PT-2026-42912 · Nousresearch · Hermes-Agent

Eric-I · CVE-2026-9354 · Published 2026-05-24 · Updated 2026-05-24

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Name of the Vulnerable Software and Affected Versions hermes-agent versions prior to 2026.4.17

Description A remote issue exists in the Slack Agent/Mattermost Agent component of NousResearch hermes-agent. Manipulation of the format message argument leads to output escaping.

Recommendations Update to a version later than 2026.4.16. As a temporary workaround, restrict the use of the format message argument within the Slack Agent/Mattermost Agent component.

Exploit

Fix

Improper Encoding or Escaping of Output

Special Elements Injection

Weakness Enumeration

CWE-116

CWE-74

Related Identifiers

CVE-2026-9354

Affected Products

Hermes-Agent

References · 7

• 🔥 https://gist.github.com/YLChen-007/e90fb38ac03284176bae49898a3a46a4 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-9354 · Security Note
• https://vuldb.com/vuln/365317/cti · Note
• https://vuldb.com/vuln/365317 · Note
• https://t.me/CVEtracker/54750 · Telegram Post
• https://vuldb.com/submit/812226 · Note
• https://twitter.com/CVEnew/status/2058530619102208494 · Twitter Post