capnproto: Cap'n Proto is a data interchange format and capability-based RPC system
CVE-2026-32240 is fixed in 6 products on 1 platform, first by capnproto 0.6.1-1ubuntu1+esm1, released March 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| capnproto · Debian 14 | 1.4.0-2 | DEBIAN-CVE-2026-32240 | Mar 12, 2026 |
| capnproto · Ubuntu 18.04.6 LTS (bionic) | 0.6.1-1ubuntu1+esm1 | capnproto 0.6.1-1ubuntu1+esm1 | Mar 12, 2026 |
| capnproto · Ubuntu 20.04 LTS (focal) | 0.7.0-6ubuntu0.1~esm1 | capnproto 0.7.0-6ubuntu0.1~esm1 | Mar 12, 2026 |
| capnproto · Ubuntu 22.04.1 LTS (jammy) | 0.8.0-2ubuntu2+esm1 | capnproto 0.8.0-2ubuntu2+esm1 | Mar 12, 2026 |
| capnproto · Ubuntu 24.04.5 LTS (noble) | 1.0.1-4ubuntu0.1~esm1 | capnproto 1.0.1-4ubuntu0.1~esm1 | Mar 12, 2026 |
| capnproto · Ubuntu 26.04.1 LTS (resolute) | 1.1.0-2.1ubuntu0.1~esm1 | capnproto 1.1.0-2.1ubuntu0.1~esm1 | Mar 12, 2026 |
| capnproto · opensuse-leap 16.0 | 1.4.0-160000.1.1 | OPENSUSE-SU-2026:21062-1 | Jun 26, 2026 |
| libcapnp-0.6.1 · Ubuntu 18.04.6 LTS (bionic) | 0.6.1-1ubuntu1+esm1 | libcapnp-0.6.1 0.6.1-1ubuntu1+esm1 | Mar 12, 2026 |
| libcapnp-0.7.0 · Ubuntu 20.04 LTS (focal) | 0.7.0-6ubuntu0.1~esm1 | libcapnp-0.7.0 0.7.0-6ubuntu0.1~esm1 | Mar 12, 2026 |
| libcapnp-0.8.0 · Ubuntu 22.04.1 LTS (jammy) | 0.8.0-2ubuntu2+esm1 | libcapnp-0.8.0 0.8.0-2ubuntu2+esm1 | Mar 12, 2026 |
| libcapnp-1.0.1 · Ubuntu 24.04.5 LTS (noble) | 1.0.1-4ubuntu0.1~esm1 | libcapnp-1.0.1 1.0.1-4ubuntu0.1~esm1 | Mar 12, 2026 |
| libcapnp-1.1.0 · Ubuntu 26.04.1 LTS (resolute) | 1.1.0-2.1ubuntu0.1~esm1 | libcapnp-1.1.0 1.1.0-2.1ubuntu0.1~esm1 | Mar 12, 2026 |
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