CVE-2026-71380
Vulnérabilité élevée dans OTP (Erlang)
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.
Gravité et risque d'exploitation
CVE-2026-71380 obtient un score CVSS de 8.7/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.67 %, ce qui la place devant 51.2 % des CVE référencées.
Que faire ?
- Vérifiez si OTP (versions <9.7.2, 5.10, 9.4, <9.6.2.3, 17.0, <27.3.4.17, <5.10, <28.5.0.6, 9.7, <81b453aac5a006bb8d26405f2bc3cf24e9d7733c, 28.0, 29.0, <9.3.2.7, <17.0, 0, 84adefa331c4159d432d22840663c38f155cd4c1, <29.0.6) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- 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
