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CVE-2026-101338 is a stack-based buffer overflow in the NLnet Labs NSD authoritative DNS server's zone-file parser. A specially formatted SVCB or HTTPS resource record can fill the wire-format RDATA buffer to its limit, after which an additional ECH parameter can overwrite the stack. Once the limit is exceeded, the base64 decoder can write attacker-controlled data of unbounded size beyond the buffer. Triggering the vulnerability requires a crafted zone file supplied directly to NSD. Zone files written by NSD itself, including those for secondary zones, do not have the triggering format. The vulnerability is classified as a high-severity, remote-code-execution-class stack overwrite.
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An RDATA boundary-handling flaw in simdzone's parsing of SVCB and HTTPS parameters. The fix prevents parsing additional parameters when RDATA is already full. The update to simdzone 0.2.7 includes the fix; the content does not specify the resulting security impact or affected version ranges.
A flaw in simdzone's parsing of SVCB and HTTPS parameters when RDATA is already full. Fixed in simdzone 0.2.7 by preventing further parameter parsing in that condition.
An RDATA boundary-handling flaw in simdzone involving parsing SVCB or HTTPS parameters when RDATA is already full. Fixed in simdzone 0.2.7 by preventing further parameter parsing in that condition.
An RDATA bounds-handling flaw in simdzone when parsing SVCB or HTTPS parameters. The fix prevents further parameter parsing when RDATA is already full. Fixed in simdzone 0.2.7; the content does not specify the ultimate security impact.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
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