Detections
Analytics
Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: libevent (UTSA-2026-106201)
high Nessus Plugin ID 342911
Synopsis
The Unity Linux host is missing one or more security updates.Description
The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-106201 advisory.Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an off-by-one stack buffer overflow in evdns.c when dnsname_to_labels formats a name-bearing DNS record at the end of the 64 KB stack buffer allocated by evdns_server_request_format_response. The final-label check permits j plus label_len plus one to equal buf_len, after which the terminating null byte is written to buf[buf_len]. A crafted DNS server response containing PTR, CNAME, MX, NS, or SOA data can trigger the one-byte out-of-bounds write and crash or corrupt the process. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Tenable has extracted the preceding description block directly from the Unity Linux security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected libevent package.See Also
https://atomgit.com/src-openeuler/libevent/issues/31
Plugin Details
Severity: High
ID: 342911
File Name: unity_linux_UTSA-2026-106201.nasl
Version: 1.1
Type: Local
Published: 9/4/2026
Updated: 9/4/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.9
Percentile: 52.49
CVSS v2
Risk Factor: Medium
Base Score: 6.6
Temporal Score: 4.9
Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:C
CVSS Score Source: CVE-2026-63387
CVSS v3
Risk Factor: High
Base Score: 7
Temporal Score: 6.1
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 9/4/2026
Vulnerability Publication Date: 8/20/2026
Reference Information
CVE: CVE-2026-63387