Out of bounds stack write with crafted APL RR
Summary
| CVE | CVE-2026-12246 |
|---|---|
| State | PUBLISHED |
| Assigner | NLnet Labs |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-25 07:16:45 UTC |
| Updated | 2026-06-26 02:07:47 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 7.2 HIGH from [email protected]
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.002650000 probability, percentile 0.177840000 (date 2026-06-29)
Problem Types: CWE-20 | CWE-120 | CWE-120 CWE-120: Buffer Copy without Checking Size of Input | CWE-20 CWE-20: Improper Input Validation
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 7.2 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 7.2 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Primary | 8.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | NLnet Labs | NSD | affected 4.14.0 4.14.3 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.nlnetlabs.nl/downloads/nsd/CVE-2026-12246.txt | [email protected] | www.nlnetlabs.nl | Patch, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Qifan Zhang from Palo Alto Networks (en)
CNA: Haruki Oyama from Waseda University (en)
CNA: zhangph (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-05-28T00:00:00.000Z | Issue reported by Qifan Zhang |
| CNA | 2026-05-28T00:00:00.000Z | Issue reported by Haruki Oyama |
| CNA | 2026-06-12T00:00:00.000Z | NLnet Labs shares patch with Qifan Zhang and Haruki Oyama |
| CNA | 2026-06-12T00:00:00.000Z | Haruki Oyama verifies patch |
| CNA | 2026-06-15T00:00:00.000Z | Qifan Zhang verifies patch |
| CNA | 2026-06-16T00:00:00.000Z | Issue reported by zhangph |
| CNA | 2026-06-12T00:00:00.000Z | NLnet Labs shares patch with zhangph |
| CNA | 2026-06-25T00:00:00.000Z | Fix released with version 4.14.3 |
Solutions
CNA: This issue is fixed starting with version 4.14.3.