CVE-2026-18775

NousResearch hermes-agent Browser Tooling browser_tool.py browser_snapshot server-side request forgery

Published Aug 4, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed

Description

A vulnerability has been found in NousResearch hermes-agent up to 0.16.0. This vulnerability affects the function browser_snapshot of the file tools/browser_tool.py of the component Browser Tooling. Such manipulation leads to server-side request forgery. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Analysis

Technical impact

The vulnerability allows an attacker to manipulate the browser_snapshot function in Browser Tooling, enabling server‑side request forgery (SSRF). An exploited server can issue arbitrary HTTP requests, potentially accessing internal systems or sensitive data. This flaw is classified as CWE‑918, reflecting insufficient validation of request destinations.

Affected Systems

The affected product is NousResearch hermes‑agent, versions up to 0.16.0. The flaw resides in the tools/browser_tool.py component of the Browser Tooling module.

Risk and Exploitability

The CVSS score is 5.3, indicating moderate severity. EPSS is not available and the vulnerability is not listed in the CISA KEV catalog. The attack can be launched remotely, and the exploit has already been disclosed publicly, which may lead to opportunistic exploitation by threat actors.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

NousResearch

hermes-agent

affected

Version	Status	Constraints
`0.1`	affected	—
`0.2`	affected	—
`0.3`	affected	—
`0.4`	affected	—
`0.5`	affected	—
`0.6`	affected	—
`0.7`	affected	—
`0.8`	affected	—
`0.9`	affected	—
`0.10`	affected	—
`0.11`	affected	—
`0.12`	affected	—
`0.13`	affected	—
`0.14`	affected	—
`0.15`	affected	—
`0.16.0`	affected	—

No data.

Vendor Product Versions

Nousresearch

Hermes-agent

Version	Status	Scheme	Platform
`0.1`	affected	generic	—
`0.2`	affected	generic	—
`0.3`	affected	generic	—
`0.4`	affected	generic	—
`0.5`	affected	generic	—
`0.6`	affected	generic	—
`0.7`	affected	generic	—
`0.8`	affected	generic	—
`0.9`	affected	generic	—
`0.10`	affected	generic	—
`0.11`	affected	generic	—
`0.12`	affected	generic	—
`0.13`	affected	generic	—
`0.14`	affected	generic	—
`0.15`	affected	generic	—
`0.16.0`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Obtain and install the latest hermes‑agent release once a vendor patch is issued.
If a patch is unavailable, block hermes‑agent’s outbound traffic to internal networks using firewall or proxy rules to mitigate SSRF.
Configure the application to disable the browser_snapshot feature or modify the code to validate target URLs before request execution.
Monitor server logs for unexpected outbound HTTP requests originating from hermes‑agent to detect potential abuse.

Generated by OpenCVE AI on August 4, 2026 at 19:27 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication Single

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.378% probability within 30 days)

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
https://gist.github.com/YLChen-007/2e5bf7fa58113967807425032234cc89
https://vuldb.com/cve/CVE-2026-18775
https://vuldb.com/submit/856877
https://vuldb.com/vuln/385785
https://vuldb.com/vuln/385785/cti

History

Aug 4, 2026 8:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Aug 4, 2026 4:30 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A vulnerability has been found in NousResearch hermes-agent up to 0.16.0. This vulnerability affects the function browser_snapshot of the file tools/browser_tool.py of the component Browser Tooling. Such manipulation leads to server-side request forgery. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Title		NousResearch hermes-agent Browser Tooling browser_tool.py browser_snapshot server-side request forgery
First Time appeared		Nousresearch Nousresearch hermes-agent
Weaknesses		CWE-918
CPEs		cpe:2.3:a:nousresearch:hermes-agent::::::::
Vendors & Products		Nousresearch Nousresearch hermes-agent
References		https://gist.github.com/YLChen-007/2e5bf7fa58113967807425032234cc89 https://vuldb.com/cve/CVE-2026-18775 https://vuldb.com/submit/856877 https://vuldb.com/vuln/385785 https://vuldb.com/vuln/385785/cti
Metrics		cvssV2_0 `{'score': 6.5, 'vector': 'AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR'}` cvssV3_0 `{'score': 6.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}` cvssV3_1 `{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}` cvssV4_0 `{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}`

Subscriptions

Nousresearch Hermes-agent

Weaknesses

CWE-918
Server-Side Request Forgery (SSRF)

Sources

CVE record Updated: Aug 4, 2026, 7:51 PM

Status: PUBLISHED
Assigner: VulDB
Published: Aug 4, 2026, 4:15 PM
Updated: Aug 4, 2026, 7:51 PM
Reserved: Aug 4, 2026, 7:35 AM

View source JSON

Vulnrichment Updated: Aug 4, 2026, 7:16 PM

Updated: Aug 4, 2026, 7:16 PM

JSON

NVD Updated: Oct 24, 2026, 4:10 PM

Status: Deferred
Published: Aug 4, 2026, 5:16 PM
Modified: Oct 24, 2026, 4:10 PM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment Updated: Aug 4, 2026, 8:00 PM

Updated: Aug 4, 2026, 8:00 PM

JSON

Analysis

Technical impact

Affected Systems

Risk and Exploitability

Affected Products

Remediation

Tracking

Advisories

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication Single

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

Exploitation poc

Automatable no

Technical Impact partial

Subscriptions

Sources

JSON object

JSON object

JSON object

JSON object

JSON object