CVE-2026-54270
CVE-2026-54270 · protobufjs: Memory amplification from preserved unknown fields in binary decode
This page contains facts from public vulnerability sources. Check the original advisory before updating.
protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 to 8.4.2, protobufjs preserved unknown wire elements in message.$unknowns and did not provide a decode-time option to discard unknown fields before retaining them. A crafted protobuf payload containing many unknown fields could therefore cause a decoded message to retain substantially more memory than the input size would suggest, even when unknown-field round-tripping is not needed. protobufjs 8.5.0 added the relevant decode-time options, allowing applications that decode untrusted protobuf data to disable unknown-field retention during decode. protobufjs 8.6.2 flips the default so unknown fields are discarded unless explicitly opted into.
CVSS 5.3 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
protobuf.js
- Versions
- >=8.2.0, < 8.5.0: Affected
No fix published
protobufjs npm
- Affected ranges
- SEMVER: ≥ 8.2.0, < 8.5.0
Update to 8.5.0