Skip to main content
No exploitation reportedFix available

CVE-2018-11243

No exploitation reported by the sources we read.

  • Published2018-05-18
  • WeaknessCWE-415

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

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.

Timeline

dates in UTC
  1. 2018-05-1817:29CVE publishedNVD

Versions per branch

NVD
Upx
BranchAffectedFixed in
3.95= 3.95no 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

  • uclSUSE:Package Hub 15 SP1all versions · fixed in 1.03-bp151.4.3.1
  • uclopenSUSE:Tumbleweedall versions · fixed in 1.03-4.9
  • uclopenSUSE:Leap 15.1all versions · fixed in 1.03-lp151.3.3.1
  • 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

24 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-11243 Red Hat Product Security

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

Full record on NVD

Fix

Advisories and patches

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:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2018-05-18
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-xvcg-hv6h-729g

Frequently asked questions

What is CVE-2018-11243?

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.

Is CVE-2018-11243 actively exploited?

Active exploitation of CVE-2018-11243 has not been confirmed. Its EPSS score was 2.4% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-11243?

CVE-2018-11243 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Running upx? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record