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Servers and applications

CVE-2025-54574

SQUID-2025:1 Buffer Overflow in URN Handling

Severity
Critical 9.8
Published
31 Jul 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
6.4
Also known as
GHSA-w4gv-vw3f-29g3
Sources
NVD, Project advisories (GitHub)

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 software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • Every version before 6.4
SquidServers and applications · github:squid-cache/squid
  • Every version before 6.4

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-54574
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-54574
  • GitHub Advisory Database https://github.com/advisories/GHSA-w4gv-vw3f-29g3
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3