CVE-2026-70622

Summary

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.

Affected Software

Weaknesses

• CWE-59: Improper Link Resolution Before File Access ('Link Following')

References

• https://gist.github.com/thesmartshadow/e7dac0bb690ee17b9cc142154cb11726
• https://www.vulncheck.com/advisories/tar-rs-symlink-escape-via-append-dir-all

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