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CVE-2026-32240

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c1c16e620168e6690746dd975bae19ddc526faf936f8886a88b55045da73593c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-197","description":"CWE-197: Numeric Truncation Error","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-444","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"capnproto","vendor":"capnproto","versions":[{"status":"affected","version":"< 1.4.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-197","description":"CWE-197: Numeric Truncation Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-444","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/problemTypes/1/descriptions/0

Source references

5 source assertions
{"name":"https://capnproto.org/capnproto-c++-1.4.0.tar.gz","tags":["x_refsource_MISC"],"url":"https://capnproto.org/capnproto-c++-1.4.0.tar.gz"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/references/3
{"name":"https://capnproto.org/capnproto-c++-win32-1.4.0.zip","tags":["x_refsource_MISC"],"url":"https://capnproto.org/capnproto-c++-win32-1.4.0.zip"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/references/4
{"name":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36","tags":["x_refsource_MISC"],"url":"https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/references/1
{"name":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0","tags":["x_refsource_MISC"],"url":"https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/references/2
{"name":"https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21fda2e0d2187b206e5f6caa68ba4609b35375d81c4d417cad1f32e6ee45c9e8 · sha256:e753426509e1c555… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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