8.7
High
CVE-2026-101337 When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes
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).
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| NSD 4.10 | 4.10.0 → < 4.15.3 | 4.15.3 |
Other CVEs of NSD
The 13 CVEs of NSD →
CVE-2026-101341
Tokens of text in RDATA (of for example TXT records) under 32 bytes are not checked to stay within the space reserved…
8.7
High
CVE-2026-101339
A HIP resource record that fills the RDATA near or at is limit, and has another dname RDATA field (a HIP Rendezvous…
8.7
High
CVE-2026-101338
When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the…
8.7
High
CVE-2026-19538
The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed…
8.2
High