VMime through 0.9.2 contains an information disclosure vulnerability in the uuEncoder::decode function that writes
Source GCVE Database
Not known to be exploited · CVSS 5.3 Medium.
Data as of 27 Oct 2026, 02:27 UTC
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| kislivmime | Affected
| Fixed in– |
GitHubvmimepkg:github/vmimeOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Users should monitor vendor advisories for updates. In the meantime, cautious handling or filtering of uuencode or x-uuencode MIME parts with unusually large line lengths may reduce exposure.
Description
VMime versions through 0.9.2 have an information disclosure vulnerability in the uuEncoder::decode function. This flaw causes uninitialized stack memory to be written into decoded output when processing over-long lines in uuencode or x-uuencode MIME parts. An attacker can exploit this by sending crafted MIME parts with large line length bytes, potentially leaking up to 15 bytes of stack memory per line in decoded attachments.
References
- nvd.nist.gov/vuln/detail/CVE-2026-116739 (opens in a new tab)
- github.com/kisli/vmime/pull/363 (opens in a new tab)
- github.com/kisli/vmime/commit/e85925eddc638939f0eeb7ee55ec047d04a760d8 (opens in a new tab)
- github.com/kisli/vmime (opens in a new tab)
- github.com/kisli/vmime/blob/v0.9.2/src/vmime/utility/encoder/uuEncoder.cpp (opens in a new tab)
- hackmd.io/@haindpwn/vmime-uuencode-decoder-oob-write (opens in a new tab)
- vulncheck.com/advisories/vmime-through-0.9.2-uninitialized-stack-memory-disclosure-via-uuencode-decoder (opens in a new tab)