What’s Vulnerable › Vulnerabilities

CVE-2026-116738: VMime through 0.9.2 Stack-Based Buffer Overflow via uuencode Decoder

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% 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-121

Description

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.

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#L185-L190
• 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-stack-based-buffer-overflow-via-uuencode-decoder

Get alerted when CVE-2026-116738 or the next vulnerability affects your stack