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VulnerabilityPublished

CVE-2026-67542: heymrun heym · Server-Side Request Forgery

Affects heymrun heymSource CVE Database V5

0
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Not known to be exploited · CVSS 7.1 High : upgrade to 0.0.70 soon.

Data as of 11 Nov 2026, 22:04 UTC

CVSS 3.1 base score
7.1High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.17.1
Patch
Available – fixed in 0.0.70
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Upgrade heymrun heym to 0.0.70.

Affected software

ProductAffectedFixed in
heymrunheymAffected
  • <0.0.70
Fixed in
  • 0.0.70

AI-suggested

Upgrade heymrun heym to version 0.0.70 or later, where this SSRF vulnerability is patched. No other mitigation is required as the vendor has provided an official fix.

Description

A Server-Side Request Forgery (SSRF) vulnerability exists in heymrun heym versions prior to 0.0.70. Authenticated users with the lowest role can access the POST /api/mcp/fetch-tools endpoint, which fetches attacker-supplied URLs without proper validation or allowlisting. The vulnerability allows attackers to control outbound request headers and gain a semi-blind SSRF oracle via error reflection in HTTP 422 responses. This issue is fixed in version 0.0.70.

References

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