https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Fri, 09 Oct 2026 14:34:40 +0000 https://vulnerability.circl.lu/vuln/fkie_cve-2026-107301 <p>msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, constructing msgpack5 with an empty or partial options object disables the default protoAction: &#39;error&#39; protection. A decoded map containing a __proto__ key can then replace the decoded object&#39;s prototype, potentially changing inherited properties or downstream behavior, although Object.prototype is not modified globally. This issue is fixed in version 6.1.0.</p> <p>msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, constructing msgpack5 with an empty or partial options object disables the default protoAction: &#39;error&#39; protection. A decoded map containing a __proto__ key can then replace the decoded object&#39;s prototype, potentially changing inherited properties or downstream behavior, although Object.prototype is not modified globally. This issue is fixed in version 6.1.0.</p> https://vulnerability.circl.lu/vuln/fkie_cve-2026-107301 https://vulnerability.circl.lu/vuln/ghsa-8hq7-ggx2-cc6m <p><strong>Affected:</strong> npm: msgpack5</p> <p>### Impact</p> <p>Passing an empty or partial options object disables the default `protoAction: &#39;error&#39;` protection. A map containing a `__proto__` key can then replace the prototype of the decoded object, potentially changing inherited properties or causing unexpected behavior in downstream code.</p> <p>Only the decoded object&#39;s prototype is affected; this does not modify `Object.prototype` globally.</p> <p>### Patches</p> <p>Options are now merged with secure defaults without modifying the caller&#39;s object. Unsupported `protoAction` values are rejected.</p> <p>### Workarounds</p> <p>Explicitly set `protoAction: &#39;error&#39;` whenever constructing a msgpack5 instance, and validate decoded values before use.</p> <p><strong>Affected:</strong> npm: msgpack5</p> <p>### Impact</p> <p>Passing an empty or partial options object disables the default `protoAction: &#39;error&#39;` protection. A map containing a `__proto__` key can then replace the prototype of the decoded object, potentially changing inherited properties or causing unexpected behavior in downstream code.</p> <p>Only the decoded object&#39;s prototype is affected; this does not modify `Object.prototype` globally.</p> <p>### Patches</p> <p>Options are now merged with secure defaults without modifying the caller&#39;s object. Unsupported `protoAction` values are rejected.</p> <p>### Workarounds</p> <p>Explicitly set `protoAction: &#39;error&#39;` whenever constructing a msgpack5 instance, and validate decoded values before use.</p> https://vulnerability.circl.lu/vuln/ghsa-8hq7-ggx2-cc6m