Red Hat Enterprise Linux libstdc++ buffer overflow

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux, Hardened Images and OpenShift Container Platform. It has been declared as problematic. This affects an unknown function of the component libstdc++. Such manipulation leads to buffer overflow. This vulnerability is listed as CVE-2026-125709. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux, Hardened Images and OpenShift Container Platform (version now known). It has been rated as problematic. Affected by this issue is some unknown processing of the component libstdc++. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. Impacted is integrity, and availability. CVE summarizes:

A flaw was found in libstdc++. When a byte-by-byte write operation fails during file stream processing, the library may still append data into the internal memory buffer. An attacker capable of inducing repeated write failures in an affected service can trigger a buffer overflow, potentially resulting in a Denial of Service (DoS) or memory corruption.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-125709 since 11/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 11/10/2026).

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
• Hardened Images
• OpenShift Container Platform

License

• commercial

Website

• Vendor: https://www.redhat.com/

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