SB2026052253 - Anolis OS update for dnsmasq
Published: May 22, 2026
Security Bulletin ID
SB2026052253
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2026-4890)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in NSEC bitmap parsing in dnssec.c when processing crafted DNSSEC NSEC or NSEC3 records. A remote attacker can send a specially crafted DNS response to cause a denial of service.
No valid DNSSEC signatures are needed because the issue is reachable before RRSIG validation.
Remediation
Install update from vendor's website.