Unrated severityNVD Advisory· Published Aug 1, 2025· Updated Nov 5, 2025
Squid's URN Handling can lead to Buffer Overflow
CVE-2025-54574
Description
Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution attack when processing URN due to incorrect buffer management. This has been fixed in version 6.4. To work around this issue, disable URN access permissions.
Affected products
2- Range: < 6.4
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988mitrex_refsource_MISC
- github.com/squid-cache/squid/releases/tag/SQUID_6_4mitrex_refsource_MISC
- github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3mitrex_refsource_CONFIRM
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