Detections
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Echo: krb5: security update to 1.21.3-5+e4

high Tenable Cloud Security Plugin ID 458796

Description

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

 - In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read
 if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in
 /etc/gss/mech. An unauthenticated remote attacker can trigger this, possibly causing the process to
 terminate in parse_message. (CVE-2026-40356)

Solution

Update the krb5 library and its related packages to version 1.21.3-5+e4 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-40356

Plugin Details

Severity: High

ID: 458796

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.75

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-40356

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/30/2026

Vulnerability Publication Date: 4/28/2026

Reference Information

CVE: CVE-2026-40356