Description
Buffer underflow in the build_tree function in unpack.c in gzip 1.3.5 allows context-dependent attackers to execute arbitrary code via a crafted leaf count table that causes a write to a negative index.
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 | gzip | 1.3.5-15 | — |
| Debian 13 | gzip | 1.3.5-15 | — |
| Debian 12 | gzip | 1.3.5-15 | — |
| Debian 3.1 | gzip | 1.3.5-10sarge2 | DSA-1181-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | gzip | 1.3.3-16.rhel4 | RHSA-2006:0667 |
| RHEL 3 | gzip | 1.3.3-13.rhel3 | RHSA-2006:0667 |
Advisories 2
- RHSA-2006:0667 Red Hat Security Advisory: gzip security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1181-1 gzip Debian Security (DSA / DLA) · Mar 9, 2026
References
- ADV-2006-4760 vdb-entry
- ADV-2006-4750 vdb-entry
- 23679 third-party-advisory
- GLSA-200611-24 vendor-advisory
- 24435 third-party-advisory
- 22085 third-party-advisory
- 22043 third-party-advisory
- SUSE-SA:2006:056 vendor-advisory
- http://support.avaya.com/elmodocs2/security/ASA-2006-218.htm
- 22487 third-party-advisory
- oval:org.mitre.oval:def:10140 vdb-entry signature
- https://issues.rpath.com/browse/RPL-615
- 22033 third-party-advisory
- 22002 third-party-advisory
- ADV-2006-3695 vdb-entry
- http://docs.info.apple.com/article.html?artnum=304829
- 21996 third-party-advisory
- 23153 third-party-advisory
- http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=204676
- 22009 third-party-advisory
- 22017 third-party-advisory
- ADV-2007-0092 vdb-entry
- RHSA-2006:0667 vendor-advisory
- ADV-2007-1171 vdb-entry
- GLSA-200609-13 vendor-advisory
- FLSA:211760 vendor-advisory
- FreeBSD-SA-06:21 vendor-advisory
- OpenPKG-SA-2006.020 vendor-advisory
- USN-349-1 vendor-advisory
- http://www.vmware.com/support/esx25/doc/esx-254-200702-patch.html
- 22435 third-party-advisory
- 23156 third-party-advisory
- 20070330 VMSA-2007-0002 VMware ESX security updates mailing-list
- 22027 third-party-advisory
- MDKSA-2006:167 vendor-advisory
- 23155 third-party-advisory
- HPSBUX02195 vendor-advisory
- 20101 vdb-entry
- 2006-0052 vendor-advisory
- 102766 vendor-advisory
- HPSBTU02168 vendor-advisory
- gzip-unpack-buffer-underflow(29042) vdb-entry
- APPLE-SA-2006-11-28 vendor-advisory
- TA06-333A third-party-advisory
- 20060919 rPSA-2006-0170-1 gzip mailing-list
- 24636 third-party-advisory
- VU#554780 third-party-advisory
- 22012 third-party-advisory
- 1016883 vdb-entry
- SSA:2006-262 vendor-advisory
- 22034 third-party-advisory
- 22101 third-party-advisory
- DSA-1181 vendor-advisory
- ADV-2007-0832 vdb-entry
- 22661 third-party-advisory
- ADV-2006-4275 vdb-entry