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CVE-2026-116739— VMime through 0.9.2 Uninitialized Stack Memory Disclosure via uuencode Decoder

Quick assessment

Affected
kisli vmime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

VMime 0.9.2 及更早版本中的 函数存在信息泄露漏洞。当处理过长的行时，该函数会将未初始化的栈内存写入解码后的输出。攻击者可构造包含超长行长度字节的 uuencode 或 x-uuencode MIME 部分，从而在解码的附件中逐行泄露最多 15 字节的栈内存内容。

CVSS 4.3 · Medium EPSS 0.25% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
kisli vmime ≤ 0.9.2 affected
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I. Basic Information for CVE-2026-116739

Vulnerability Information
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Vulnerability Title
VMime through 0.9.2 Uninitialized Stack Memory Disclosure via uuencode Decoder
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kisli vmime 0 ~ 0.9.2 -

II. Public POCs for CVE-2026-116739

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116739

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Patches & Fixes for CVE-2026-116739 (2)

Vendor Advisories for CVE-2026-116739 (1)

Security Blog Posts for CVE-2026-116739 (1)

Vendor Pages for CVE-2026-116739 (1)

IV. Related Vulnerabilities

Same product: vmime
Same vendor: kisli
Same weakness: CWE-908