CVE-2026-48131 VPND IKE Fragment Reassembly - Heap Out-of-Bounds Write via Sequence Number Zero
A heap out-of-bounds write in the VPN service allows remote attackers to cause a denial of service by sending malformed IKE fragments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48131?
CVE-2026-48131 is a high-severity memory corruption vulnerability in checkpoint Quantum Security Gateway, published on 26 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The VPN service may mishandle an unexpected IKE fragment value received on the IKE port 500/UDP during the early stage of a connection attempt. This can cause the service to terminate unexpectedly, resulting in denial of service (temporary disruption of VPN-related functionality).
Weakness: CWE-122
Which versions are affected by CVE-2026-48131?
How do I fix CVE-2026-48131?
No fix has been published for CVE-2026-48131 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-48131 being exploited?
There is no known exploitation of CVE-2026-48131 in the wild and no public exploit code.
Sources
Also known as GHSA-4qg4-f998-wjmm.