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CVE-2018-11243

PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of...

7.8 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.38%Down 0.8 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.8

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.

Record
CVE-2018-11243
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-415
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2018-11243
Updated
2026-11-02
EUVDEUVD-2018-3283 No score

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.

Record
EUVD-2018-3283
Updated
2026-11-03
GitHub AdvisoriesGHSA-xvcg-hv6h-729g 7.8

PackLinuxElf64::unpack in p_lx_elf.cpp in UPX 3.95 allows remote attackers to cause a denial of...

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.

Record
GHSA-xvcg-hv6h-729g
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-415
Updated
2026-11-02
OSVBELL-CVE-2018-11243 7.8

CVE-2018-11243 does not affect BellSoft software

Record
BELL-CVE-2018-11243
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSV 7.8

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.

Record
CVE-2018-11243
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 9 moreShow less
OSVDEBIAN-CVE-2018-11243 7.8

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.

Record
DEBIAN-CVE-2018-11243
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2018-11243 7.8

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.

Record
UBUNTU-CVE-2018-11243
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVMGASA-2020-0096 No score

Updated upx packages fix security vulnerabilities

The updated packages fix security vulnerabilities:

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. (CVE-2018-11243)

A heap-based buffer over-read was discovered in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O file. (CVE-2019-20021)

A floating-point exception was discovered in PackLinuxElf::elf_hash in p_lx_elf.cpp in UPX 3.95. The vulnerability causes an application crash, which leads to denial of service. (CVE-2019-20051)

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. (CVE-2019-20053)

A denial of service in PackLinuxElf32::PackLinuxElf32help1(). (CVE-2019-1010048)

Record
MGASA-2020-0096
Updated
2026-11-02
OSVopenSUSE-SU-2020:0162-1 No score

Security update for ucl

This update for ucl fixes the following issues:

CVE-2018-11243: Fix remotely triggerable DoS via double free (boo#1094138)

Record
openSUSE-SU-2020:0162-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:0163-1 No score

Security update for upx

This update for upx to version 3.96 fixes the following issues:

  • CVE-2019-1010048: Fixed a denial of service in PackLinuxElf32::PackLinuxElf32help1() (boo#1141777).

  • CVE-2019-14296: Fixed a denial of service in canUnpack() (boo#1143839).

  • CVE-2019-20021: Fixed a heap-based buffer over-read in canUnpack() (boo#1159833).

  • CVE-2019-20053: Fixed a denial of service in canUnpack() (boo#1159920).

  • CVE-2018-11243: Fixed a denial of service in PackLinuxElf64::unpack() (boo#1094138).

  • Update to version 3.96

    • Bug fixes: [CVE-2019-1010048, boo#1141777] [CVE-2019-14296, boo#1143839] [CVE-2019-20021, boo#1159833] [CVE-2019-20053, boo#1159920] [CVE-2018-11243 partially - ticket 206 ONLY, boo#1094138]

  • Update to version 3.95

    • Flag --force-pie when ET_DYN main program is not marked as DF_1_PIE
    • Better compatibility with varying layout of address space on Linux
    • Support for 4 PT_LOAD layout in ELF generated by binutils-2.31
    • bug fixes, particularly better diagnosis of malformed input
    • bug fixes - see https://github.com/upx/upx/milestone/4
Record
openSUSE-SU-2020:0163-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:0179-1 No score

Security update for ucl

This update for ucl fixes the following issues:

CVE-2018-11243: Fix remotely triggerable DoS via double free (boo#1094138)

This update was imported from the openSUSE:Leap:15.1:Update update project.

Record
openSUSE-SU-2020:0179-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:0180-1 No score

Security update for upx

This update for upx to version 3.96 fixes the following issues:

  • CVE-2019-1010048: Fixed a denial of service in PackLinuxElf32::PackLinuxElf32help1() (boo#1141777).

  • CVE-2019-14296: Fixed a denial of service in canUnpack() (boo#1143839).

  • CVE-2019-20021: Fixed a heap-based buffer over-read in canUnpack() (boo#1159833).

  • CVE-2019-20053: Fixed a denial of service in canUnpack() (boo#1159920).

  • CVE-2018-11243: Fixed a denial of service in PackLinuxElf64::unpack() (boo#1094138).

  • Update to version 3.96

    • Bug fixes: [CVE-2019-1010048, boo#1141777] [CVE-2019-14296, boo#1143839] [CVE-2019-20021, boo#1159833] [CVE-2019-20053, boo#1159920] [CVE-2018-11243 partially - ticket 206 ONLY, boo#1094138]

  • Update to version 3.95

    • Flag --force-pie when ET_DYN main program is not marked as DF_1_PIE
    • Better compatibility with varying layout of address space on Linux
    • Support for 4 PT_LOAD layout in ELF generated by binutils-2.31
    • bug fixes, particularly better diagnosis of malformed input
    • bug fixes - see https://github.com/upx/upx/milestone/4

This update was imported from the openSUSE:Leap:15.1:Update update project.

Record
openSUSE-SU-2020:0180-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11477-1 No score

libucl1-1.03-4.9 on GA media

These are all security issues fixed in the libucl1-1.03-4.9 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11477-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11486-1 No score

upx-3.96-3.2 on GA media

These are all security issues fixed in the upx-3.96-3.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11486-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
upx-ucl
Debian:13
 before 1.03+repack-5
1.03+repack-5
upx-ucl
Debian:14
 before 1.03+repack-5
1.03+repack-5
upx
Mageia:7
From an advisory covering 5 CVEs
 before 3.96-1.mga7
3.96-1.mga7
ucl
Mageia:7
From an advisory covering 5 CVEs
 before 1.03-16.1.mga7
1.03-16.1.mga7
upx-ucl
Ubuntu:16.04:LTS
 All versions, plus listed versions
3.91-1
 None known
upx-ucl
Ubuntu:18.04:LTS
 All versions, plus listed versions
3.94-23.94-33.94-4
 None known
upx-ucl
Ubuntu:20.04:LTS
 All versions, plus listed versions
3.95-23.95-2build1
 None known
upx-ucl
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.96-23.96-3
 None known
upx-ucl
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.96-34.2.2-3
 None known
upx-ucl
Ubuntu:25.10
 All versions, plus listed versions
4.2.4-14.2.4-1.1
 None known
Show 8 moreShow less
Affected packages
PackageAffectedFixed
upx-ucl
Ubuntu:26.10
 All versions, plus listed versions
4.2.4-1.1build1
 None known
upx-ucl
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.2.4-1.14.2.4-1.1build1
 None known
ucl
openSUSE:Leap 15.1
 before 1.03-lp151.3.3.1
1.03-lp151.3.3.1
upx
openSUSE:Leap 15.1
From an advisory covering 5 CVEs
 before 3.96-lp151.3.3.1
3.96-lp151.3.3.1
ucl
SUSE:Package Hub 15 SP1
 before 1.03-bp151.4.3.1
1.03-bp151.4.3.1
upx
SUSE:Package Hub 15 SP1
From an advisory covering 5 CVEs
 before 3.96-bp151.4.3.1
3.96-bp151.4.3.1
ucl
openSUSE:Tumbleweed
 before 1.03-4.9
1.03-4.9
upx
openSUSE:Tumbleweed
From an advisory covering 7 CVEs
 before 3.96-3.2
3.96-3.2

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-11243 is a high vulnerability (CVSS 7.8) in Upx, published May 18, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.38%, the 83rd percentile. Fixed in upx-ucl 1.03+repack-5.

References

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