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PatchSiren cyber security CVE debrief

CVE-2026-40955 Absolute Security CVE debrief

CVE-2026-40955 is an integer underflow vulnerability in the traffic parsing function of Secure Access clients prior to 14.55. This vulnerability allows attackers with intimate knowledge of and total control over the tunnel protocol to create a non-persistent Denial of Service (DoS) against their client. The vulnerability has a CVSS score of 2.1, indicating a low severity. Users of Secure Access clients prior to version 14.55 should be aware of this vulnerability and take steps to mitigate it. The vulnerability exists due to improper handling of traffic parsing, which can lead to a DoS condition.

Vendor
Absolute Security
Product
Secure Access
CVSS
LOW 2.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-15
Original CVE updated
2026-07-16
Advisory published
2026-07-15
Advisory updated
2026-07-16

Who should care

Users of Secure Access clients prior to version 14.55 should be aware of this vulnerability and take steps to mitigate it. This includes administrators and security teams responsible for the Secure Access client deployments. They should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. Additionally, they should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Technical summary

The vulnerability exists in the traffic parsing function of Secure Access clients prior to 14.55. An attacker with intimate knowledge of and total control over the tunnel protocol can exploit this vulnerability to create a non-persistent Denial of Service (DoS) against their client. The CVSS score for this vulnerability is 2.1, indicating a low severity. The vulnerability is caused by an integer underflow in the traffic parsing function, which can be exploited by an attacker to cause a DoS condition. The affected product is Secure Access clients prior to version 14.55.

Defensive priority

This vulnerability has a low CVSS score of 2.1, indicating a relatively low priority for defense. However, users of Secure Access clients prior to version 14.55 should still take steps to mitigate the vulnerability.

Recommended defensive actions

  • Inventory and verify Secure Access client versions
  • Upgrade to version 14.55 or later
  • Monitor for suspicious tunnel protocol activity
  • Implement compensating controls for DoS attacks
  • Review and verify affected system scope with vendor guidance
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record was published on 2026-07-15T20:16:59.893Z and last modified on 2026-07-16T02:56:06.420Z. The NVD entry is currently Analyzed. The vulnerability details are based on the information available from the CVE and NVD sources. However, the impact and scope might be wider, and defenders should verify the affected systems and exposure with the provided references.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40955 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40955

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-40955 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40955

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.