What’s Vulnerable › Vulnerabilities

CVE-2025-62518: astral-tokio-tar Vulnerable to PAX Header Desynchronization

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-21 · updated 2026-10-08
• Weakness: CWE-843

Description

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.

Affected products

• astral-sh tokio-tar: before 0.5.6

References

• https://edera.dev/stories/tarmageddon
• https://github.com/astral-sh/tokio-tar/commit/22b3f884adb7a2adf1d3a8d03469533f5cbc8318
• https://github.com/astral-sh/tokio-tar/security/advisories/GHSA-j5gw-2vrg-8fgx
• https://github.com/astral-sh/uv/security/advisories/GHSA-w476-p2h3-79g9
• https://github.com/edera-dev/cve-tarmageddon

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