CVE-2026-70622 PUBLISHED

tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all()

Assigner: VulnCheck
Reserved: 04.08.2026 Published: 10.08.2026 Updated: 11.08.2026

tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 7.1

Product Status

Vendor composefs
Product tar-rs
Versions Default: affected
  • affected from 0.4.11 to 0.4.46 (incl.)

Credits

  • Ali Firas (thesmartshadow) finder

References

Problem Types

  • Improper Link Resolution Before File Access ('Link Following') CWE