What is CVE-2026-15311?

CVE-2026-15311 is a low-severity vulnerability in Nousresearch Hermes-agent, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-07-10.

How severe is CVE-2026-15311?

Low severity. CVSS v3 base score is 3.5 out of 10.

RCE in Nousresearch Hermes-agent

CVE-2026-15311

A vulnerability was identified in NousResearch hermes-agent up to 2026.5.29.2. Affected by this issue is the function MatrixAdapter._markdown_to_html of the file gateway/platforms/matrix.py of the component Matrix Adapter. Such manipulatio…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.

Affected products

Nousresearch Hermes-agent — versions 2026.5.29.0, 2026.5.29.1, 2026.5.29.2

Weakness classification (CWE)

References

cna@vuldb.com (product)
cna@vuldb.com (issue-tracking, exploit)
cna@vuldb.com (issue-tracking, patch)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)

Frequently asked questions

What is CVE-2026-15311?: CVE-2026-15311 is a low-severity vulnerability in Nousresearch Hermes-agent, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-07-10.
How severe is CVE-2026-15311?: Low severity. CVSS v3 base score is 3.5 out of 10.