High severity · published May 10, 2026
CVE-2026-7263
DoS attack via DOMNode::C14N()
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, DOMNode::C14N() method may process the XML data incorrectly, causing a circular linked list in the data structure representing the XML document. This may cause subsequent processing of the XML document to enter infinite loop, causing denial of service in the processing application.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PH
PHP · PHP
8.4.* before 8.4.21; 8.5.* before 8.5.6 · source: vendor, NVD
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-7263
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-7263
Vendor Advisory
https://github.com/php/php-src/security/advisories/GHSA-4jhr-8w89-j733
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:22649
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-7263
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2468572
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7263.json
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