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CVE-2026-71380— httpd applies no timeout while receiving a request body, parking a worker on a stalled client

Quick assessment

Affected
Erlang OTP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是对该漏洞描述信息的中文翻译： Erlang/OTP inets 模块中的 httpd 存在“资源在有效生命周期结束后未释放”的漏洞。未认证的远程攻击者可以通过发送带有大 字段的合法请求头，随后在请求体传输完成前停滞（stalling），从而造成服务拒绝（DoS）。 技术细节： 在解析步骤（包括请求头）成功时立即取消了请求超时定时器；而处理“解码器请求更多数据”的子句会将 socket 重新设置为 ，但未设置任何后续定时器。当接收到的字节数少于声明的 时， 会返回一个等待更多数据的 continuation。因

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-71380

Vulnerability Information
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Vulnerability Title
httpd applies no timeout while receiving a request body, parking a worker on a stalled client
Source: CVE Program / CVE List V5
Vulnerability 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 valid request headers with a large Content-Length and then stalling before the body is complete. httpd_request_handler:handle_info/2 cancels the request timeout as soon as a parse step succeeds, which includes the headers, and the clause that handles a decoder asking for more data re-arms the socket with {active, once} without setting any further timer. httpd_request:whole_body/2 returns such a continuation whenever the bytes received are fewer than the announced Content-Length, so a well-formed request that stops mid-body leaves the worker waiting indefinitely. The periodic byte-rate check that would reclaim it is armed only when minimum_bytes_per_second is configured, which it is not by default. Repeating this across connections occupies every worker permitted by max_clients and denies service to legitimate clients at negligible bandwidth cost. This issue affects OTP from OTP 17.0 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 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Erlang OTP 17.0 ~ 27.3.4.17 cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 5.10 ~ 9.3.2.7 cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 84adefa331c4159d432d22840663c38f155cd4c1 ~ 81b453aac5a006bb8d26405f2bc3cf24e9d7733c cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-71380

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III. Intelligence Information for CVE-2026-71380

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Other References for CVE-2026-71380 (4)

Same Patch Batch · Erlang · 2026-09-01 · 8 CVEs total

CVE-2026-70399 8.7 HIGH httpd does not enforce the documented default max_clients connection limit
CVE-2026-66357 8.3 HIGH inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation
CVE-2026-73812 8.3 HIGH inets, httpd: HTTP Request Smuggling via Transfer-Encoding and Content-Length
CVE-2026-73276 8.3 HIGH inets, httpd: HTTP Request Smuggling via Whitespace-Before-Colon Header Dropping i
CVE-2026-55951 8.2 HIGH httpc memory exhaustion via unbounded response header accumulation
CVE-2026-59696 6.9 MEDIUM uri_string does not bound the port component of a URI before integer conversion
CVE-2026-71562 6.3 MEDIUM httpc does not bound server-supplied numeric header values before integer conversion

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-772

V. Comments for CVE-2026-71380

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