When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes. This enables attackers to overwrite the stack with up to 64K of attacker controlled data. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).
History

Fri, 16 Oct 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Nlnetlabs
Nlnetlabs nsd
Vendors & Products Nlnetlabs
Nlnetlabs nsd

Wed, 14 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 14 Oct 2026 11:00:00 +0000

Type Values Removed Values Added
Description When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes. This enables attackers to overwrite the stack with up to 64K of attacker controlled data. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).
Title Stack overwrite from specially formatted base64 RDATA field
Weaknesses CWE-121
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: NLnet Labs

Published: 2026-10-14T10:56:15.073Z

Updated: 2026-10-14T14:09:58.370Z

Reserved: 2026-09-28T14:39:03.778Z

Link: CVE-2026-101337

cve-icon Vulnrichment

Updated: 2026-10-14T14:09:53.335Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T11:16:56.890

Modified: 2026-10-16T19:55:59.740

Link: CVE-2026-101337

cve-icon Redhat

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