CVE-2026-82672

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Source
https://cve.org/CVERecord?id=CVE-2026-82672
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82672.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-82672
Aliases
Published
2026-09-19T17:00:31Z
Modified
2026-09-22T03:31:09Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Unvalidated chunk-size line tail in Mint HTTP/1 client enables response smuggling against strict intermediaries on pooled connections
Details

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in elixir-mint mint allows a malicious HTTP/1 server to desynchronize a strict intermediary and the Mint client on a pooled connection, enabling response-queue poisoning against subsequent requests that share the connection.

Mint.HTTP1.Parse.chunk_size/1 in lib/mint/http1/parse.ex stops at the first non-hexadecimal byte of a chunked response's chunk-size line and returns the remainder unexamined. Mint.HTTP1.decode_body/5 in lib/mint/http1.ex then discards every byte up to the CRLF with Parse.ignore_until_crlf/1, so the accepted grammar is a run of hex digits followed by arbitrary bytes, where RFC 9112 permits only a ;-introduced chunk extension. Lines such as 5ZZZZZ and 5 9 are accepted as chunk size 5, and 0ZZZZ is accepted as the terminating chunk that ends the message body. An RFC-strict intermediary rejects such a line while Mint accepts it, so the two disagree on chunk boundaries and on where the response ends.

This issue affects mint: from 0.1.0 before 1.10.1.

Database specific 
{
    "cna_assigner":  "EEF",
    "cwe_ids":  [
        "CWE-444"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82672.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "60089586ec7adc9fddb09f69a2f5919ba9ac7f33"
                },
                {
                    "fixed":  "c82377838dc6e275ef40bafa664fbcdf50270c60"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/elixir-mint/mint

Affected ranges

Type
GIT
Repo
https://github.com/elixir-mint/mint
Events
Introduced
47889857fb36f07606ad9c2e52080d202d419058
Fixed
9e9ae10cb6321879b8cf74dea3dd3e91d0e72f41
Fixed
60089586ec7adc9fddb09f69a2f5919ba9ac7f33
Fixed
c82377838dc6e275ef40bafa664fbcdf50270c60
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0.1.0"
        },
        {
            "fixed":  "1.10.1"
        }
    ],
    "source":  [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.1.0
v0.2.0
v0.2.1
v0.4.0
v0.5.0
v1.*
v1.0.0
v1.1.0
v1.10.0
v1.2.0
v1.2.1
v1.3.0
v1.4.0
v1.4.1
v1.4.2
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.6.1
v1.6.2
v1.7.0
v1.7.1
v1.8.0
v1.9.0
v1.9.1
v1.9.2
v1.9.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82672.json"