CVE-2026-32240

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Source
https://cve.org/CVERecord?id=CVE-2026-32240
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32240.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-32240
Aliases
  • GHSA-vpcq-mx5v-32wm
Downstream
Related
Published
2026-03-12T19:35:57Z
Modified
2026-10-21T02:30:34Z
Severity
  • 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
Cap'n Proto: Integer overflow in KJ-HTTP chunk size
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-197",
        "CWE-444"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32240.json"
}
References

Affected packages

Git / github.com/capnproto/capnproto

Affected ranges

Type
GIT
Repo
https://github.com/capnproto/capnproto
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8b892a8a11a632f5d52b877a49728808a142379a
Fixed
2744b3c012b4aa3c31cefb61ec656829fa5c0e36
Fixed
e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:capnproto:capnproto:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.4.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "2744b3c012b4aa3c31cefb61ec656829fa5c0e36"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-32240.json"