CVE-2026-33259 — Use-After-Free
CVE-2026-33259 — Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.
What This Means For You
- If your environment is affected by this vulnerability type, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-33259 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Possible Use-After-Free via Excessive Concurrent RPZ Transfers - CVE-2026-33259
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-33259 | vulnerability | CVE-2026-33259 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 22, 2026 at 13:16 UTC |
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