Red Hat Enterprise Linux 9 rfbsrc plugin heap-based overflow

Summaryinfo

A vulnerability has been found in Red Hat Enterprise Linux 10, Enterprise Linux 6, Enterprise Linux 7, Enterprise Linux 8 and Enterprise Linux 9 and classified as problematic. Affected by this issue is some unknown functionality of the component rfbsrc plugin. This manipulation causes heap-based overflow. This vulnerability is handled as CVE-2026-59691. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Red Hat Enterprise Linux 10, Enterprise Linux 6, Enterprise Linux 7, Enterprise Linux 8 and Enterprise Linux 9. Affected by this vulnerability is an unknown part of the component rfbsrc plugin. 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 integrity, and availability. The summary by CVE is:

A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential memory corruption.

It is possible to read the advisory at access.redhat.com. This vulnerability is known as CVE-2026-59691 since 07/06/2026. 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. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/09/2026).

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

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Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux 6
• Enterprise Linux 7
• Enterprise Linux 8
• Enterprise Linux 9
• Enterprise Linux 10

License

• open-source

Website

• Vendor: https://www.redhat.com/

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