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CVE-2026-40953— Heap overflow in Secure Access clients

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.

Absolute secure access是Absolute公司的一套企业访问控制解决方案。 Absolute Secure Access 14.55之前版本存在安全漏洞，该漏洞源于证书解析函数存在堆缓冲区溢出，可能导致具有本地访问和管理员权限的攻击者对客户端发起拒绝服务攻击。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Absolute Security Secure Access < 14.55 affected
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I. Basic Information for CVE-2026-40953

Vulnerability Information
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Vulnerability Title
Heap overflow in Secure Access clients
Source: CVE Program / CVE List V5
Vulnerability Description
CVE-2026-40953 is a heap overflow in the certificate parsing function of Secure Access clients prior to 14.55. Attackers with local access and administrator permissions can create a denial of service attack against the client over which they have control.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/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
Vulnerability Title
Absolute Secure Access 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Absolute secure access是Absolute公司的一套企业访问控制解决方案。 Absolute Secure Access 14.55之前版本存在安全漏洞，该漏洞源于证书解析函数存在堆缓冲区溢出，可能导致具有本地访问和管理员权限的攻击者对客户端发起拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Absolute Security Secure Access 0 ~ 14.55 -

II. Public POCs for CVE-2026-40953

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III. Intelligence Information for CVE-2026-40953

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Vendor Advisories for CVE-2026-40953 (1)

Same Patch Batch · Absolute Security · 2026-07-15 · 11 CVEs total

CVE-2026-40952 Privilge misconfiguration in Secure Access installers
CVE-2026-40958 Input validation error in Secure Access clients prior to 14.55
CVE-2026-40957 Frameable content vulnerability in the Secure Access server login page
CVE-2026-40956 Memory disclosure in Secure Access Clients
CVE-2026-40954 Integer underflow in Secure Access clients prior to 14.55
CVE-2026-40955 Integer underflow vulnerability in Secure Access clients
CVE-2026-33443 Memory management error in Secure Access servers prior to 14.55
CVE-2026-55399 Resource exhaustion vulnerability in the Secure Access publisher
CVE-2026-55398 Memory management vulnerability in Secure Access clients
CVE-2026-33445 Memory management vulnerability in Secure Access servers

IV. Related Vulnerabilities

Same product: Secure Access
Same vendor: Absolute Security

V. Comments for CVE-2026-40953

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