libsolv solv File repo_add_solv heap-based overflow

Summaryinfo

A vulnerability classified as critical has been found in libsolv. Affected is the function repo_add_solv of the component solv File Handler. The manipulation leads to heap-based overflow. This vulnerability is traded as CVE-2026-9149. It is possible to initiate the attack remotely. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as critical, has been found in libsolv (version now known). This issue affects the function repo_add_solv of the component solv File Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is availability. The summary by CVE is:

A flaw was found in libsolv. This heap buffer overflow vulnerability occurs when a victim processes a specially crafted `.solv` file containing negative size values in the `repo_add_solv` function. This leads to an undersized memory allocation and a subsequent out-of-bounds write. An attacker could exploit this to cause a denial of service (DoS).

It is possible to read the advisory at access.redhat.com. The identification of this vulnerability is CVE-2026-9149 since 05/21/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 316421 (Linux Distros Unpatched Vulnerability : CVE-2026-9149), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202605-4475), Tenable (316421) and EUVD (EUVD-2026-31201). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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• libsolv

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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