Service degradation via unbounded numeric header conversion
Published Sep 1, 2026 · Updated Sep 1, 2026
Denial of service in Erlang/OTP inets httpc allows remote attackers controlling an HTTP server to degrade client availability. httpc_handler and httpc_response convert unbounded Content-Length and Retry-After digit strings to arbitrary-precision integers before enforcing useful limits. The affected process must initiate an HTTP request to a malicious or compromised server; the demonstrated effect is hundreds of milliseconds of arithmetic per response.
Summary
What happened
Denial of service in Erlang/OTP inets httpc allows remote attackers controlling an HTTP server to degrade client availability. httpc_handler and httpc_response convert unbounded Content-Length and Retry-After digit strings to arbitrary-precision integers before enforcing useful limits. The affected process must initiate an HTTP request to a malicious or compromised server; the demonstrated effect is hundreds of milliseconds of arithmetic per response.
The record
- CVE
- CVE-2026-71562
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Vendor
- Erlang
- Product
- Erlang/OTP
- Classifications
- CWE-1284, CAPEC-231, T1499.004
- 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=84adefa331c4159d432d22840663c38f155cd4c1 <* changes=[{"at":"aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d","status":"unaffected"},{"at":"e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa","status":"unaffected"}]
- Affected versionversion=9.4 <9.6.2.3
- Affected versionversion=9.7 <9.7.2
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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