CVE-2026-40954— Integer underflow in Secure Access clients prior to 14.55
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，该漏洞源于流量解析函数中的整数下溢，可能导致对隧道协议有深入了解和控制权的攻击者对其客户端造成非持久性拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Absolute Security | Secure Access | < 14.55 |
affected |
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I. Basic Information for CVE-2026-40954
Vulnerability Information
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Vulnerability Title
Integer underflow in Secure Access clients prior to 14.55
Source: CVE Program / CVE List V5
Vulnerability Description
CVE-2026-40954
is an integer underflow vulnerability in the traffic parsing function of Secure
Access clients prior to 14.55. Attackers with intimate knowledge of and total
control over the tunnel protocol can create a non-persistent DoS against their
client
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/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，该漏洞源于流量解析函数中的整数下溢，可能导致对隧道协议有深入了解和控制权的攻击者对其客户端造成非持久性拒绝服务。
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-2026-40954
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-40954 (1)
Same Patch Batch · Absolute Security · 2026-07-15 · 11 CVEs total
| CVE-2026-40952 | Privilge misconfiguration in Secure Access installers | |
| CVE-2026-40953 | Heap overflow in Secure Access clients | |
| 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-2026-40955 | 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-2026-40954
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