SUSE alert openSUSE-SU-2026:21062-1 (capnproto)

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openSUSE-SU-2026:21062-1: moderate: Security update for capnproto
Date:
             
 
Tue, 30 Jun 2026 09:48:10 +0200
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<20260630074810.4A782FF48@maintenance.suse.de>
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Article
openSUSE security update: security update for capnproto
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:21062-1
Rating: moderate
References:

  * bsc#1259638
  * bsc#1259639



Cross-References:

  * CVE-2026-32239
  * CVE-2026-32240



CVSS scores:

  * CVE-2026-32239 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  * CVE-2026-32239 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-32240 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  * CVE-2026-32240 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Affected Products:

         openSUSE Leap 16.0

-------------------------------------------------------------

An update that solves 2 vulnerabilities and has 2 bug fixes can now be installed.

Description:

This update for capnproto fixes the following issues:

Update to version 1.4.0.

Security issues fixed:

- CVE-2026-32239: negative `Content-Length` conversion treated as impossibly large length by
KJ-HTTP can lead to HTTP
  smuggling (bsc#1259638).
- CVE-2026-32240: integer overflow when KJ-HTTP `Transfer-Encoding` chunk size is parsed to a value
of 2^64 or larger
  can lead to HTTP smuggling (bsc#1259639).

Other updates and bugfixes:

- Have `stdcoro` use `::std` namespace.
- Disable stack check when HWASan is used.
- Fix benign buffer overrun in async `readMessage()`.
- Shared library naming changes from `libsomething-%{version}.so` to `libsomething.so.%{version}`.


Patch instructions:

   To install this openSUSE security update use the suse recommended installation methods
   like YaST online_update or "zypper patch".
   Alternatively you can run the command listed for your product:

- openSUSE Leap 16.0

   zypper in -t patch openSUSE-Leap-16.0-1083=1

Package List:

- openSUSE Leap 16.0:

  capnproto-1.4.0-160000.1.1
  libcapnp-1_4_0-1.4.0-160000.1.1
  libcapnp-devel-1.4.0-160000.1.1

References:

  * https://www.suse.com/security/cve/CVE-2026-32239.html
  * https://www.suse.com/security/cve/CVE-2026-32240.html