CVE-2026-70399
Erlang inets HTTPd accepts unlimited connections allowing unauthenticated DoS.
Is CVE-2026-70399 being exploited?
Not confirmed. CVE-2026-70399 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 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-70399?
CVE-2026-70399 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-2026-70399?
Yes. A fix has been recorded for CVE-2026-70399. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-70399 affect?
CVE-2026-70399 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 5.10 - <9.3.2.7, 9.4 - <9.6.2.3, 9.7 - <9.7.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70399?
Upgrade to fixed OTP/inets versions or set max_clients explicitly; restart services.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can open/hold unlimited connections to exhaust processes, memory and file descriptors, causing service DoS.
Immediate action required
- 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 and < 9.3.2.7
- affected>= 9.4 and < 9.6.2.3
- affected>= 9.7 and < 9.7.2
- affected>= d9674f32811cd5bb02b0d6656053b5ee226bc74c and < *
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.