CVE-2026-48862 (GCVE-0-2026-48862)

Vulnerability from cvelistv5 – Published: 2026-06-02 14:15 – Updated: 2026-06-02 19:14
VLAI
Title
Unbounded conn.streams growth in Mint HTTP/2 client via unenforced PUSH_PROMISE concurrency
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.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.
Severity
8.2 (High)
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
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
EEF
References
Impacted products
Vendor Product Version
elixir-mint mint Affected: 0.2.0 , < 1.9.0 (semver)
    cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*
 Create a notification for this product.
elixir-mint mint Affected: 65c6394d05a1b8aa4a7461708c3aa173e8d7a5cf , < 70b97b6a5209fb288b0e04d8e657dda26c59de67 (git)
    cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
Peter Ullrich Eric Meadows-Jönsson Jonatan Männchen / EEF
Show details on NVD website
To clipboard 

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This makes Mint reject any inbound PUSH_PROMISE frame with a PROTOCOL_ERROR before the vulnerable code path is reached.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eDisable HTTP/2 server push on connections to untrusted servers by passing \u003ctt\u003eclient_settings: [enable_push: false]\u003c/tt\u003e to \u003ctt\u003e\u0027Elixir.Mint.HTTP\u0027:connect/4\u003c/tt\u003e. This makes Mint reject any inbound \u003ctt\u003ePUSH_PROMISE\u003c/tt\u003e frame with a \u003ctt\u003ePROTOCOL_ERROR\u003c/tt\u003e before the vulnerable code path is reached.\u003c/p\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\\n\\nIn 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.\\n\\nHTTP/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.\\n\\nThis issue affects mint: from 0.2.0 before 1.9.0.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"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.\u003cp\u003eIn \u003ctt\u003elib/mint/http2.ex\u003c/tt\u003e, \u003ctt\u003e\u0027Elixir.Mint.HTTP2\u0027:decode_push_promise_headers_and_add_response/5\u003c/tt\u003e inserts a \u003ctt\u003e:reserved_remote\u003c/tt\u003e entry into \u003ctt\u003econn.streams\u003c/tt\u003e for every promised stream ID. The neighbouring \u003ctt\u003e\u0027Elixir.Mint.HTTP2\u0027:assert_valid_promised_stream_id/2\u003c/tt\u003e only verifies that the promised ID is even and not already present; \u003ctt\u003eclient_settings.max_concurrent_streams\u003c/tt\u003e is not consulted at promise time. The concurrency cap is only checked when the response \u003ctt\u003eHEADERS\u003c/tt\u003e for the promised stream arrive, so a server that emits \u003ctt\u003ePUSH_PROMISE\u003c/tt\u003e frames and withholds the matching \u003ctt\u003eHEADERS\u003c/tt\u003e never trips that check.\u003c/p\u003e\u003cp\u003eHTTP/2 server push is accepted by default (\u003ctt\u003eclient_settings.enable_push\u003c/tt\u003e defaults to \u003ctt\u003etrue\u003c/tt\u003e). A single long-lived HTTP/2 connection to a hostile server lets that server pin one \u003ctt\u003econn.streams\u003c/tt\u003e entry per \u003ctt\u003ePUSH_PROMISE\u003c/tt\u003e frame it sends, with no upper bound, until the client process runs out of memory.\u003c/p\u003e\u003cp\u003eThis issue affects mint: from 0.2.0 before 1.9.0.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.9.0\", \"versionStartIncluding\": \"0.2.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-06-02T19:14:09.683Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-48862\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-02T19:14:09.683Z\", \"dateReserved\": \"2026-05-25T20:44:10.697Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-06-02T14:15:10.591Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.