How severe is CVE-2026-7263?

CVE-2026-7263 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-7263 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-7263?

CVE-2026-7263 affects Php. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-7263?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-7263 have an EU (EUVD) identifier?

Yes. CVE-2026-7263 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28981.

When was CVE-2026-7263 published?

CVE-2026-7263 was published on 2026-05-10 and last updated on 2026-06-30.

CVE-2026-7263

CVE-2026-7263 is a high-severity vulnerability in Php with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-404.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 6.3
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28981
Weakness: CWE-404
Affected product: Php
Published: 2026-05-10
Last modified: 2026-06-30

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.

Frequently asked questions

What is CVE-2026-7263?: 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.
How severe is CVE-2026-7263?: CVE-2026-7263 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-7263 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-7263?: CVE-2026-7263 affects Php. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-7263?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-7263 have an EU (EUVD) identifier?: Yes. CVE-2026-7263 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28981.
When was CVE-2026-7263 published?: CVE-2026-7263 was published on 2026-05-10 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

82.39.35.211 (ipv4-addr)
51.75.149.221 (ipv4-addr)