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: 'error' protection. A decoded map containing a __proto__ ke…
Exact source revision recorded 9 Nov 2026 05:07:39 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-95112
Publishedmsgpack5 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: 'error' protection. A decoded map containing a __proto__ key can then replace the decoded object'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.
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
Original publisher date fields
datePublished: Oct 8, 2026, 5:13:00 PM
dateUpdated: Oct 14, 2026, 1:02:53 AM
1 related source bulletins · separate from aliases
msrc_CVE-2026-107301: msgpack5: Partial options disable prototype protection
CVE-2026-107301
- Source published
- Oct 8, 2026, 5:13:00 PM (timezone not stated)
- Source modified
- Oct 14, 2026, 1:02:53 AM (timezone not stated)
- Observed here
- 9 Nov 2026 05:07:39 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.
EUVD CVSS 3.1 · 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L