GStreamer librfb heap-based overflow

Summaryinfo

A vulnerability has been found in GStreamer and classified as critical. Affected is an unknown function of the component librfb. This manipulation causes heap-based overflow. This vulnerability is tracked as CVE-2026-52720. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in GStreamer (the affected version unknown) and classified as critical. Affected by this vulnerability is an unknown part of the component librfb. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is 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(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A heap buffer overflow vulnerability was found in GStreamer's librfb (RFB/VNC client). The rectangle bounds check incorrectly validates area rather than individual dimensions, allowing a malicious VNC server to send a rectangle that extends beyond the framebuffer. A remote attacker could set up a malicious VNC server and trick a user into connecting, resulting in an out-of-bounds heap write that could lead to code execution or a crash.

It is possible to read the advisory at access.redhat.com. This vulnerability is known as CVE-2026-52720 since 06/08/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/16/2026).

The vulnerability scanner Nessus provides a plugin with the ID 321144 (Linux Distros Unpatched Vulnerability : CVE-2026-52720), 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 vulnerability database at Tenable (321144). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Multimedia Processing Software

Name

• GStreamer

License

• open-source

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CPE 2.2info

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

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