Erlang OTP 27.3.4.16/28.4.x/29.0.5 stdlib uri_string.erl uri_string.get_port input validation

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Erlang OTP 27.3.4.16/28.4.x/29.0.5. This affects the function uri_string.get_port of the file uri_string.erl of the component stdlib. The manipulation of the argument port leads to input validation. This vulnerability is referenced as CVE-2026-59696. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Erlang OTP 27.3.4.16/28.4.x/29.0.5. This issue affects the function uri_string.get_port of the file uri_string.erl of the component stdlib. The manipulation of the argument port with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-59696 since 07/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 27.3.4.17, 28.5.0.6 or 29.0.6 eliminates this vulnerability.

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Productinfo

Vendor

• Erlang

Name

• OTP

Version

• 27.3.4.16
• 28.4.x
• 29.0.5

Website

• Product: https://github.com/erlang/otp/

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