unlzh.c in the LHZ component in gzip 1.3.5 allows context-dependent attackers to cause a denial of service (infinite loop) via a crafted GZIP archive.
Conclusion & alert: CVE-2006-4338 is rated Moderate Risk (52.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 4.68%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
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 | 3.74% | 4.68% | +0.93% |
| 2 | 2026-03-26 | 4.13% | 3.74% | -0.38% |
| 3 | 2026-03-02 | — | 4.13% | — |
Full EPSS history (17 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
medium | CVE-2006-4338 medium 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-2006-4338 |
gentoo
|
normal | CVE-2006-4338: 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-2006-4338 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2006-4338 |
ubuntu
|
medium | CVE-2006-4338 medium priority: Ubuntu including 2 source packages (gzip, lha), 18 status rows across 9 suites (dapper, edgy, feisty, gutsy, hardy, intrepid, jaunty, karmic, upstream): released 14, ignored 2, needs-triage 2. | https://ubuntu.com/security/CVE-2006-4338 |
Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=220595 The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw. Red Hat Enterprise Linux 5 is not vulnerable to this issue as it contains a backported patch.