CVE-2026-19538
HIGHCVSS 7.5/10EPSS 0.35%
Last modified
CVE-2026-19538 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.. EPSS estimates a 0.35% chance of exploitation in the next 30 days.
Description
The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nlnetlabs | Nsd | >= 4.8.0, < 4.15.1 |
References
- https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txtVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-19538?
The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.
How severe is CVE-2026-19538?
CVE-2026-19538 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.
How do I fix CVE-2026-19538?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
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Are you affected by CVE-2026-19538?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST