lrzip v0.641 was discovered to contain a multiple concurrency use-after-free between the functions zpaq_decompress_buf() and clear_rulist().

published 2022-03-28 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-30852

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

lrzip v0.641 was discovered to contain a multiple concurrency use-after-free between the functions zpaq_decompress_buf() and clear_rulist(). This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted Irz file.

Patch / fix

distros 3 links 1

debian ubuntu alpine

lrzip Debian 14, Debian 13, Debian 12 0.650-1

debian advisories DEBIAN-CVE-2022-26291

lrzip Ubuntu 18.04 LTS 0.631-1+deb9u3build0.18.04.1
lrzip Ubuntu 20.04 LTS 0.631+git180528-1+deb10u1build0.20.04.1
lrzip Ubuntu Pro 16.04 LTS 0.621-1ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2022-26291

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

lrzip Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 0.650-r0

alpine advisories ALPINE-CVE-2022-26291

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

github.com/ckolivas/lrzip/issues/206 advisory

Exploit prediction

0.87% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/ckolivas/lrzip/issues/206 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-416 Use After Free

References

github.com /ckolivas/lrzip/issues/206
exploit, issue-tracking, patch, third-party-advisory
debian.org /security/2022/dsa-5145
vendor-advisory, third-party-advisory
lists.debian.org /debian-lts-announce/2022/04/msg00012.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2022-26291
NVD CVE-2022-26291

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary