Vulnerability · Published Aug 10, 2026 · Assigned by VulnCheck

CVE-2026-73030unearth 0.18.2 Path Traversal via Unnormalized Paths and Symlink Escape

High 8.1

In plain English

A high-severity path traversal in unearth from frostming. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.6%top 51.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

unearth through 0.18.2, fixed in commit 6c78164, contains a path traversal vulnerability in the is_within_directory function that fails to normalize paths before validation, allowing ../ sequences to bypass directory containment checks. Attackers can supply malicious tar archives with symlink members or traversal sequences to write files to arbitrary filesystem locations accessible to the process.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	unearth	no fix listed	DEBIAN-CVE-2026-73030
Debian:13	unearth	no fix listed	DEBIAN-CVE-2026-73030
Debian:14	unearth	0.18.3-1	DEBIAN-CVE-2026-73030
Ubuntu:24.04:LTS	unearth	no fix listed	UBUNTU-CVE-2026-73030
Ubuntu:26.04:LTS	unearth	no fix listed	UBUNTU-CVE-2026-73030

Affected products (as reported)

Vendor	Product	Versions
frostming	unearth	0 – through 0.18.2

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

References

Researcher Disclosure technical-description, exploit
Pull Request issue-tracking
Patch Commit patch
https://www.vulncheck.com/advisories/unearth-path-traversal-via-unnormalized-paths-and-symlink-escape third-party-advisory