Remote code execution in UPX



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-2849
CWE-ID CWE-122
Exploitation vector Network
Public exploit N/A
Vulnerable software
 UPX
Universal components / Libraries / Libraries used by multiple products

Vendor UPX

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Heap-based buffer overflow

EUVDB-ID: #VU106281

Risk: Medium

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-2849

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the PackLinuxElf64::un_DT_INIT() function in p_lx_elf.cpp. A remote attacker can trick the victim into using a specially crafted file, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

UPX: 1.10 - 5.0.0

CPE2.3 External links

https://github.com/upx/upx/commit/e0b6ff192412f5bb5364c1948f4f6b27a0cd5ea2
https://github.com/upx/upx/issues/898


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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