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Fencer Vulns
medium 5.3

CVE-2023-23457 json

Upx: segv on packlinuxelf64::invert_pt_dynamic() in p_lx_elf.cpp

published 2023-01-12 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-27557

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

A Segmentation fault was found in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.

Patch / fix

  • upx upx 2022-11-23
  • upx-ucl Debian 14, Debian 13 4.2.2-1

debian advisories DEBIAN-CVE-2023-23457

  • upx openSUSE Tumbleweed 4.0.1-2.1
  • upx Package Hub 15 SP4, openSUSE Leap 15.4 4.0.2-bp154.4.6.1
  • upx Package Hub 15 SP4, openSUSE Leap 15.4 4.0.1-bp154.4.3.1

opensuse advisories openSUSE-SU-2024:12613-1openSUSE-SU-2023:0088-1openSUSE-SU-2023:0031-1

  • upx Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 4.0.2-r0

alpine advisories ALPINE-CVE-2023-23457

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-2023-23457 updated cvss 5.3

upx: SEGV on PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp

  • 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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/upx/upx/issues/631 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.