Symlink Escape Vulnerability in tar-rs Product by Unknown Vendor
CVE-2026-70622

7.1HIGH

Key Information:

Vendor

Composefs

Status
Tar-rs
Vendor
CVE Published:
10 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-70622?

tar-rs versions 0.4.11 to 0.4.46 possess a vulnerability in the Builder::append_dir_all() function, allowing attackers to exploit symlink behavior. This flaw enables unauthorized file access by allowing symlinks to bypass the designated source root directory. When an archived process is conducted on an untrusted directory, the function erroneously follows these symlinks, leading to sensitive files being included in the archive and accessible to attackers. It is crucial for users to be aware of this risk and implement necessary measures to safeguard their systems.

Affected Version(s)

tar-rs 0.4.11 <= 0.4.46

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-70622 - Proof of Concept

References

https://gist.github.com/thesmartshadow/e7dac0bb690ee17b9c...
technical-descriptionexploit
https://www.vulncheck.com/advisories/tar-rs-symlink-escap...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ali Firas (thesmartshadow)
.