Skip to content
Fencer Vulns
high 7.8

CVE-2018-11243 json

PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of service (double free), limit the ability of…

published 2018-05-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-3283

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of service (double free), limit the ability of a malware scanner to operate on the entire original data, or possibly have unspecified other impact via a crafted file.

Patch / fix

  • upx-ucl Debian 14, Debian 13 1.03+repack-5

debian advisories DEBIAN-CVE-2018-11243

  • ucl openSUSE Tumbleweed 1.03-4.9
  • upx openSUSE Tumbleweed 3.96-3.2
  • upx Package Hub 15 SP1 3.96-bp151.4.3.1
  • ucl Package Hub 15 SP1 1.03-bp151.4.3.1
  • upx openSUSE Leap 15.1 3.96-lp151.3.3.1
  • ucl openSUSE Leap 15.1 1.03-lp151.3.3.1

opensuse advisories openSUSE-SU-2024:11477-1openSUSE-SU-2024:11486-1openSUSE-SU-2020:0180-1openSUSE-SU-2020:0179-1openSUSE-SU-2020:0163-1openSUSE-SU-2020:0162-1

  • upx Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 3.96-r0

alpine advisories ALPINE-CVE-2018-11243

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org 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-2018-11243 updated cvss 3.3

upx: Double-free in PackLinuxElf64::unpack in p_lx_elf.cpp allows denial of service

  • 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

2.38% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/upx/upx/issues/206 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/upx/upx/issues/207 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/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.