CVE-2026-12246

Description

NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.

CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.18%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-20 Improper Input Validation

CWE-120 CWE-120

Affected Products

Vendor	Product	Versions
nlnetlabs	nsd	4.14.0 — 4.14.3

References

Advisories & Patches

https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12246.txt

Frequently Asked Questions

What is CVE-2026-12246? +

NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-12246? +

CVE-2026-12246 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-12246? +

CVE-2026-12246 affects products from nlnetlabs, specifically: nsd. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-12246? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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