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yifancong
approved these changes
Jan 8, 2026
Merged
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This PR contains the following updates:
1.25.1→1.25.2GitHub Vulnerability Alerts
CVE-2026-0621
Impact
A ReDoS vulnerability in the
UriTemplateclass allows attackers to cause denial of service. ThepartToRegExp()function generates a regex pattern with nested quantifiers (([^/]+(?:,[^/]+)*)) for exploded template variables (e.g.,{/id*},{?tags*}), causing catastrophic backtracking on malicious input.Who is affected: MCP servers that register resource templates with exploded array patterns and accept requests from untrusted clients.
Attack result: An attacker sends a crafted URI via
resources/readrequest, causing 100% CPU utilization, server hang/crash, and denial of service for all clients.Affected Versions
All versions of
@modelcontextprotocol/sdkprior to the patched release.Patches
v1.25.2 contains b392f02ffcf37c088dbd114fedf25026ec3913d3 the fix modifies the regex pattern to prevent backtracking.
Workarounds
{/id*},{?tags*}) in resource templatesRelease Notes
modelcontextprotocol/typescript-sdk (@modelcontextprotocol/sdk)
v1.25.2Compare Source
What's Changed
New Contributors
Full Changelog: modelcontextprotocol/typescript-sdk@1.25.1...v1.25.2
Configuration
📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
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