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CVE-2023-23456

Upx: heap-buffer-overflow in packtmt::pack()

5.3 MediumFix available

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) 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
Low
Integrity
Low
Availability
Low

Exploit likelihood

0.40%Down 0.5 points since Jan 13, 2023
90%50%10%1%

What each source reports

CVE List Score used 5.3

Upx: heap-buffer-overflow in packtmt::pack()

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

Record
CVE-2023-23456
CVSS 3.1
5.3 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness
CWE-787
Updated
2026-11-02
EUVDEUVD-2023-27556 5.3

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

Record
EUVD-2023-27556
CVSS 3.1
5.3 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Updated
2026-11-03
GitHub AdvisoriesGHSA-3j7g-922g-j6r3 5.5

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file....

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

Record
GHSA-3j7g-922g-j6r3
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-787
Updated
2026-11-02
NVD 5.3

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

Record
CVE-2023-23456
CVSS 3.1
5.3 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-787
Updated
2026-11-02
OSVALPINE-CVE-2023-23456 5.5

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

Record
ALPINE-CVE-2023-23456
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSVBELL-CVE-2023-23456 5.5

CVE-2023-23456 does not affect BellSoft software

Record
BELL-CVE-2023-23456
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 5 moreShow less
OSV 5.3

Upx: heap-buffer-overflow in packtmt::pack()

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

Record
CVE-2023-23456
CVSS 3.1
5.3 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness
CWE-787
Updated
2026-11-02
OSVDEBIAN-CVE-2023-23456 5.5

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

Record
DEBIAN-CVE-2023-23456
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2023-23456 5.3

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

Record
UBUNTU-CVE-2023-23456
CVSS 3.1
5.3 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2023-0052 No score

Updated upx packages fix security vulnerability

Denial of service due to heap-based buffer overflow issue in UPX in PackTmt::pack() in p_tmt.cpp file. (CVE-2023-23456) Denial of service due to segmentation fault in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. (CVE-2023-23457)

Record
MGASA-2023-0052
Updated
2026-11-02
OSVopenSUSE-SU-2023:0088-1 No score

Security update for upx

upx was updated to fix the following issues:

Update to release 4.0.2

  • Fix unpack of ELF x86-64 that failed with 'CantUnpackException: corrupt b_info'
  • Resolve SEGV on PackLinuxElf64::invert_pt_dynamic
  • CVE-2021-30500: Fixed Null pointer dereference in PackLinuxElf:canUnpack() in p_lx_elf.cpp
  • CVE-2021-30501: Fixed Assertion abort in function MemBuffer:alloc()
  • CVE-2021-43311: Fixed Heap-based buffer overflow in PackLinuxElf32:elf_lookup() at p_lx_elf.cpp
  • CVE-2021-43312: Fixed Heap-based buffer overflow in PackLinuxElf64:invert_pt_dynamic at p_lx_elf.cpp:5239
  • CVE-2021-43313: Fixed Heap-based buffer overflow in PackLinuxElf32:invert_pt_dynamic at p_lx_elf.cpp:1688
  • CVE-2021-43314: Fixed Heap-based buffer overflows in PackLinuxElf32:elf_lookup() at p_lx_elf.cp
  • CVE-2021-43315: Fixed Heap-based buffer overflows in PackLinuxElf32:elf_lookup() at p_lx_elf.cp
  • CVE-2021-43316: Fixed Heap-based buffer overflow in func get_le64()
  • CVE-2021-43317: Fixed Heap-based buffer overflows in PackLinuxElf64:elf_lookup() at p_lx_elf.cp
  • CVE-2023-23456: Fixed heap-buffer-overflow in PackTmt:pack()
  • CVE-2023-23457: Fixed SEGV on PackLinuxElf64:invert_pt_dynamic() in p_lx_elf.cpp
Record
openSUSE-SU-2023:0088-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
upx
Alpine:v3.17
 before 4.0.2-r0
4.0.2-r0
upx
Alpine:v3.18
 before 4.0.2-r0
4.0.2-r0
upx
Alpine:v3.19
 before 4.0.2-r0
4.0.2-r0
upx
Alpine:v3.20
 before 4.0.2-r0
4.0.2-r0
upx
Alpine:v3.21
 before 4.0.2-r0
4.0.2-r0
upx
Alpine:v3.22
 before 4.0.2-r0
4.0.2-r0
upx
Alpine:v3.23
 before 4.0.2-r0
4.0.2-r0
upx
Alpine:v3.24
 before 4.0.2-r0
4.0.2-r0
upx-ucl
Debian:13
 before 4.2.2-1
4.2.2-1
upx-ucl
Debian:14
 before 4.2.2-1
4.2.2-1
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Affected packages
PackageAffectedFixed
upx-ucl
Debian:11
 before 3.96-2+deb11u1, plus listed versions
3.96-2
3.96-2+deb11u1
upx
Mageia:8
From an advisory covering 2 CVEs
 before 4.0.2-1.mga8
4.0.2-1.mga8
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
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
upx
SUSE:Package Hub 15 SP4
From an advisory covering 12 CVEs
 before 4.0.2-bp154.4.6.1
4.0.2-bp154.4.6.1
upx
openSUSE:Leap 15.4
From an advisory covering 12 CVEs
 before 4.0.2-bp154.4.6.1
4.0.2-bp154.4.6.1

History

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

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

In short

CVE-2023-23456 is a medium vulnerability (CVSS 5.3) in Upx, published January 12, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. Fixed in upx 4.0.2-r0.

References

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