astral-tokio-tar Vulnerable to PAX Header Desynchronization
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.1epss 0.7%
exploitation probability
0.7%top 49% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Affected products
astral-sh · tokio-tarReferences
https://edera.dev/stories/tarmageddonhttps://github.com/astral-sh/tokio-tar/commit/22b3f884adb7a2adf1d3a8d03469533f5cbc8318https://github.com/astral-sh/tokio-tar/security/advisories/GHSA-j5gw-2vrg-8fgxhttps://github.com/astral-sh/uv/security/advisories/GHSA-w476-p2h3-79g9https://github.com/edera-dev/cve-tarmageddon