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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.

PUBLISHED Reserved 2026-04-28 | Published 2026-05-10 | Updated 2026-05-10 | Assigner php




MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/U:Amber

Problem types

CWE-125 Out-of-bounds Read

Product status

Default status
affected

8.2.* (semver) before 8.2.31
affected

8.3.* (semver) before 8.3.31
affected

8.4.* (semver) before 8.4.21
affected

8.5.* (semver) before 8.5.6
affected

Credits

xfourj reporter

Ilija Tovilo remediation developer

References

github.com/...hp-src/security/advisories/GHSA-m8rr-4c36-8gq4 vendor-advisory

cve.org (CVE-2026-7258)

nvd.nist.gov (CVE-2026-7258)

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