Unauthenticated service denial via unenforced connection limit
Published Sep 1, 2026 · Updated Sep 1, 2026
Resource exhaustion in Erlang/OTP inets httpd allows remote attackers to interrupt service by holding open unlimited connections. httpd_manager:handle_new_connection/4 reads absent max_clients with httpd_util:lookup/2 as undefined, and Erlang term ordering lets every connection count pass the Count =< Max guard. No authentication or valid request is required, but only servers without an explicit max_clients setting are affected; accepted workers and sockets consume process, memory, and file-descriptor capacity.
Summary
What happened
Resource exhaustion in Erlang/OTP inets httpd allows remote attackers to interrupt service by holding open unlimited connections. httpd_manager:handle_new_connection/4 reads absent max_clients with httpd_util:lookup/2 as undefined, and Erlang term ordering lets every connection count pass the Count =< Max guard. No authentication or valid request is required, but only servers without an explicit max_clients setting are affected; accepted workers and sockets consume process, memory, and file-descriptor capacity.
The record
- CVE
- CVE-2026-70399
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Vendor
- Erlang
- Product
- Erlang/OTP
- Classifications
- CWE-770, CAPEC-469, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=17.0 <27.3.4.17
- Affected versionversion=28.0 <28.5.0.6
- Affected versionversion=29.0 <29.0.6
- Affected versionversion=5.10 <9.3.2.7
- Affected versionversion=9.4 <9.6.2.3
- Affected versionversion=9.7 <9.7.2
- Affected versionversion=d9674f32811cd5bb02b0d6656053b5ee226bc74c <* changes=[{"at":"d94a94c96eb4cccbd6f7d7da5975f0c035b69612","status":"unaffected"},{"at":"6746dc4e1df5257ad8ac91cbbd167cb8b0274ce7","status":"unaffected"},{"at":"e0050fc00c500a4fa9ba1f594603c787ff6d20b2","status":"unaffected"}]
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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