Packages
- capnproto - Fast data interchange format and capability-based RPC system
Details
Chanho Kim and Jihyeok Han discovered that Cap'n Proto incorrectly
handled negative Content-Length values or excessively large chunk sizes
when processing HTTP messages. An attacker could possibly use these
issues to cause HTTP messages to be interpreted inconsistently,
resulting in HTTP request or response smuggling. (CVE-2026-32239,
CVE-2026-32240)
Chanho Kim and Jihyeok Han discovered that Cap'n Proto incorrectly
handled negative Content-Length values or excessively large chunk sizes
when processing HTTP messages. An attacker could possibly use these
issues to cause HTTP messages to be interpreted inconsistently,
resulting in HTTP request or response smuggling. (CVE-2026-32239,
CVE-2026-32240)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | libcapnp-1.1.0 – 1.1.0-2.1ubuntu0.1~esm1 | ||
| libcapnp-dev – 1.1.0-2.1ubuntu0.1~esm1 | |||
| 24.04 LTS noble | libcapnp-1.0.1 – 1.0.1-4ubuntu0.1~esm1 | ||
| libcapnp-dev – 1.0.1-4ubuntu0.1~esm1 | |||
| 22.04 LTS jammy | libcapnp-0.8.0 – 0.8.0-2ubuntu2+esm1 | ||
| libcapnp-dev – 0.8.0-2ubuntu2+esm1 | |||
| 20.04 LTS focal | libcapnp-0.7.0 – 0.7.0-6ubuntu0.1~esm1 | ||
| libcapnp-dev – 0.7.0-6ubuntu0.1~esm1 | |||
| 18.04 LTS bionic | libcapnp-0.6.1 – 0.6.1-1ubuntu1+esm1 | ||
| libcapnp-dev – 0.6.1-1ubuntu1+esm1 | |||
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