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No exploitation reportedFix available

CVE-2019-20053

No exploitation reported by the sources we read.

  • Published2019-12-27
  • WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An invalid memory address dereference was discovered in the canUnpack function in p_mach.cpp in UPX 3.95 via a crafted Mach-O file.

Timeline

dates in UTC
  1. 2019-12-2722:15CVE publishedNVD

Versions per branch

NVD
Upx
BranchAffectedFixed in
3.95= 3.95no fix published
Opensuse backports
BranchAffectedFixed in
—= sle-15no fix published
Opensuse leap
BranchAffectedFixed in
15.1= 15.1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • uclMageia:7all versions · fixed in 1.03-16.1.mga7
  • upxSUSE:Package Hub 15 SP1all versions · fixed in 3.96-bp151.4.3.1
  • upxopenSUSE:Tumbleweedall versions · fixed in 3.96-3.2
  • upxopenSUSE:Leap 15.1all versions · fixed in 3.96-lp151.3.3.1
  • upxMageia:7all versions · fixed in 3.96-1.mga7
  • upxCleanStartall versions · fixed in 3.96-r0
  • upxAlpine:v3.24all versions · fixed in 3.96-r0
  • upxAlpine:v3.23all versions · fixed in 3.96-r0

16 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-20053 Red Hat Product Security

    upx: invalid memory address dereference in canUnpack in p_mach.cpp

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published
2019-12-27
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-phmx-286h-jcc3

Frequently asked questions

What is CVE-2019-20053?

An invalid memory address dereference was discovered in the canUnpack function in p_mach.cpp in UPX 3.95 via a crafted Mach-O file.

Is CVE-2019-20053 actively exploited?

Active exploitation of CVE-2019-20053 has not been confirmed. Its EPSS score was 1.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-20053?

CVE-2019-20053 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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