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

Status: published. Published: 2026-08-10. Updated: 2026-11-08.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/frostming/unearth/pull/181
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/frostming/unearth/commit/6c78164e7bfa28b8b3d6f247b87e560692e3c8ba

## Affected products and versions

- frostming / unearth (frostming/unearth): ≥ 0; ≤ 0.18.2 (affected, semver); 6c78164e7bfa28b8b3d6f247b87e560692e3c8ba (unaffected, git). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.2 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.59% as of 2026-11-08; percentile 48.65%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-22

## Exploit evidence

- exploit: https://github.com/frostming/unearth/issues/180 (CNA: VulnCheck)

## References

- https://github.com/frostming/unearth/issues/180 (CNA: VulnCheck; technical-description, exploit, issue-tracking)

- https://github.com/frostming/unearth/pull/181 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/frostming/unearth/commit/6c78164e7bfa28b8b3d6f247b87e560692e3c8ba (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/unearth-path-traversal-via-unnormalized-paths-and-symlink-escape (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-73030; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-73030; retrieved 2026-11-08; source updated Not reported

Revision: f3b8167fe02a730615fdf7a02fa4d377139c341b2f8057744dbeacbb964a5afa

Canonical: https://y2.dev/cve/CVE-2026-73030

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