Array index error in the make_table function in unlzh.c in the LZH decompression component in gzip 1.3.5, when running on certain platforms, allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted GZIP archive that triggers an out-of-bounds write, aka a "stack modification vulnerability."
Conclusion & alert: CVE-2006-4335 is rated Moderate Risk (63.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.56%). Core evidence: EPSS rose +2.66% over the last day, indicating growing attacker interest. 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 | 0.90% | 3.56% | +2.66% |
| 2 | 2026-03-02 | 2.04% | 0.90% | -1.14% |
| 3 | 2025-07-31 | — | 2.04% | — |
Full EPSS history (10 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
high | CVE-2006-4335 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-2006-4335 |
gentoo
|
normal | CVE-2006-4335: 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-2006-4335 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2006-4335 |
ubuntu
|
medium | CVE-2006-4335 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-2006-4335 |
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.