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Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2026-7258

MEDIUM 6.3 CVSS 4.0
Published
May 10, 2026
Last modified
July 24, 2026
NVD status
Analyzed
Reported by
security@php.net
Weakness
CWE-125
CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber

Description

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some functions, including urldecode(), pass signed char to ctype functions (like isxdigit()). On the systems with default signed char and optimized table-lookup ctype functions - such as NetBSD - this can lead to accessing array with negative offset, which can trigger a denial of service.

Affected products and versions

  • PHP — From 8.2.0 (including) to 8.2.21 (excluding)
  • PHP — From 8.3.0 (including) to 8.3.31 (excluding)
  • PHP — From 8.4.0 (including) to 8.4.21 (excluding)
  • PHP — From 8.5.0 (including) to 8.5.6 (excluding)

References

  • github.com https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4 Vendor Advisory
  • nvd.nist.gov Official NVD record