CVE-2025-2849: A vulnerability, which was classified as problematic, was found in UPX up to 5.0.0

Q: How do I fix CVE-2025-2849?

upx: upgrade to newer than 5.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-2849 being exploited?

CVE-2025-2849 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-2849 affect?

CVE-2025-2849 affects upx. Severity is low (CVSS 3.3). A vulnerability, which was classified as problematic, was found in UPX up to 5.0.0. Affected is the function PackLinuxElf64::un_DT_INIT of the file src/p_lx_elf.cpp. The manipulation leads to heap-based buffer overflow. It is possible to la

Q: How urgent is CVE-2025-2849?

Priority 22/100. Public exploit reference

Routine

LOW 3.3UPGRADE

CVE-2025-2849 is a low-severity flaw (CVSS 3.3) affecting upx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as problematic, was found in UPX up to 5.0.0. Affected is the function PackLinuxElf64::un_DT_INIT of the file src/p_lx_elf.cpp. The manipulation leads to heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used. The patch is identified as e0b6ff192412f5bb5364c1948f4f6b27a0cd5ea2. It is recommended to apply a patch to fix th

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-119, CWE-122, CWE-787
Published	2025-03-27
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: upx

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-27 14:15 UTCPublished CVE record published
2026-06-17 09:07 UTCUpdated Record last modified

upx upx UPGRADE

Affected: <= 5.0.0

Fixed in: newer than 5.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy upx || rpm -q upx || upx --version

2. UPGRADE to newer than 5.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade upx

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade upx

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-2849?

upx: upgrade to newer than 5.0.0. Exact commands for each OS are on this page.

Is CVE-2025-2849 being exploited?

CVE-2025-2849 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-2849 affect?

CVE-2025-2849 affects upx. Severity is low (CVSS 3.3). A vulnerability, which was classified as problematic, was found in UPX up to 5.0.0. Affected is the function PackLinuxElf64::un_DT_INIT of the file src/p_lx_elf.cpp. The manipulation leads to heap-based buffer overflow. It is possible to la

How urgent is CVE-2025-2849?

Priority 22/100. Public exploit reference

References

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