CVE-2026-69664
Received
Received - Intake
Denial of Service in Erlang/OTP inets httpd
Vulnerability report for CVE-2026-69664, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-01
Last updated on: 2026-09-01
Assigner: EEF
Description
Description
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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| erlang | otp | From 18.1.4 (inc) to 27.3.4.17 (exc) |
| erlang | otp | From 28.0 (inc) to 28.5.0.6 (inc) |
| erlang | otp | From 29.0 (inc) to 29.0.6 (exc) |
| erlang | inets | From 6.0.3 (inc) to 9.3.2.7 (exc) |
| erlang | inets | From 9.4 (inc) to 9.6.2.3 (inc) |
| erlang | inets | From 9.7 (inc) to 9.7.2 (exc) |
| erlang | otp | to 27.3.4.17 (exc) |
| erlang | otp | to 28.5.0.6 (exc) |
| erlang | otp | to 29.0.6 (exc) |
| erlang | inets | to 9.3.2.7 (exc) |
| erlang | inets | to 9.6.2.3 (exc) |
| erlang | inets | to 9.7.2 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-772 | The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. |
