CVE-2026-71380
Erlang inets httpd remote DoS via stalled large Content-Length requests.
Is CVE-2026-71380 being exploited?
Not confirmed. CVE-2026-71380 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2026-71380?
CVE-2026-71380 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-71380?
Yes. A fix has been recorded for CVE-2026-71380. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-71380 affect?
CVE-2026-71380 affects Erlang/OTP >=17.0 and <27.3.4.17, Erlang/OTP >=28.0 and <28.5.0.6, Erlang/OTP >=29.0 and <29.0.6, inets versions prior to 9.3.2.7, 9.6.2.3, 9.7.2.7 as mapped. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71380?
Upgrade OTP/inets to fixed versions; as interim enable min_bytes_per_second or apply connection rate limits.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can stall connections after headers, exhausting all httpd workers and causing denial of service with minimal bandwidth.
Immediate action required
- affected< 17.0
- affected>= 17.0 and < 27.3.4.17
- affected>= 28.0 and < 28.5.0.6
- affected>= 29.0 and < 29.0.6
- affected< 5.10
- affected>= 5.10 and < 9.3.2.7
- affected>= 9.4 and < 9.6.2.3
- affected>= 9.7 and < 9.7.2
- affected>= 84adefa331c4159d432d22840663c38f155cd4c1 and < 81b453aac5a006bb8d26405f2bc3cf24e9d7733c
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.