What’s Vulnerable › Vulnerabilities

CVE-2026-116739: VMime through 0.9.2 Uninitialized Stack Memory Disclosure via uuencode Decoder

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-27
• Weakness: CWE-908

Description

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.

Affected products

• kisli vmime: through 0.9.2

References

• https://github.com/kisli/vmime
• https://github.com/kisli/vmime/blob/v0.9.2/src/vmime/utility/encoder/uuEncoder.cpp#L311
• https://github.com/kisli/vmime/commit/e85925eddc638939f0eeb7ee55ec047d04a760d8
• https://github.com/kisli/vmime/pull/363
• https://hackmd.io/@haindpwn/vmime-uuencode-decoder-oob-write
• https://www.vulncheck.com/advisories/vmime-through-0.9.2-uninitialized-stack-memory-disclosure-via-uuencode-decoder

Get alerted when CVE-2026-116739 or the next vulnerability affects your stack