---
id: CVE-2026-116738
title: VMime through 0.9.2 Stack-Based Buffer Overflow via uuencode Decoder
summary: >-
  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…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-121
vendor: kisli
product: vmime
affected:
  - vmime <= 0.9.2
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-27T13:52:10.451418Z'
published: '2026-10-26'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T14:16:56.633Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116738'
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#L185-L190
  - url: 'https://hackmd.io/@haindpwn/vmime-uuencode-decoder-oob-write'
  - url: >-
      https://www.vulncheck.com/advisories/vmime-through-0.9.2-stack-based-buffer-overflow-via-uuencode-decoder
    label: >-
      VulnCheck Advisory: VMime through 0.9.2 Stack-Based Buffer Overflow via
      uuencode Decoder
tags:
  - cve.org
epss: 0.00725
epssPercentile: 0.5386
ingestedAt: '2026-10-27T16:11:59.452Z'
---

## Overview

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

- `vmime <= 0.9.2`

## Remediation

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