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CVE-2026-32239VulnerabilityPublished Updated

SUSE · Security update for capnproto

Affects SUSESource GCVE Database

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Mentioned vulnerabilities

Not known to be exploited.

Data as of 31 Oct 2026, 20:20 UTC

Severity
Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
SUSE Product Security Team SUSEAffected
  • SUSE
  • aarch64
  • capnproto-1.4.0-160000.1.1.aarch64
  • libcapnp-1_4_0-1.4.0-160000.1.1.aarch64
  • libcapnp-devel-1.4.0-160000.1.1.aarch64
  • capnproto-0:1.4.0-160000.1.1.aarch64
  • libcapnp-1_4_0-0:1.4.0-160000.1.1.aarch64
  • libcapnp-devel-0:1.4.0-160000.1.1.aarch64
Fixed in–

AI-suggested

Upgrade to capnproto version 1.4.0, which contains fixes for the identified vulnerabilities. No other specific mitigations are indicated. Patch status is confirmed by the vendor update. There is no indication that the vulnerabilities are mitigated without applying this update.

Description

This security update for capnproto addresses two vulnerabilities related to HTTP smuggling caused by improper handling of HTTP header values in KJ-HTTP. The first vulnerability (CVE-2026-32239) involves a negative Content-Length conversion treated as an impossibly large length, and the second (CVE-2026-32240) involves an integer overflow when parsing Transfer-Encoding chunk sizes of 2^64 or larger. The update also includes other bug fixes and improvements.

References

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