libsolv solv File out-of-bounds write

Summaryinfo

A vulnerability was found in libsolv. It has been classified as critical. The impacted element is an unknown function of the component solv File Handler. This manipulation causes out-of-bounds write. This vulnerability appears as CVE-2026-48864. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in libsolv (unknown version). It has been declared as critical. Affected by this vulnerability is an unknown code block of the component solv File Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in libsolv. This heap buffer overflow occurs during the decompression of attacker-controlled compressed data within `.solv` files due to insufficient input validation. An attacker can provide a specially crafted `.solv` file, which, when processed by a vulnerable application, can lead to out-of-bounds memory access. This could result in information disclosure, alteration of program execution, or a denial of service.

The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2026-48864 since 05/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/24/2026).

The vulnerability scanner Nessus provides a plugin with the ID 322341 (RHEL 10 : libsolv (RHSA-2026:28236)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (322341) and EUVD (EUVD-2026-31859). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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• libsolv

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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