Description
Buffer overflow in the idnsALookup function in dns_internal.cc in Squid 3.2 through 3.2.11 and 3.3 through 3.3.6 allows remote attackers to cause a denial of service (memory corruption and server termination) via a long name in a DNS lookup request.
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.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | squid | 7:3.1.10-22.el6_5 | RHSA-2014:1148 |
| RHEL 5 | squid | 7:2.6.STABLE21-7.el5_10 | RHSA-2014:1148 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | squid3 | 3.1.23-8.16.30.1 | SUSE-SU-2016:2089-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 11 SP4 | squid3 | 3.1.23-8.16.30.1 | SUSE-SU-2016:2089-1 |
Advisories 2
- RHSA-2014:1148 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- SUSE-SU-2016:2089-1 Security update for squid3 SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10487.patch
- http://www.squid-cache.org/Advisories/SQUID-2013_2.txt
- 54076 third-party-advisory
- SUSE-SU-2016:1996 vendor-advisory
- openSUSE-SU-2013:1441 vendor-advisory
- openSUSE-SU-2013:1444 vendor-advisory
- 54834 third-party-advisory
- openSUSE-SU-2013:1443 vendor-advisory
- http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12587.patch
- 61111 vdb-entry
- http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11823.patch
- 54839 third-party-advisory
- http://www.squid-cache.org/Versions/v3/3.0/changesets/squid-3.0-9200.patch
- SUSE-SU-2016:2089 vendor-advisory
- openSUSE-SU-2013:1435 vendor-advisory
- squid-idnsalookup-bo(85564) vdb-entry
- openSUSE-SU-2013:1436 vendor-advisory
- [oss-security] 20130711 Re: CVE request: SQUID-2013:2: buffer overflow in HTTP request handling mailing-list