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CVE-2026-55400

Quick assessment

Affected
Absolute Security Secure Access
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.

CVE-2026-55400 是 Secure Access 服务器在 14.57 版本之前存在的一个整数下溢漏洞。拥有认证会话的攻击者可以向采用非默认配置的服务器发送特制的流量，从而导致持久的拒绝服务（DoS）攻击。

CVSS 6.0 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Absolute Security Secure Access < 14.57 affected
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I. Basic Information for CVE-2026-55400

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
CVE-2026-55400 is an integer underflow in Secure Access servers prior to version 14.57. Attackers with an authenticated session can send specially crafted traffic to a server in a non-default configuration and cause a persistent denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Absolute Security Secure Access 0 ~ 14.57 -

II. Public POCs for CVE-2026-55400

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III. Intelligence Information for CVE-2026-55400

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Vendor Advisories for CVE-2026-55400 (1)

Same Patch Batch · Absolute Security · 2026-08-13 · 3 CVEs total

CVE-2026-55402 8.7 HIGH Secure Access servers <14.57越界读取导致DoS
CVE-2026-55401 6.9 MEDIUM Secure Access<14.57空指针引用致负载子系统崩溃

IV. Related Vulnerabilities

Same product: Secure Access
Same vendor: Absolute Security

V. Comments for CVE-2026-55400

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