Description
Squid Web Proxy Cache 2.5 might allow remote attackers to obtain sensitive information via URLs containing invalid hostnames that cause DNS operations to fail, which results in references to previously used error messages.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | squid | 2.5.8 | — |
| Debian 13 | squid | 2.5.8 | — |
| Debian 12 | squid | 2.5.8 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | squid | 7:2.5.STABLE6-3.4E.11 | RHSA-2005:766 |
| RHEL 3 | squid | 7:2.5.STABLE3-6.3E.14 | RHSA-2005:766 |
Advisories 1
- RHSA-2005:766 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- squid-hostname-obtain-info(18406) vdb-entry
- 1012466 vdb-entry
- 12282 vdb-entry
- FLSA-2006:152809 vendor-advisory
- 13408 third-party-advisory
- http://www.squid-cache.org/bugs/show_bug.cgi?id=1143
- oval:org.mitre.oval:def:9711 vdb-entry signature
- RHSA-2005:766 vendor-advisory
- 11865 vdb-entry
- 16977 third-party-advisory