CVE-2026-69664
published 2026-09-01CVE-2026-69664: Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of…
PriorityP357high8.7CVSS 4.0
AVNACLATNPRNUINVCNVINVAHSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.95%
60.8th percentile
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, OTP 28.5.0.6, and OTP 29.0.6, corresponding to inets from 6.0.3 before 9.3.2.7, 9.6.2.3, and 9.7.2.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | erlang | — | — |
| erlang | otp | >= 18.1.4 < * | * |
| erlang | otp | >= 6.0.3 < * | * |
| erlang | otp | >= 77acb473d8f056f6f534395f131c6e45693797f0 < * | * |
| ubuntu | erlang | — | — |
CVSS provenance
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat8.7HIGH
vendor_ubuntu7.5HIGH
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VulDB
Erlang OTP prior 27.3.4.17/28.5.0.6/29.0.6 httpd httpd_request_handler:handle_info denial of service (WID-SEC-2026-3146)
vuldb·2026-09-03·CVSS 8.7
CVE-2026-69664 [HIGH] Erlang OTP prior 27.3.4.17/28.5.0.6/29.0.6 httpd httpd_request_handler:handle_info denial of service (WID-SEC-2026-3146)
A vulnerability described as critical has been identified in Erlang OTP. Impacted is the function httpd_request_handler:handle_info of the component httpd. The manipulation results in denial of service.
This vulnerability is known as CVE-2026-69664. It is possible to launch the attack remotely. No exploit is available.
Upgrading the affected component is recommended.
Ubuntu
Erlang vulnerabilities
vendor_ubuntu·2026-09-28·CVSS 7.5
CVE-2026-23941 [HIGH] Erlang vulnerabilities
Title: Erlang vulnerabilities
Summary: Several security issues were fixed in Erlang.
It was discovered that the Erlang Port Mapper Daemon did not properly
handle slow connections. A remote attacker could possibly use this issue
to cause a denial of service. (CVE-2026-42792)
It was discovered that Erlang incorrectly handled certain external term
format data, leading to heap corruption. An attacker could possibly use
this issue to cause Erlang to crash, resulting in a denial of service.
This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.
(CVE-2026-55737)
It was discovered that Erlang incorrectly handled invalid external term
format data. An attacker could possibly use this issue to cause Erlang to
crash, resulting in a denial of service. This issue only affected Ubuntu
26.04
Red Hat
otp: inets: Erlang/OTP inets httpd: Denial of Service via malformed chunked HTTP request
vendor_redhat·2026-09-01·CVSS 8.7
CVE-2026-69664 [HIGH] CWE-772 otp: inets: Erlang/OTP inets httpd: Denial of Service via malformed chunked HTTP request
otp: inets: Erlang/OTP inets httpd: Denial of Service via malformed chunked HTTP request
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 .
No detection rules found.
No public exploits indexed.
https://cna.erlef.org/cves/CVE-2026-69664.htmlhttps://github.com/erlang/otp/commit/77acb473d8f056f6f534395f131c6e45693797f0https://github.com/erlang/otp/commit/a3adf63078438c86527d704e23282b7721d8ca12https://github.com/erlang/otp/commit/bd4e74348c6be8a49f060da6fd48d43f3a960292https://github.com/erlang/otp/commit/df1a9ca4666e2fdfc44886bfaae76de086d803f6https://github.com/erlang/otp/security/advisories/GHSA-mr35-8h7w-w3gqhttps://osv.dev/vulnerability/EEF-CVE-2026-69664https://www.erlang.org/doc/system/versions.html#order-of-versionshttps://github.com/erlang/otp/security/advisories/GHSA-mr35-8h7w-w3gq
2026-09-01
Published