fr-avis
- mediumCVE-2026-18938: A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RP…nvd
- mediumCVE-2026-13757: A flaw was found in p11-kit. The RPC message attribute parsing functions p11_rpc_message_get_a…nvd
- mediumCVE-2026-13757: P11-kit: stack exhaustion via unbounded recursion in rpc attribute parsingmsrc
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