kisli VMime up to 0.9.2 Uuencoder uuEncoder::decode information disclosure

Summaryinfo

A vulnerability labeled as problematic has been found in kisli VMime up to 0.9.2. This affects the function uuEncoder::decode of the component Uuencoder. The manipulation results in information disclosure. This vulnerability is reported as CVE-2026-116739. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in kisli VMime up to 0.9.2. It has been classified as problematic. Affected is the function uuEncoder::decode of the component Uuencoder. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

VMime through 0.9.2 contains an information disclosure vulnerability in the uuEncoder::decode function that writes uninitialized stack memory into decoded output for over-long lines. Attackers can send a crafted uuencode or x-uuencode MIME part with a large line length byte to leak up to 15 bytes of stack contents per line in decoded attachments.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-116739 since 10/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

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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