CVE-2006-4336

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.

Published: 2006-09-19 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2006-4336 is rated High Risk (68/100): CVSS High severity, with high exploitation likelihood (EPSS 13.84%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +11.26% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2006-4336

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-12 2.57% 13.84% +11.26%
2 2026-03-02 4.56% 2.57% -1.99%
3 2025-07-13 — 4.56% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2006-4336

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2006-4336

OS Trackers for CVE-2006-4336

vendor priority summary link
debian high CVE-2006-4336 high priority: Debian including 1 source packages (gzip), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2006-4336
gentoo normal CVE-2006-4336: 2 GLSA(s) (200609-13, 200611-24), 2 atom(s) (app-arch/gzip, app-arch/lha); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2006-4336
redhat low — https://access.redhat.com/security/cve/CVE-2006-4336
ubuntu medium CVE-2006-4336 medium priority: Ubuntu including 1 source packages (gzip), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. https://ubuntu.com/security/CVE-2006-4336

Vendor comments (NVD) for CVE-2006-4336

  • Red Hat (2007-03-14T00:00:00)

    Red Hat Enterprise Linux 5 is not vulnerable to this issue as it contains a backported patch.

Affected software / configurations for CVE-2006-4336

Vendor Product Version Raw CPE
gzip gzip 1.3.5 cpe:2.3:a:gzip:gzip:1.3.5:*:*:*:*:*:*:*

References for CVE-2006-4336

URL Tags
ftp://patches.sgi.com/support/free/security/advisories/20061001-01-P.asc
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=204676
http://docs.info.apple.com/article.html?artnum=304829
http://lists.apple.com/archives/security-announce/2006/Nov/msg00001.html
http://secunia.com/advisories/21996
http://secunia.com/advisories/22002
http://secunia.com/advisories/22009 Vendor Advisory
http://secunia.com/advisories/22012 Patch Vendor Advisory
http://secunia.com/advisories/22017 Vendor Advisory
http://secunia.com/advisories/22027
http://secunia.com/advisories/22033 Vendor Advisory
http://secunia.com/advisories/22034 Vendor Advisory
http://secunia.com/advisories/22043 Patch Vendor Advisory
http://secunia.com/advisories/22085
http://secunia.com/advisories/22101
http://secunia.com/advisories/22435
http://secunia.com/advisories/22487
http://secunia.com/advisories/22661
http://secunia.com/advisories/23153
http://secunia.com/advisories/23155
http://secunia.com/advisories/23156
http://secunia.com/advisories/23679
http://secunia.com/advisories/24435
http://secunia.com/advisories/24636
http://security.freebsd.org/advisories/FreeBSD-SA-06:21.gzip.asc
http://security.gentoo.org/glsa/glsa-200609-13.xml
http://securitytracker.com/id?1016883
http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.555852
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102766-1
http://support.avaya.com/elmodocs2/security/ASA-2006-218.htm
http://www.gentoo.org/security/en/glsa/glsa-200611-24.xml
http://www.kb.cert.org/vuls/id/554780 US Government Resource
http://www.mandriva.com/security/advisories?name=MDKSA-2006:167
http://www.novell.com/linux/security/advisories/2006_56_gzip.html
http://www.openpkg.org/security/advisories/OpenPKG-SA-2006.020-gzip.html
http://www.redhat.com/support/errata/RHSA-2006-0667.html
http://www.securityfocus.com/archive/1/446426/100/0/threaded
http://www.securityfocus.com/archive/1/450078/100/0/threaded
http://www.securityfocus.com/archive/1/451324/100/0/threaded
http://www.securityfocus.com/archive/1/462007/100/0/threaded
http://www.securityfocus.com/archive/1/464268/100/0/threaded
http://www.securityfocus.com/bid/20101
http://www.trustix.org/errata/2006/0052/
http://www.ubuntu.com/usn/usn-349-1
http://www.us-cert.gov/cas/techalerts/TA06-333A.html US Government Resource
http://www.us.debian.org/security/2006/dsa-1181
http://www.vmware.com/support/esx25/doc/esx-254-200702-patch.html
http://www.vupen.com/english/advisories/2006/3695
http://www.vupen.com/english/advisories/2006/4275
http://www.vupen.com/english/advisories/2006/4750
http://www.vupen.com/english/advisories/2006/4760
http://www.vupen.com/english/advisories/2007/0092
http://www.vupen.com/english/advisories/2007/0832
http://www.vupen.com/english/advisories/2007/1171
https://exchange.xforce.ibmcloud.com/vulnerabilities/29042
https://issues.rpath.com/browse/RPL-615
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10140
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