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CVE-2026-114426— Pre-authentication upload parsing permits resource exhaustion

Quick assessment

Affected
SEPPmail AG SEPPmail Secure Email Gateway (SEG)
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.

SEPPmail Secure Email Gateway 在 15.1.1 之前的版本中，会在对调用者进行身份验证之前，先处理并写入 v1 文件接口上传的数据，且未设置绝对请求大小限制。未经身份验证的远程攻击者可通过并发或慢速请求占用工作进程并消耗临时存储空间，从而导致服务不可用。

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-114426

Vulnerability Information
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Vulnerability Title
Pre-authentication upload parsing permits resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
SEPPmail Secure Email Gateway before 15.1.1 processes and writes v1 file-interface upload data before authenticating the caller and without an absolute request-size limit. An unauthenticated remote attacker can occupy workers and consume temporary storage with concurrent or slow requests, causing service unavailability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SEPPmail AG SEPPmail Secure Email Gateway (SEG) 0 ~ 15.1.1 -

II. Public POCs for CVE-2026-114426

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III. Intelligence Information for CVE-2026-114426

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Other References for CVE-2026-114426 (1)

Same Patch Batch · SEPPmail AG · 2026-11-04 · 5 CVEs total

CVE-2026-114424 9.2 CRITICAL Code execution through double evaluation in address replacement rules
CVE-2026-114425 9.2 CRITICAL Forged LFT metadata permits arbitrary file read and deletion
CVE-2026-114421 8.3 HIGH Empty initial password permits GINA account takeover
CVE-2026-114420 6.9 MEDIUM LDAP wildcard injection exposes GINA recipient accounts

IV. Related Vulnerabilities

Same product: SEPPmail Secure Email Gateway (SEG)
Same vendor: SEPPmail AG
Same weakness: CWE-400