🛡️ GHSA-3cv2-h65g-fgmm — astral-tokio-tar

⚪ Unknown ✅ No Known Exploit CWE-20 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

astral-tokio-tar has a PAX Header Desynchronization issue

Impact

Versions of astral-tokio-tar prior to 0.6.2 contain a PAX header interpretation bug that allows manipulated entries to be made selectively visible or invisible during extraction with astral-tokio-tar versus other tar implementations. An attacker could use this differential to smuggle unexpected files onto a victim's filesystem.

Details

When a tar stream contains multiple "header" entries prior to a file entry, astral-tokio-tar applies the PAX header (x) to the next entry in the stream, regardless of type. For example, a stream of x -> L -> file (PAX, GNU longname, file) would result in x's extensions being applied to L rather than to file.

[Per POSIX pax](https://pubs.opengroup.org/onlinepubs/9799919799/utilities/pax.html), this is incorrect: a PAX header always applies to a file entry, not any intermediary entries. See the "pax Header Block" section for the specific prescription there.

As a result of this, an attacker can contrive a tar containing a sequence of tar headers such that astral-tokio-tar applies the PAX header's size extension to the next header in sequence, effectively desynchronizing the stream and enabling astral-tokio-tar specific skippage/extraction of members. In other words, a file can be contrived to extract differently on astral-tokio-tar than on other tar parsers.

Patches

Versions 0.6.2 and newer of astral-tokio-tar address this differential.

Workarounds

Users are advised to upgrade to version 0.6.1 or newer to address this advisory.

There is no workaround other than upgrading. Users should experience no breaking changes as a result of the upgrade.

Resources

  • GHSA-j5gw-2vrg-8fgx is a similar PAX desynchronization bug
  • GHSA-fp55-jw48-c537 is another similar PAX desynchronization bug

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity low, availability none.

Weakness class

GHSA-3cv2-h65g-fgmm is classified as CWE-20: Improper Input Validation. The application accepts input without checking that it has the expected form, so malformed values reach code that assumes they are well formed.

Affected software

GHSA-3cv2-h65g-fgmm is recorded against 1 package.

  • astral-tokio-tar

Timeline and source

Published on 29 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)
rustsec.org (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CWE CWE-20
Public Exploit ✅ No
Source OSV
Published 2026-05-29
Updated 2026-08-20
Modified 2026-05-29
Fix URL N/A

Affected Packages

Software From version Fixed in
astral-tokio-tar — —

Free Vulnerability Check

Is your site affected by GHSA-3cv2-h65g-fgmm?

BotEraser helps you identify potentially vulnerable plugins and themes by checking your installation against GHSA-3cv2-h65g-fgmm and other known CVE records.

Scan My Site Free →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

Browse related advisories

All advisoriesGitHub AdvisoryGitHub Advisory Undated