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unbound

NLnet Labs Unbound up to and including version 1.25.1 contains a heap buffer overflow vulnerability in the DNSSEC validator when processing certain RRSIG-covered PX, RP, MINFO, or SOA resource records. The issue arises because the validator does not verify the presence of a second embedded domain name before passing its address to a function that converts domain names to lowercase, potentially causing out-of-bounds memory reads and heap corruption. This vulnerability has a medium severity rating and a CVSS score of 4.8.

In NLnet Labs Unbound versions up to and including 1.25.1, the DNSSEC validator improperly handles multi-domain name resource records (PX, RP, MINFO, SOA) by computing the address of a second embedded domain name without verifying its presence. The wire-format parser accepts records where the RDATA ends after the first domain name, leading to a scenario where the function 'query_dname_tolower()' reads beyond the allocated heap buffer if the second domain name is absent. This results in a heap buffer overflow, with the impact depending on the contents of adjacent heap memory and the configured message buffer size.

NLnet Labs Unbound up to and including version 1.25.1 contains a heap buffer overflow vulnerability in the DNSSEC validator when processing certain RRSIG-covered PX, RP, MINFO, or SOA resource records. The issue arises because the validator does not verify the presence of a second embedded domain na

In NLnet Labs Unbound up to and including version 1.25.1, when the validator builds the canonical RDATA form for an RRSIG-covered PX/RP/MINFO/SOA… (CVE-2026-56416)

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