CVE-2026-49754

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Source
https://cve.org/CVERecord?id=CVE-2026-49754
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-49754.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-49754
Aliases
Published
2026-06-02T14:15:14.951Z
Modified
2026-06-18T03:56:13.126553518Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation
Details

Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client (HTTP/2 CONTINUATION flood).

When Mint's HTTP/2 receive path observes a HEADERS frame without the ENDHEADERS flag, the unparsed header-block fragment is parked in conn.headersbeingprocessed, and every subsequent CONTINUATION frame on that stream is appended to the accumulator. Nothing in the receive path caps the accumulator: there is no per-stream size limit, no CONTINUATION frame-count limit, and maxheaderlistsize is only enforced on outgoing requests, never on inbound header blocks (its default is :infinity).

A malicious or compromised HTTP/2 server can stream an endless sequence of CONTINUATION frames (each up to the peer-advertised SETTINGSMAXFRAME_SIZE) and drive the client's iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.

This issue affects mint: from 0.1.0 before 1.9.0.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49754.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "596ca4304504be68939c4929e0831557097962b8"
                },
                {
                    "fixed": "b662d127d3028b5426c88d4c9cc7fe430491a10b"
                }
            ]
        }
    ],
    "cwe_ids": [
        "CWE-770"
    ],
    "cna_assigner": "EEF"
}
References

Affected packages

Git / github.com/elixir-mint/mint

Affected ranges

Type
GIT
Repo
https://github.com/elixir-mint/mint
Events
Introduced
47889857fb36f07606ad9c2e52080d202d419058
Fixed
d1c8c5cafdfe5d3fdf1e42a2d0594d26855a12a1
Fixed
b662d127d3028b5426c88d4c9cc7fe430491a10b
Database specific 
{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0.1.0"
        },
        {
            "fixed": "1.9.0"
        }
    ]
}

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
v1.2.0
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

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-49754.json"