Kisli VMime up to 0.9.2 Uuencoder uuEncoder::decode integer underflow

Summaryinfo

A vulnerability categorized as critical has been discovered in Kisli VMime up to 0.9.2. Affected by this vulnerability is the function uuEncoder::decode of the component Uuencoder. Executing a manipulation can lead to integer underflow. This vulnerability is registered as CVE-2026-116738. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in Kisli VMime up to 0.9.2 and classified as critical. This vulnerability affects the function uuEncoder::decode of the component Uuencoder. The manipulation with an unknown input leads to a integer underflow vulnerability. The CWE definition for the vulnerability is CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

VMime through 0.9.2 contains an integer underflow in the uuEncoder::decode function that allows remote attackers to trigger a stack-based buffer overflow via crafted uuencoded MIME parts. Attackers can send an email with a uuencoded line whose length character is 'b' but is not a 'begin' line, corrupting stack memory to crash the application or potentially execute code.

The advisory is available at github.com. This vulnerability was named CVE-2026-116738 since 10/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/26/2026).

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

Vendor

• Kisli

Name

• VMime

Version

• 0.9.0
• 0.9.1
• 0.9.2

Website

• Product: https://github.com/kisli/vmime/

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