Unrated severityNVD Advisory· Published Mar 12, 2026· Updated Mar 13, 2026
Cap'n Proto has an integer overflow in KJ-HTTP
CVE-2026-32239
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
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
5- capnproto.org/capnproto-c++-1.4.0.tar.gzmitrex_refsource_MISC
- capnproto.org/capnproto-c++-win32-1.4.0.zipmitrex_refsource_MISC
- github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36mitrex_refsource_MISC
- github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0mitrex_refsource_MISC
- github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpmmitrex_refsource_CONFIRM
News mentions
0No linked articles in our index yet.