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

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.

Published: 2025-06-16 Last update: 2026-06-02 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-49795 is rated Moderate Risk (56.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.83%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-49795

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-20 0.56% 0.83% +0.28%
2 2026-04-12 0.15% 0.56% +0.40%
3 2026-01-29 — 0.15% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-49795

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2025-49795

GitHub Security Advisory for CVE-2025-49795

GHSA-gg7j-w83p-fxr9 · Severity: high — A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML...

OS Trackers for CVE-2025-49795

vendor priority summary link
alpine — CVE-2025-49795: 1 source package rows (libxml2); 4 state rows across 4 repos (3.21-main, 3.22-main, 3.23-main, edge-main); fixed 4, open 0. https://security.alpinelinux.org/vuln/CVE-2025-49795
debian unimportant CVE-2025-49795 unimportant priority: Debian including 1 source packages (libxml2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-49795
redhat high — https://access.redhat.com/security/cve/CVE-2025-49795
suse high CVE-2025-49795 severity important: SUSE including 322 source package names (0.23.1-11.20:libxml2-2-2.10.3-150500.5.29.1, 0.3.2-1.2:libxml2-2-2.10.3-150500.5.29.1, …), 885 product×package rows across 279 product lines (Container bci/kiwi, Container bci/spack, … (279 product lines)): Fixed 488, Known Affected 231, Known Not Affected 166. https://www.suse.com/security/cve/CVE-2025-49795/
ubuntu medium CVE-2025-49795 medium priority: Ubuntu including 1 source packages (libxml2), 10 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 7, ignored 1, needs-triage 1, released 1. https://ubuntu.com/security/CVE-2025-49795

Affected software / configurations for CVE-2025-49795

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-49795

cvelogic Threat Intelligence