VDB
CVE-2026-32240
CVE-2026-32240
PUBLISHED
CVSS 6.300000190734863 MEDIUM
Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk's size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.
EPSS 0.22% · 12.6th percentile
Risk Scores
CVSS 4.0
6.300000190734863
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS Score
0.22%
12.6th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| capnproto | capnproto | < 1.4.0, 0 |
Timeline
- Mar 12, 2026 CVE Published
- Mar 13, 2026 EPSS Score
- Mar 13, 2026 CVE Updated
- Mar 15, 2026 EPSS Score
- Mar 16, 2026 EPSS Score
- Mar 17, 2026 Coalition ESS Score
- Mar 18, 2026 EPSS Score
- Mar 19, 2026 EPSS Score
- Mar 21, 2026 EPSS Score
- Mar 23, 2026 EPSS Score
- Mar 24, 2026 EPSS Score
- May 18, 2026 EPSS Score
References
- https://capnproto.org/capnproto-c++-1.4.0.tar.gz url
- https://capnproto.org/capnproto-c++-win32-1.4.0.zip url
- https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm advisory
- https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36 fix
- https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0 fix