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CVE-2026-40950· NVD / CVE Program· CNA Absolute

Buffer overflow in the Secure Access server prior to 14.50

CVE-2026-40950 is a buffer overflow vulnerability in the Secure Access server prior to 14.50. Attackers with control of a modified client can send a specially crafted message to the server and cause a denial of service

HighCVSS 7.1 · v4.0—No exploit No fix recorded
Published
Apr 30, 2026
Updated
Jun 17, 2026
EPSS
0.4% · 34th percentile
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Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Absolute
7.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
absolutesecure access

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • absolute secure accessbefore 14.50

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Absolute). Independent of NVD's CPE analysis and usually ahead of it.

  • Absolute Software Secure Access

    • before 14.50affected

Same product

absolute: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-55402CVE-2026-55402 is an out of bounds read vulnerability in Secure Access servers prior to version 14.57.
    34Monitor
  • CVE-2026-33445Memory management vulnerability in Secure Access servers
    34Monitor
  • CVE-2026-40952Privilge misconfiguration in Secure Access installers
    34Monitor
  • CVE-2026-33451Arbitrary read/write vulnerability in Windows clients prior to 14.50
    34Monitor
  • CVE-2025-49080Memory management vulnerability in Absolute Secure Access server versions 9.0 to 13.54
    34Monitor
  • CVE-2025-59595CVE-2025-59595 is an internally discovered denial of service vulnerability in versions of Secure Access prior to 14.12.
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-409490 days apartBuffer overflow in Windows clients prior to 14.50
    27Monitor
  • CVE-2026-334520 days apartBuffer overflow in Windows clients prior to 14.50
    23Monitor
  • CVE-2026-334470 days apartCVE-2026-33447 is a buffer overflow in a message parsing function of the Secure Access client prior to 14.50.
    9Monitor
  • CVE-2026-334490 days apartMessage handler buffer overflow in clients prior to 14.50
    9Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records