CVE-2025-62518

astral-tokio-tar Vulnerable to PAX Header Desynchronization

CVE-2025-62518 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2025-62518, released October 21, 2025. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.1

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0070

53rd percentile

astral-tokio-tar is a tar archive reading/writing library for async Rust. Versions of astral-tokio-tar prior to 0.5.6 contain a boundary parsing vulnerability that allows attackers to smuggle additional archive entries by exploiting inconsistent PAX/ustar header handling. When processing archives with PAX-extended headers containing size overrides, the parser incorrectly advances stream position based on ustar header size (often zero) instead of the PAX-specified size, causing it to interpret file content as legitimate tar headers. This issue has been patched in version 0.5.6. There are no workarounds.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
python-uv · opensuse-leap 16.0	0.7.18-160000.3.1	OPENSUSE-SU-2026:20026-1	Jan 13, 2026
python-uv · sles 16.0	0.7.18-160000.3.1	SUSE-SU-2026:20077-1	Jan 13, 2026
rust-astral-tokio-tar · Debian 14	0.5.6-1	DEBIAN-CVE-2025-62518	Oct 21, 2025

Details

Published
October 21, 2025
Weakness
Access of Resource Using Incompatible Type ('Type Confusion')
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62518

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