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Fencer Vulns
medium 5.5

CVE-2018-5747 json

In Long Range Zip (aka lrzip) 0.631, there is a use-after-free in the ucompthread function (stream.c).

published 2018-01-17 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17516

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

In Long Range Zip (aka lrzip) 0.631, there is a use-after-free in the ucompthread function (stream.c). Remote attackers could leverage this vulnerability to cause a denial of service via a crafted lrz file.

Patch / fix

  • lrzip Debian 14, Debian 13, Debian 12 0.631+git180517-1

debian advisories DEBIAN-CVE-2018-5747

  • lrzip Ubuntu 18.04 LTS 0.631-1+deb9u1build0.18.04.1
  • lrzip Ubuntu Pro 14.04 LTS 0.616-1ubuntu0.1~esm1
  • lrzip Ubuntu Pro 16.04 LTS 0.621-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2018-5747

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

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-5747 updated cvss 5.5

lrzip: use-after-free in ucompthread function in stream.c

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.23% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/ckolivas/lrzip/issues/90 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

References

Sources

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.