EEF-CVE-2026-48862
- Source
- https://cna.erlef.org/osv/EEF-CVE-2026-48862.html
- Import Source
- https://cna.erlef.org/osv/EEF-CVE-2026-48862.json
- JSON Data
- https://api.osv.dev/v1/vulns/EEF-CVE-2026-48862
- Aliases
-
- CVE-2026-48862
- GHSA-g586-ccqf-7x4r
- Published
- 2026-06-02T14:15:10.591Z
- Modified
- 2026-06-02T19:14:09.683Z
- 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
-
Summary
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.decodepushpromiseheadersandaddresponse/5 inserts a :reservedremote entry into conn.streams for every promised stream ID. The neighbouring Mint.HTTP2.assertvalidpromisedstreamid/2 only verifies that the promised ID is even and not already present; clientsettings.maxconcurrentstreams 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 (clientsettings.enablepush 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.
Workaround
Disable HTTP/2 server push on connections to untrusted servers by passing clientsettings: [enablepush: false] to Mint.HTTP.connect/4. This makes Mint reject any inbound PUSHPROMISE frame with a PROTOCOLERROR before the vulnerable code path is reached.
- Database specific
{ "cpe_ids": [ "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*" ], "capec_ids": [ "CAPEC-130" ], "cwe_ids": [ "CWE-770" ] }- References
- Credits
-
-
- Peter Ullrich - FINDER
-
- Eric Meadows-Jönsson - REMEDIATION_DEVELOPER
-
- Jonatan Männchen / EEF - ANALYST
-
Affected packages
Hex / mint
Package
- Name
- mint
- Purl
- pkg:hex/mint