CVE-2026-74835: inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body Reception
The inets application HTTP server httpd fails to enforce a configured body-size limit on chunked request.
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
inets/httpdto a version that resolves this vulnerability.Fixed in 9.3.2.7 - Upgrade
Upgrade
inets/httpdto a version that resolves this vulnerability.Fixed in 9.6.2.3 - Upgrade
Upgrade
inets/httpdto a version that resolves this vulnerability.Fixed in 9.7.2
Event History
Frequently Asked Questions
Which deployments are exposed to this issue?
Deployments using the inets application HTTP server (httpd) in the affected OTP or inets version ranges are exposed. The issue applies when a body-size limit is configured, because chunked request bodies do not have that limit enforced.
What does an attacker need to do to trigger the problem?
An attacker needs to send an HTTP request using a chunked body to the affected httpd server. The server can continue receiving the body without enforcing the configured maximum body size, leading to memory exhaustion.
Are older releases known to be affected?
OTP releases before 17.0, corresponding to inets releases before 5.10, have an unknown affected status. They should not be assumed safe based on the available information.
Which releases contain the fix?
The fixed releases are OTP 27.3.4.17, OTP 28.5.0.6, and OTP 29.0.6, corresponding to inets 9.3.2.7, 9.6.2.3, and 9.7.2.