CVE-2026-42959
NLnet Labs Unbound, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 취약점
NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate pro...
- 대응 우선순위
- 점검
- CVSS
- 8.7
- EPSS
- 0.78% 백분위 52.3% · 2026.08.04 기준
- CISA KEV
- 미등록
- 조치 기한
- -
- 공개일
- 2026.05.20