Detections
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Echo: bind9: security update to 1:9.20.23-1~deb13u1

medium Tenable Cloud Security Plugin ID 464570

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND
 receives an incoming DNS message signed with SIG(0), it begins work to validate that signature. If, during
 that validation, the "recursive-clients" limit is reached (as would occur during a query flood), and that
 same DNS message is discarded per the limit, there is a brief window of time while the SIG(0) validation
 may attempt to read the now-discarded DNS message. This issue affects BIND 9 versions 9.20.0 through
 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.28 through 9.18.49
 and 9.18.28-S1 through 9.18.49-S1 are NOT affected. (CVE-2026-5947)

Solution

Update the bind9 library and its related packages to version 1:9.20.23-1~deb13u1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-5947

Plugin Details

Severity: Medium

ID: 464570

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.31

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-5947

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/21/2026

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-5947

IAVA: 2026-A-0498-S