CVE-2026-116739
CVE-2026-116739
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.
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- github.com/kisli/vmime/pull/363 (issue-tracking, patch)
- github.com/kisli/vmime/commit/e85925eddc638939f0eeb7ee55ec047d04a760d8 (patch)
- github.com/kisli/vmime (product)
- github.com/kisli/vmime/blob/v0.9.2/src/vmime/utility/encoder/uuEncoder.cpp (technical-description)
- hackmd.io/@haindpwn/vmime-uuencode-decoder-oob-write (third-party-advisory)
- www.vulncheck.com/advisories/vmime-through-0.9.2-uninitialized-stack-memory-dis… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116739?
- CVE-2026-116739 is a medium-severity vulnerability, classified under Use of Uninitialized Resource. CVSS score: 4.3/10. Published 2026-10-26.
- How severe is CVE-2026-116739?
- Medium severity. CVSS v3 base score is 4.3 out of 10.