CVE-2025-10911: Libxslt: use-after-free with key data stored cross-rvt

mediumCVSS 5.5CVE-2025-10911

CSIRTS triage

vendor: libxslt product: libxslt Memory corruption

What: A use-after-free vulnerability occurs with key data stored across result value trees (cross-rvt).
Who is affected: Applications using libxslt to process untrusted XSLT stylesheets with key functions are affected.
Urgency: Remediation is routine; CVSS 5.5 is moderate and no active exploitation reported.
Action: Upgrade libxslt to a patched version that eliminates the use-after-free with cross-rvt key data.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-10911

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-2025-109110.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-10911	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 Libxslt

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.

medium[UPDATE] [mittel] Red Hat Enterprise Linux (libxslt): Schwachstelle ermöglicht Codeausführungcert-bund · 2026-09-04
medium[UPDATE] [medium] Red Hat Hardened Images RPMs (libxslt): Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-09-02
highCVE-2025-71406: Nokogiri before 1.18.4 bundles a vulnerable version of libxslt (prior to 1.1.43) that contains…nvd · 2026-08-25
criticalCVE-2022-51000: Nokogiri before 1.13.2 (CRuby, when using packaged libraries) ships vendored libxml2 2.9.12 an…nvd · 2026-08-25