CVE-2026-7258 PUBLISHED

Out-of-bounds read in urldecode() on NetBSD

Assigner: php
Reserved: 28.04.2026 Published: 10.05.2026 Updated: 10.05.2026

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.

Metrics

CVSS 4.0

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/U:Amber
CVSS Score: 6.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	High	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	Low	Availability	Low
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	PHP Group
Product	PHP
Versions	Default: affected affected from 8.2.* to 8.2.31 (excl.) affected from 8.3.* to 8.3.31 (excl.) affected from 8.4.* to 8.4.21 (excl.) affected from 8.5.* to 8.5.6 (excl.)

Credits

xfourj reporter
Ilija Tovilo remediation developer

References

https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4

Problem Types

CWE-125 Out-of-bounds Read CWE