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CVE-2026-54270

protobufjs: Memory amplification from preserved unknown fields in binary decode PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
protobufjs / protobuf.jsaffected >=8.2.0, < 8.5.0

CWE

CWE-770

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.