Bug 2526841 (CVE-2026-59696)

Summary: CVE-2026-59696 erlang-otp: Erlang/OTP stdlib: Denial of Service via malformed URI port
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: eglynn, jjoyce, jpretori, jschluet, lhh, mburns, mgarciac
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Erlang/OTP stdlib. A remote attacker can exploit an improper validation of specified quantity in input vulnerability by supplying a Uniform Resource Identifier (URI) with an excessively long port component. This can cause the `uri_string:get_port/1` function to pass a very long string of digits to `binary_to_integer/1` without proper length bounds. Consequently, the system performs hundreds of milliseconds of arbitrary-precision arithmetic, leading to a degradation of availability and a Denial of Service (DoS) for applications parsing attacker-supplied URIs.
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Bug Depends On: 2563283, 2563285    
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Description OSIDB Bzimport 2026-09-01 15:07:01 UTC 
Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP stdlib allows a remote attacker to degrade availability by supplying a URI whose port component is a very long run of digits.

uri_string:get_port/1 passes the port substring to binary_to_integer/1 with no length bound, catching only error:badarg, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the calling process hundreds of milliseconds of arbitrary-precision arithmetic. The conversion is reached from every authority-parsing path in uri_string:parse/1, including the host, registered-name, and IPv4 and IPv6 forms. parse/1 is the documented interface for parsing URIs, so any application that parses an attacker-supplied URI is exposed without further configuration. The conversion function is documented to accept integers of any size, so bounding the input is the caller's responsibility.

This issue affects OTP from OTP 21.0 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 stdlib from 3.5 before 6.2.2.5, from 7.0 before 7.3.0.2, and from 8.0 before 8.0.4.