High [CVE-2025-49795] Libxml: null pointer dereference leads to denial of service (dos)
This high-severity Red Hat Linux advisory covers CVE-2025-49795 affecting Red Hat Enterprise Linux 10, Red Hat Hardened Images, Red Hat Enterprise Linux 6.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML expressions. This flaw allows an attacker to craft a malicious XML input to libxml2, leading to a denial of service.
This vulnerability marked as Important rather than Moderate due to its triggerability through untrusted input and impact on availability in a widely-used XML processing library like libxml2, which is often embedded in system-level and server-side applications.
Although it is "just" a NULL pointer dereference—typically classified as a DoS—the context significantly elevates its severity. libxml2 frequently operates in environments that parse external XML content, such as web services, security scanners, and document processors.
A crafted XML exploiting malformed XPath in Schematron schemas can reliably crash the application without requiring special privileges or user interaction. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Hardened Images; Red Hat Enterprise Linux 6.
Red Hat lists Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat fixing advisory: RHSA-2025:10630, RHSA-2026:7519.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- libxml2-0:2.12.5-7.el10_0
- libxml2-main-2.15.2-0.3.hum1
- RHSA-2025:10630
- RHSA-2026:7519
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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