PT-2026-41128 · Unknown · Mcp Registry

Rdimitrov · Published 2026-05-14 · Updated 2026-05-20 · CVE-2026-45781

Positive Technologies (AI Summary)

CVSS v3.1

3.5

Low

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions MCP Registry versions prior to 1.7.9

Description OCI ownership validation fails to perform a label-match check when an upstream OCI registry returns an HTTP 429 (Too Many Requests) error. This occurs because the function ValidateOCI() in the file internal/validators/registries/oci.go fails open during rate-limiting events. Consequently, any authenticated publisher can bind their io.github.<user>/* namespace to OCI images they do not control, bypassing the io.modelcontextprotocol.server.name label-match check, which serves as the sole cross-system ownership proof for OCI packages.

Recommendations Update to version 1.7.9.

Exploit

Fix

Weakness Enumeration

CWE-636

Related Identifiers

CVE-2026-45781

GHSA-2V5F-5R6W-P67R

GO-2026-5008

Affected Products

Mcp Registry

References · 7

• 🔥 https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-2v5f-5r6w-p67r · Exploit
• https://osv.dev/vulnerability/GO-2026-5008 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-45781 · Security Note
• https://osv.dev/vulnerability/GHSA-2v5f-5r6w-p67r · Vendor Advisory
• https://github.com/modelcontextprotocol/registry · Note
• https://twitter.com/CVEnew/status/2055074220728586697 · Twitter Post
• https://t.me/CVEtracker/53846 · Telegram Post