---
id: CVE-2026-116739
title: VMime through 0.9.2 Uninitialized Stack Memory Disclosure via uuencode Decoder
summary: >-
  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 MI…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-908
vendor: kisli
product: vmime
affected:
  - vmime <= 0.9.2
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T21:52:38.496Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116739'
references:
  - url: 'https://github.com/kisli/vmime/pull/363'
    label: 'Pull Request #363'
  - url: >-
      https://github.com/kisli/vmime/commit/e85925eddc638939f0eeb7ee55ec047d04a760d8
    label: Patch Commit
  - url: 'https://github.com/kisli/vmime'
  - url: >-
      https://github.com/kisli/vmime/blob/v0.9.2/src/vmime/utility/encoder/uuEncoder.cpp#L311
  - url: 'https://hackmd.io/@haindpwn/vmime-uuencode-decoder-oob-write'
  - url: >-
      https://www.vulncheck.com/advisories/vmime-through-0.9.2-uninitialized-stack-memory-disclosure-via-uuencode-decoder
    label: >-
      VulnCheck Advisory: VMime through 0.9.2 Uninitialized Stack Memory
      Disclosure via uuencode Decoder
tags:
  - cve.org
epss: 0.00252
epssPercentile: 0.16567
ingestedAt: '2026-10-27T16:11:59.120Z'
---

## Overview

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

- `vmime <= 0.9.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.