SB2026092160 - Anolis OS update for libevent

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Main Vulnerability Database SB2026092160

SB2026092160 - Anolis OS update for libevent

Published: September 21, 2026

Security Bulletin ID SB2026092160
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Stack-based buffer overflow (CVE-ID: CVE-2026-63387)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service or corrupt adjacent stack state.

The vulnerability exists due to stack-based buffer overflow in dnsname_to_labels() in evdns.c when formatting DNS server responses containing name-bearing records. A remote attacker can send a specially crafted DNS query that causes the application to generate a crafted response to cause a denial of service or corrupt adjacent stack state.

The issue is triggered by an off-by-one condition when name encoding reaches the exact end of a 64 KB stack buffer before a terminating null byte is appended.


Remediation

Install update from vendor's website.

References