Red Hat Enterprise Linux up to 10 s_vlog out-of-bounds

Summaryinfo

A vulnerability, which was classified as very critical, was found in Red Hat Enterprise Linux 6/7/8/9/10. This vulnerability affects the function s_vlog. Executing a manipulation can lead to out-of-bounds. This vulnerability appears as CVE-2026-70368. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux 6/7/8/9/10. It has been declared as very critical. This vulnerability affects the function s_vlog. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A stack-based out-of-bounds read vulnerability exists in the "s_vlog" function of stunnel, when handling oversized log messages via "vsnprintf". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing "\n" characters with "\0".

The advisory is shared for download at access.redhat.com. This vulnerability was named CVE-2026-70368 since 08/04/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/04/2026).

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

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

Version

• 6
• 7
• 8
• 9
• 10

License

• commercial

Website

• Vendor: https://www.redhat.com/

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