heymrun Heym up to 0.0.69 Fetch Tools server-side request forgery

Summaryinfo

A vulnerability categorized as critical has been discovered in heymrun Heym up to 0.0.69. This issue affects some unknown processing of the component Fetch Tools. Executing a manipulation can lead to server-side request forgery. This vulnerability is handled as CVE-2026-67542. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in heymrun Heym up to 0.0.69. It has been declared as critical. This vulnerability affects an unknown functionality of the component Fetch Tools. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to version 0.0.70, POST /api/mcp/fetch-tools is reachable by any authenticated user (lowest role; no admin/workflow association) and fetches an attacker-supplied URL through the sse and streamable_http transports with no scheme / private-IP / allowlist / redirect guard. The transport error is reflected in the HTTP 422 response, giving a semi-blind SSRF oracle, and the attacker also controls the outbound request headers. This issue has been patched in version 0.0.70.

The advisory is available at github.com. This vulnerability was named CVE-2026-67542 since 07/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available.

Upgrading to version 0.0.70 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• heymrun

Name

• Heym

Version

• 0.0.1
• 0.0.2
• 0.0.3
• 0.0.4
• 0.0.5
• 0.0.6
• 0.0.7
• 0.0.8
• 0.0.9
• 0.0.10
• 0.0.11
• 0.0.12
• 0.0.13
• 0.0.14
• 0.0.15
• 0.0.16
• 0.0.17
• 0.0.18
• 0.0.19
• 0.0.20
• 0.0.21
• 0.0.22
• 0.0.23
• 0.0.24
• 0.0.25
• 0.0.26
• 0.0.27
• 0.0.28
• 0.0.29
• 0.0.30
• 0.0.31
• 0.0.32
• 0.0.33
• 0.0.34
• 0.0.35
• 0.0.36
• 0.0.37
• 0.0.38
• 0.0.39
• 0.0.40
• 0.0.41
• 0.0.42
• 0.0.43
• 0.0.44
• 0.0.45
• 0.0.46
• 0.0.47
• 0.0.48
• 0.0.49
• 0.0.50
• 0.0.51
• 0.0.52
• 0.0.53
• 0.0.54
• 0.0.55
• 0.0.56
• 0.0.57
• 0.0.58
• 0.0.59
• 0.0.60
• 0.0.61
• 0.0.62
• 0.0.63
• 0.0.64
• 0.0.65
• 0.0.66
• 0.0.67
• 0.0.68
• 0.0.69

Website

• Product: https://github.com/heymrun/heym/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion