# NousResearch/hermes-agent · A2A callback SSRF bypass and address validation fixes

## Open now

- 1 issue, 2 PRs open on GitHub.
- #126755: \[Security\] A2A push-callback SSRF guard is bypassable by DNS names, integer-form IPv4, and HTTP redirects
- PR #126814: fix(a2a): reject internal callback addresses in every spelling
- PR #129793: fix(a2a): keep callback delivery on validated origins

These members concern a security vulnerability in A2A push-callback handling where SSRF protections can be bypassed via DNS names, non-standard IPv4 representations, or HTTP redirects. The group includes the issue report and associated fixes to strengthen callback origin and address validation.

## TL;DR

- 3 member(s): 1 open issue(s), 0 closed issue(s), 2 open PR(s), 0 merged PR(s), 0 PR(s) closed without merging.
- No fix has been merged to main; one or more PRs were attempted (see below).
- **Recommended:** review the prior/competing PR(s) below. A fix was attempted but not merged; your case may extend or revive that work.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `unresolved`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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.

## Open related issues

- #126755: \[Security\] A2A push-callback SSRF guard is bypassable by DNS names, integer-form IPv4, and HTTP redirects

## Prior & competing PRs

- **#126814: fix(a2a): reject internal callback addresses in every spelling**. open
  - maintainer direction: category `uncategorized`; implication `needs_llm`; refs `3ea81ab14710`
  - files: `plugins/platforms/a2a/adapter.py`, `plugins/platforms/a2a/security.py`, `tests/plugins/test_a2a_callback_ssrf.py`, `tests/plugins/test_a2a_phase23.py`
- **#129793: fix(a2a): keep callback delivery on validated origins**. open
  - maintainer direction: category `silent_close`; implication `active`
  - files: `plugins/platforms/a2a/adapter.py`, `plugins/platforms/a2a/security.py`, `tests/plugins/test_a2a_callback_ssrf.py`, `tests/plugins/test_a2a_phase23.py`

## Fix status

- No merged fix on record.
- Subsystem: `agent`