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.
Problem types
Product status
8.2.* (semver) before 8.2.31
8.3.* (semver) before 8.3.31
8.4.* (semver) before 8.4.21
8.5.* (semver) before 8.5.6
Credits
xfourj
Ilija Tovilo
References
github.com/...hp-src/security/advisories/GHSA-m8rr-4c36-8gq4