CVE-2026-126406

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Source
https://cve.org/CVERecord?id=CVE-2026-126406
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126406.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-126406
Aliases
Downstream
Published
2026-11-13T09:35:44Z
Modified
2026-11-15T02:31:04Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Wasmtime before 36.0.20 HTTP Request Smuggling via wasi-http p2 Content-Length
Details

The wasmtime-wasi-http p2 implementation in Wasmtime before 36.0.20, 37.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 can send conflicting content-length headers, or ones not matching the body, in outgoing requests. A guest that reuses a received response's headers resource to send a bodyless request can enable request smuggling against non-compliant servers, potentially bypassing embedder destination access controls.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-444"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126406.json"
}
References

Affected packages

Git / github.com/bytecodealliance/wasmtime

Affected ranges

Type
GIT
Repo
https://github.com/bytecodealliance/wasmtime
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
b265f78b1e92e12240ec7bdc21c7a559d2df968e
Introduced
7b3d6ae79e9153a2477668062f5622c10333925f
Fixed
7b6c29ec3e9a49c97da231665cbd8eead9ccbda0
Introduced
17830bd3c0331d920a8aa38846eebc4d46d98c23
Fixed
805a0f15320e8836cf2b9f001b53d884bf866c89
Introduced
ebe5e8df1f4e12c5fc2f5954926881d8d61367d8
Fixed
c307ec81de02852d815e9849f7c89d955c03c30d
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "36.0.20"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "37.0.0"
                },
                {
                    "fixed": "48.0.8"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "49.0.0"
                },
                {
                    "fixed": "49.0.5"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "50.0.0"
                },
                {
                    "fixed": "50.0.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        }
    ]
}

Affected versions

cranelift-v0.*
cranelift-v0.60.0
cranelift-v0.61.0
cranelift-v0.69.0
v0.*
v0.12.0
v0.16.0
v0.17.0
v0.18.0
v0.19.0
v0.20.0
v0.21.0
v0.22.0
v0.23.0
v0.24.0
v0.25.0
v0.26.0
v0.27.0
v0.28.0
v0.29.0
v0.30.0
v0.31.0
v0.32.0
v0.33.0
v0.34.0
v0.35.0
v36.*
v36.0.0
v36.0.1
v36.0.10
v36.0.11
v36.0.12
v36.0.13
v36.0.14
v36.0.15
v36.0.16
v36.0.17
v36.0.18
v36.0.19
v36.0.2
v36.0.3
v36.0.4
v36.0.5
v36.0.6
v36.0.7
v36.0.8
v36.0.9
v48.*
v48.0.0
v48.0.1
v48.0.2
v48.0.3
v48.0.4
v48.0.5
v48.0.6
v48.0.7
v49.*
v49.0.0
v49.0.1
v49.0.2
v49.0.3
v49.0.4
v50.*
v50.0.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126406.json"