CVE-2026-32239
Cap'n Proto has an integer overflow in KJ-HTTP
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-444 CWE-190 |
| Vendor | capnproto |
| Product | capnproto |
| Published | Mar 12, 2026 |
| Last Updated | Mar 13, 2026 |
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Affected Versions
capnproto / capnproto
< 1.4.0
References
github.com: https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm github.com: https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36 github.com: https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0 capnproto.org: https://capnproto.org/capnproto-c++-1.4.0.tar.gz capnproto.org: https://capnproto.org/capnproto-c++-win32-1.4.0.zip