libcURL 8.8.0 API curl_url_get buffer over-read

Summaryinfo

A vulnerability, which was classified as critical, has been found in libcURL 8.8.0. This affects the function curl_url_get of the component API. The manipulation leads to buffer over-read. This vulnerability is uniquely identified as CVE-2024-6874. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in libcURL 8.8.0. It has been rated as critical. This issue affects the function curl_url_get of the component API. The manipulation with an unknown input leads to a buffer over-read vulnerability. Using CWE to declare the problem leads to CWE-126. The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

libcurl's URL API function [curl_url_get()](https://curl.se/libcurl/c/curl_url_get.html) offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the *macidn* IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string. This flaw can lead to stack contents accidently getting returned as part of the converted string.

The weakness was disclosed by Z2_. The advisory is shared at curl.se. The identification of this vulnerability is CVE-2024-6874 since 07/18/2024. 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.

The vulnerability scanner Nessus provides a plugin with the ID 234507 (Tenable Security Center Multiple Vulnerabilities (TNS-2025-04)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.9.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (234507). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Network Utility Software

Name

• libcURL

Version

• 8.8.0

License

• open-source

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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