# NousResearch/hermes-agent · OAuth PKCE state and code_verifier conflation security fix

## Open now

- Nothing open on GitHub.

These members concern a security vulnerability where the OAuth PKCE code_verifier was incorrectly reused as the state parameter, leaking it via the authorization URL. The group includes the bug report, fixes separating the two values, and related cleanup of an unused PKCE flow.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #26861. Verify it addresses your case.
- **Recommended:** read PR #26861 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-26861`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.67`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #10693: OAuth PKCE code_verifier reused as state parameter — verifier leaked via authorization URL

## Prior & competing PRs

- **#26861: fix(security): separate OAuth PKCE state from code_verifier (#10693)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/anthropic_adapter.py`, `scripts/release.py`, `tests/agent/test_anthropic_oauth_pkce.py`
- **#10699: fix(security): separate OAuth PKCE state from code_verifier**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#26861`, `#1775`, `#2647`, `#3107`, `#10699`

## Fix status

- Merged to main in PR #26861 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-05-16`.