CVE-2026-48862

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Source
https://cve.org/CVERecord?id=CVE-2026-48862
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48862.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-48862
Aliases
Published
2026-06-02T14:15:10Z
Modified
2026-08-12T03:51:49Z
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
Unbounded conn.streams growth in Mint HTTP/2 client via unenforced PUSH_PROMISE concurrency
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 via PUSH_PROMISE flooding.

In lib/mint/http2.ex, Mint.HTTP2.decode_push_promise_headers_and_add_response/5 inserts a :reserved_remote entry into conn.streams for every promised stream ID. The neighbouring Mint.HTTP2.assert_valid_promised_stream_id/2 only verifies that the promised ID is even and not already present; client_settings.max_concurrent_streams is not consulted at promise time. The concurrency cap is only checked when the response HEADERS for the promised stream arrive, so a server that emits PUSH_PROMISE frames and withholds the matching HEADERS never trips that check.

HTTP/2 server push is accepted by default (client_settings.enable_push defaults to true). A single long-lived HTTP/2 connection to a hostile server lets that server pin one conn.streams entry per PUSH_PROMISE frame it sends, with no upper bound, until the client process runs out of memory.

This issue affects mint: from 0.2.0 before 1.9.0.

Database specific 
{
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48862.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "65c6394d05a1b8aa4a7461708c3aa173e8d7a5cf"
                },
                {
                    "fixed": "70b97b6a5209fb288b0e04d8e657dda26c59de67"
                }
            ],
            "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
8d3152c6409146b861b800a1fc804fff24f4a226
Fixed
d1c8c5cafdfe5d3fdf1e42a2d0594d26855a12a1
Fixed
70b97b6a5209fb288b0e04d8e657dda26c59de67
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0.2.0"
        },
        {
            "fixed": "1.9.0"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

v0.*
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/cve-osv-conversion/osv-output/CVE-2026-48862.json"