5.9

CVE-2025-6491: php_group php NULL Pointer Dereference

CVSS: 5.9v3.1MediumModified
AliasesUBUNTU-CVE-2025-6491DEBIAN-CVE-2025-6491
Published 13-07-2025Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2025-6491 is a medium (CVSS 5.9) NULL Pointer Dereference vulnerability in php_group php. EPSS estimates a 0.99% chance of exploitation in the next 30 days, higher than 61.9% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.99%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 14 · Related 7
DLA-4254-1DSA-5967-1MGASA-2025-0203OPENSUSE-SU-2025:15340-1RHSA-2025:23309RHSA-2026:1409

Timeline

  1. 13-07-2025
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

Description

In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.99%

Chance of exploitation in the next 30 days

Percentile

62%

Versus all other CVEs

30-day change

+0.02 pp

From 0.97% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.99%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Php Src

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Ubuntu7 products
  • php5All versions (No fix recorded)
  • php7.0< 7.0.33-0ubuntu0.16.04.16+esm16
  • php7.2< 7.2.24-0ubuntu0.18.04.17+esm9
  • php7.4< 7.4.3-4ubuntu2.29+esm1
  • php8.1< 8.1.2-1ubuntu2.22
Debian2 products
  • php8.2< 8.2.29-1~deb12u1
  • php8.4< 8.4.10-1
Php1 product
  • php≥ 8.1.0, < 8.1.33 | ≥ 8.2.0, < 8.2.29 | ≥ 8.3.0, < 8.3.23 | ≥ 8.4.0, < 8.4.10
Php_group1 product
  • php≥ 8.1.*, < 8.1.33 | ≥ 8.2.*, < 8.2.29 | ≥ 8.3.*, < 8.3.23 | ≥ 8.4.*, < 8.4.10

4 vendors · 11 products

References

9 links