Description
Squid 3.0 through 3.0.STABLE16 and 3.1 through 3.1.0.11 does not properly enforce "buffer limits and related bound checks," which allows remote attackers to cause a denial of service via (1) an incomplete request or (2) a request with a large header size, related to (a) HttpMsg.cc and (b) client_side.cc.
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 5.0 | squid3 | 3.0.STABLE-3+lenny2 | DSA-1843-2, DSA-1843-1 |
Advisories 2
- DSA-1843-2 squid3 - regression fix Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1843-1 squid3 - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://www.squid-cache.org/Versions/v3/3.1/changesets/b9654.patch
- 1022607 vdb-entry
- 35812 vdb-entry
- ADV-2009-2013 vdb-entry
- 36007 third-party-advisory
- http://www.squid-cache.org/Advisories/SQUID-2009_2.txt
- MDVSA-2009:161 vendor-advisory
- MDVSA-2009:178 vendor-advisory