# CVE-2025-49795: Libxml: null pointer dereference leads to denial of service (dos)

Status: published. Published: 2025-06-16. Updated: 2026-11-04.

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.

## Remediation

- workaround: Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability. (source: CNA: redhat)

## Affected products and versions

- GNOME / libxml2: ≥ 2.10.0; < 2.14.5 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (libxml2): ≥ 0:2.12.5-7.el10_0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Core Services 2.4.62.SP2 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Hardened Images (libxml2-main): ≥ 2.15.2-0.3.hum1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (libxml2): Version range not reported. Source: CNA: redhat
- Siemens / RUGGEDCOM RST2428P: ≥ 0; < V4.0 (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.59% as of 2026-11-04; percentile 48.40%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-825

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2025:10630 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:19020 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:7519 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-49795 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2372379 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.gnome.org/GNOME/libxml2/-/issues/932 (CNA: redhat)

- https://cert-portal.siemens.com/productcert/html/ssa-253495.html (ADP: siemens-SADP)

- https://access.redhat.com/errata/RHSA-2025:10630 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:19020 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:7519 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-49795 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2372379 (secalert@redhat.com)

- https://gitlab.gnome.org/GNOME/libxml2/-/issues/932 (secalert@redhat.com)

- https://cert-portal.siemens.com/productcert/html/ssa-253495.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-49795; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-49795; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-49795; retrieved 2026-11-04; source updated Not reported

Revision: 640cdc015bfcb276ca1f74136cd33050d59949bc4dd8f24b08b8c0892065171d

Canonical: https://y2.dev/cve/CVE-2025-49795

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