Red Hat Enterprise Linux libsoup heap-based overflow

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Red Hat Enterprise Linux. The affected element is an unknown function of the component libsoup. The manipulation leads to heap-based overflow. This vulnerability is documented as CVE-2026-102556. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux (affected version unknown). It has been rated as very critical. This issue affects an unknown functionality of the component libsoup. 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 confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.

The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2026-102556 since 09/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/29/2026).

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

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

Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

License

• commercial

Website

• Vendor: https://www.redhat.com/

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