CVE-2025-6491

CWE-476 — NULL Pointer Dereference9 documents7 sources
Severity
5.9MEDIUM
EPSS
0.3%
top 51.43%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
PHP Group PHPPHP PHP
Timeline
PublishedJul 13
Latest updateAug 21

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 vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 2.2 | Impact: 3.6

Affected Packages5 packages

▶NVDphp/php8.1.0 — 8.1.33+3
▶CVEListV5php_group/php8.1.* — 8.1.33+3
▶Debianphp7.4< 7.4.33-1+deb11u9
▶Debianphp8.2< 8.2.29-1~deb12u1
▶Debianphp8.4< 8.4.10-1+1

🔴Vulnerability Details

3
OSV
php8.1, php8.3, php8.4 vulnerabilities↗2025-07-17
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OSV
CVE-2025-6491: In PHP versions:8↗2025-07-13
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CVEList
NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix↗2025-07-13
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📋Vendor Advisories

5
Ubuntu
PHP vulnerabilities↗2025-08-21
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Ubuntu
PHP vulnerabilities↗2025-07-17
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Microsoft
NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix↗2025-07-08
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Red Hat
php: NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix↗2025-07-05
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Debian
CVE-2025-6491: php7.4 - In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8...↗2025
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