GHSA-xx64-wwv2-hcqq
astral-tokio-tar: `unpack_in` can chmod arbitrary directories by following symlinks
GHSA-xx64-wwv2-hcqq is a low vulnerability (CVSS 2.7) in astral-tokio-tar, published April 27, 2026. No source lists public exploit code. Fixed in astral-tokio-tar 0.6.1.
- Severity
- 2.7 LowCVSS 4.0, GitHub Advisories
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
0.6.1astral-tokio-tar +2 more
Description
Impact
In versions 0.6.0 and earlier of astral-tokio-tar, the unpack_in API could inadvertently modify the permissions of external (i.e. non-archive) directories outside of the archive. An attacker could use this to contrite a tar archive that maliciously changes directory permissions outside of its intended hierarchy. This flaw only affects directories; individual file permissions cannot be modified via it.
See GHSA-j4xf-2g29-59ph for the equivalent flaw in the tar crate.
Patches
Versions 0.6.1 and newer of astral-tokio-tar use fs::symlink_metdata rather than fs::metadata, avoiding the traversal.
Workarounds
Users are advised to upgrade to version 0.6.1 or newer to address this advisory.
Users should experience no breaking changes as a result of the patch above.
Resources
- GHSA-j4xf-2g29-59ph for the original
tarvulnerability
Attribution
- Reporter: Adam Harvey (@lawngnome)
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Affected packages
| Package | Affected | Fixed |
|---|---|---|
astral-tokio-tarcrates.io | through 0.6.0 | 0.6.1 |
astral-tokio-tarcrates.io | before 0.6.1 | 0.6.1 |
astral-tokio-tarcrates.io | 0.0.0-0 up to 0.6.1 | 0.6.1 |
What each source reports
GitHub Advisories Score used
astral-tokio-tar: `unpack_in` can chmod arbitrary directories by following symlinks
Impact
In versions 0.6.0 and earlier of astral-tokio-tar, the unpack_in API could inadvertently modify the permissions of external (i.e. non-archive) directories outside of the archive. An attacker could use this to contrite a tar archive that maliciously changes directory permissions outside of its intended hierarchy. This flaw only affects directories; individual file permissions cannot be modified via it.
See GHSA-j4xf-2g29-59ph for the equivalent flaw in the tar crate.
Patches
Versions 0.6.1 and newer of astral-tokio-tar use fs::symlink_metdata rather than fs::metadata, avoiding the traversal.
Workarounds
Users are advised to upgrade to version 0.6.1 or newer to address this advisory.
Users should experience no breaking changes as a result of the patch above.
Resources
- GHSA-j4xf-2g29-59ph for the original
tarvulnerability
Attribution
- Reporter: Adam Harvey (@lawngnome)
- Record
GHSA-xx64-wwv2-hcqq- CVSS 4.0
- 2.7 Low
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/E:U - Weakness
- CWE-61
- Updated
- 2026-11-02
OSV
astral-tokio-tar: `unpack_in` can chmod arbitrary directories by following symlinks
Impact
In versions 0.6.0 and earlier of astral-tokio-tar, the unpack_in API could inadvertently modify the permissions of external (i.e. non-archive) directories outside of the archive. An attacker could use this to contrite a tar archive that maliciously changes directory permissions outside of its intended hierarchy. This flaw only affects directories; individual file permissions cannot be modified via it.
See GHSA-j4xf-2g29-59ph for the equivalent flaw in the tar crate.
Patches
Versions 0.6.1 and newer of astral-tokio-tar use fs::symlink_metdata rather than fs::metadata, avoiding the traversal.
Workarounds
Users are advised to upgrade to version 0.6.1 or newer to address this advisory.
Users should experience no breaking changes as a result of the patch above.
Resources
- GHSA-j4xf-2g29-59ph for the original
tarvulnerability
Attribution
- Reporter: Adam Harvey (@lawngnome)
- Record
GHSA-xx64-wwv2-hcqq- CVSS 4.0
- 2.7 Low
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/E:U - Weakness
- CWE-61
- Updated
- 2026-11-02
OSVRUSTSEC-2026-0113No score
`unpack_in` can chmod arbitrary directories by following symlinks
In versions 0.6.0 and earlier of astral-tokio-tar, the unpack_in API could inadvertently modify the permissions of external (i.e. non-archive) directories outside of the archive. An attacker could use this to contrite a tar archive that maliciously changes directory permissions outside of its intended hierarchy. This flaw only affects directories; individual file permissions cannot be modified via it.
See GHSA-j4xf-2g29-59ph for the equivalent flaw in the tar crate.
- Record
RUSTSEC-2026-0113- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.