CVE-2026-74858: jae-jae fetcher-mcp URL Validation security-credentials fetch_urls server-side request forgery

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-17 · updated 2026-08-20
Weakness: CWE-918

Description

A vulnerability has been found in jae-jae fetcher-mcp up to 0.3.9. Impacted is the function fetch_url/fetch_urls of the file /latest/meta-data/iam/security-credentials/ of the component URL Validation. Such manipulation leads to server-side request forgery. It is possible to launch the attack remotely. The project was informed of the problem early through an issue report but has not responded yet.

Affected products

jae-jae fetcher-mcp: 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5 (+4)

References

https://github.com/jae-jae/fetcher-mcp/
https://github.com/jae-jae/fetcher-mcp/issues/37
https://vuldb.com/cve/CVE-2026-74858
https://vuldb.com/submit/876015
https://vuldb.com/vuln/391221
https://vuldb.com/vuln/391221/cti

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