CVE-2026-69664 (GCVE-0-2026-69664)

Vulnerability from cvelistv5 – Published: 2026-09-01 14:59 – Updated: 2026-09-01 17:45
VLAI
Title
httpd parks a request worker indefinitely on a malformed chunk size sent after the headers
Summary
Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by sending a request with a chunked body whose chunk-size line is not a hexadecimal number. The worker serving the connection is never released and no timeout reclaims it, so repeating the request across connections occupies every available worker and denies service to legitimate clients. No authentication is required and the default configuration is affected. The chunk-size line must arrive in a write separate from the headers. When the body accompanies the headers, httpd_request_handler:handle_body/3 calls http_chunk:decode/3 inside a try ... catch throw:Error, so the {error, {chunk_size, _}} thrown by http_chunk:decode_size/4 is answered with 400 Bad Request. When the chunk size arrives later, the decoder is resumed through a bare catch in httpd_request_handler:handle_info/2, which converts the throw into a return value rather than raising it; the resulting error tuple is then treated as the next decoder continuation, the socket is re-armed, and the worker waits for data that never comes. The request timeout has already been cancelled at the point the headers were accepted, and the periodic byte-rate check is only armed when minimum_bytes_per_second is configured, which it is not by default. This issue affects OTP from OTP 18.1.4 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to inets from 6.0.3 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/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 · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 17:44 UTC
CWE
  • CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
References
Impacted products
Vendor Product Version CPE status
Erlang OTP Affected: 18.1.4 , < 27.3.4.17 (otp)
Affected: 28.0 , < 28.5.0.6 (otp)
Affected: 29.0 , < 29.0.6 (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: 6.0.3 , < 9.3.2.7 (otp)
Affected: 9.4 , < 9.6.2.3 (otp)
Affected: 9.7 , < 9.7.2 (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: 77acb473d8f056f6f534395f131c6e45693797f0 , < * (git)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Lukas Backström / Erlang Solutions Konrad Pietrzak / Ericsson Lukas Backström / Erlang Solutions
Show details on NVD website
To clipboard 

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    "vulnrichment": {
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When the chunk size arrives later, the decoder is resumed through a bare \u003ccode\u003ecatch\u003c/code\u003e in \u003ccode\u003ehttpd_request_handler:handle_info/2\u003c/code\u003e, which converts the throw into a return value rather than raising it; the resulting error tuple is then treated as the next decoder continuation, the socket is re-armed, and the worker waits for data that never comes. 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The worker serving the connection is never released and no timeout reclaims it, so repeating the request across connections occupies every available worker and denies service to legitimate clients. No authentication is required and the default configuration is affected.\\n\\nThe chunk-size line must arrive in a write separate from the headers. When the body accompanies the headers, `httpd_request_handler:handle_body/3` calls `http_chunk:decode/3` inside a `try ... catch throw:Error`, so the `{error, {chunk_size, _}}` thrown by `http_chunk:decode_size/4` is answered with `400 Bad Request`. When the chunk size arrives later, the decoder is resumed through a bare `catch` in `httpd_request_handler:handle_info/2`, which converts the throw into a return value rather than raising it; the resulting error tuple is then treated as the next decoder continuation, the socket is re-armed, and the worker waits for data that never comes. 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      "cveMetadata": "{\"cveId\": \"CVE-2026-69664\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"EEF\", \"dateReserved\": \"2026-08-17T10:45:02.808Z\", \"datePublished\": \"2026-09-01T14:59:03.512Z\", \"dateUpdated\": \"2026-09-01T17:45:20.907Z\"}",
      "dataType": "CVE_RECORD",
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  }
}



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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.