Numeric Truncation Error Affecting capnproto/capnproto package, versions [,1.4.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-CAPNPROTOCAPNPROTO-15607239
- published15 Mar 2026
- disclosed12 Mar 2026
- creditHO9, HanJeouk
Introduced: 12 Mar 2026
CVE-2026-32240 (opens in a new tab)How to fix?
Upgrade capnproto/capnproto to version 1.4.0 or higher.
Overview
Affected versions of this package are vulnerable to Numeric Truncation Error in the chunk size parsing process when handling HTTP requests with Transfer-Encoding set to chunked. An attacker can cause HTTP request or response smuggling by sending a chunk size value that parses to 2^64 or larger, which is then truncated to a 64-bit integer.