CVE-2026-49754 (GCVE-0-2026-49754)

Vulnerability from cvelistv5 – Published: 2026-06-02 14:15 – Updated: 2026-06-02 19:14
VLAI
Title
HTTP/2 CONTINUATION flood in Mint client via unbounded header-block accumulation
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 (HTTP/2 CONTINUATION flood). When Mint's HTTP/2 receive path observes a HEADERS frame without the END_HEADERS flag, the unparsed header-block fragment is parked in conn.headers_being_processed, 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 max_header_list_size 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 SETTINGS_MAX_FRAME_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.
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: 0.1.0 , < 1.9.0 (semver)
    cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*
 Create a notification for this product.
elixir-mint mint Affected: 596ca4304504be68939c4929e0831557097962b8 , < b662d127d3028b5426c88d4c9cc7fe430491a10b (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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Nothing in the receive path caps the accumulator: there is no per-stream size limit, no \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame-count limit, and \u003ctt\u003emax_header_list_size\u003c/tt\u003e is only enforced on outgoing requests, never on inbound header blocks (its default is \u003ctt\u003e:infinity\u003c/tt\u003e).\u003c/p\u003e\u003cp\u003eA malicious or compromised HTTP/2 server can stream an endless sequence of \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames (each up to the peer-advertised \u003ctt\u003eSETTINGS_MAX_FRAME_SIZE\u003c/tt\u003e) and drive the client\u0027s iolist to arbitrary size, causing memory exhaustion and BEAM process death. A single connection to an attacker-controlled HTTP/2 endpoint is sufficient.\u003c/p\u003e\u003cp\u003eThis issue affects mint: from 0.1.0 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\": \"0.1.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-06-02T19:14:33.100Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-49754\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-02T19:14:33.100Z\", \"dateReserved\": \"2026-06-01T13:45:22.448Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-06-02T14:15:14.951Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





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.