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CVE-2026-59876

protobufjs: Text Format string map parsing can mutate returned map object prototype PUBLISHED

Description (CNA)

protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key __proto__ to change the prototype of the returned map object instead of creating an own map entry in protobufjs/ext/textformat. This issue is fixed in version 8.6.5.

Affected (CNA)

Vendor / productVersions
protobufjs / protobuf.jsaffected >= 8.2.0, < 8.6.5

CWE

CWE-1321

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.