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    <link>https://cve.radiocsirt.org</link>
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    <lastBuildDate>Wed, 07 Oct 2026 00:59:13 +0000</lastBuildDate>
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      <title>CVE-2026-48862 — Unbounded conn.streams growth in Mint HTTP/2 client via unenforced PUSH_PROMISE concurrency</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-48862</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; elixir-mint mint&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;This issue affects mint: from 0.2.0 before 1.9.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; elixir-mint mint&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;This issue affects mint: from 0.2.0 before 1.9.0.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-48862</guid>
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