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CVE PROGRAM SOURCE RECORD6.3 Medium

CVE-2026-32239

Cap'n Proto has an integer overflow in KJ-HTTP

Description

Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length value was converted to unsigned, treating it as an impossibly large length instead. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

capnproto capnproto

  • < 1.4.0affected

References