# CVE-2026-55401: Null dereference in Secure Access

> Unauthenticated attackers can crash the internal load balancer of Secure Access servers by sending a crafted packet, causing a denial of service.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Aug 2026
- **Updated:** 13 Aug 2026
- **Also known as:** GHSA-8pcf-2r89-jjr2

## What is CVE-2026-55401?

CVE-2026-55401 is a medium-severity vulnerability in Absolute Secure Access, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CVE-2026-55401 is a null dereference vulnerability on the load-balancing
 sub-system of Secure Access servers prior to 14.57. Attackers can send 
an unauthenticated packet to a Secure Access server with load balancing 
enabled, which results in the internal load balancer crashing. After a 
successful attack, the Secure Access server is still able to accept 
connections and is still able to issue a failover to connected clients. ‍ https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-55401?

It affects 1 product.


Products: Absolute Secure Access.

## How do I fix CVE-2026-55401?

No fix has been published for CVE-2026-55401 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-55401 being exploited?

There is no known exploitation of CVE-2026-55401 in the wild and no public exploit code.

## Other vulnerabilities in Absolute Secure Access

- [CVE-2026-55402](https://insights.sbomify.com/CVE-2026-55402/): Denial of service in Secure Access (high 8.7)
- [CVE-2026-33445](https://insights.sbomify.com/CVE-2026-33445/): Memory management vulnerability in Secure Access servers (high 8.7)
- [CVE-2025-49080](https://insights.sbomify.com/CVE-2025-49080/): Memory management vulnerability in Absolute Secure Access server versions 9.0 to 13.54 (high 8.7)
- [CVE-2026-40952](https://insights.sbomify.com/CVE-2026-40952/): Privilge misconfiguration in Secure Access installers (high 8.5)
- [CVE-2026-33451](https://insights.sbomify.com/CVE-2026-33451/): Arbitrary read/write vulnerability in Windows clients prior to 14.50 (high 8.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55401 and fix it if it is affected.

What it is: CVE-2026-55401 is a medium-severity vulnerability in Absolute Secure Access, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-55401 in the wild and no public exploit code.

Affected product: Absolute Secure Access. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-55401/ (Markdown: https://insights.sbomify.com/CVE-2026-55401/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55401
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55401
- OSV: https://osv.dev/vulnerability/CVE-2026-55401

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55401/
Summaries are generated and may contain mistakes; the official description above is the record.