Skip to content
fr Sign in
8.2 High

CVE-2026-18664 When ranges are used for access control (i.e

Description

When ranges are used for access control (i.e. of the form 1.2.3.4-1.2.3.25), because NSD wrongly compares the IP address with the range on little endian systems, IPs that were meant to be allowed may be denied, and, IPs that were meant to be denied access could be allowed. An IPv4 address is compared with IPv4 ranges as unsigned 32 bit numbers directly with the endianness of the host, but the values to compare are in network byte order (big-endian). With IPv6 addresses the comparison is done in 4 times a unsigned 32 bit number comparison, again with the endianness of the host where all values are actually in network bye order.

Affected products and versions

Product Affected versions Fixed in
NSD 3.0 3.0.0 → < 4.15.1 4.15.1

References

Timeline

  1. Published
  2. Last modified

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-2026-101337 When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes 8.7 High
Track this CVE