CVE-2025-6491
NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix
5.9
MEDIUM
CVSS 3.1
EPSS 0.77%
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.
How to fix CVE-2025-6491
To remediate CVE-2025-6491, upgrade the affected package to a fixed version below.
- —upgrade to 8.1.33 or later
- —upgrade to 8.1.33 or later
- —upgrade to 8.1.33 or later
- —upgrade to 7.4.33-1+deb11u9 or later
- —upgrade to 8.2.29-1~deb12u1 or later
- —upgrade to 8.4.10-1 or later
Is CVE-2025-6491 being exploited?
Low — EPSS is 0.8%, meaning exploitation activity has not been observed at scale.
Affected packages (6)
- from 0, < 8.1.33, >= 8.2.0, < 8.2.29, >= 8.3.0, < 8.3.23, >= 8.4.0, < 8.4.10
- from 0, < 8.1.33, >= 8.2.0, < 8.2.29, >= 8.3.0, < 8.3.23, >= 8.4.0, < 8.4.10
- from 0, < 8.1.33, >= 8.2.0, < 8.2.29, >= 8.3.0, < 8.3.23, >= 8.4.0, < 8.4.10
- from 0, < 7.4.33-1+deb11u9
- from 0, < 8.2.29-1~deb12u1
- from 0, < 8.4.10-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |