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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…

Description

When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data of unlimited size. 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-2026-101337 When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes 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
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