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Echo: krb5: security update to 1.21.3-5+e6

medium Tenable Cloud Security Plugin ID 460086

Description

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

 - An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in
 plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2)
 without a prior bounds check. When bv_len is 0 or 1, the subtraction wraps to a large value which is then
 truncated to uint16_t, yielding 0xFFFE (65534) or 0xFFFF (65535). The subsequent malloc succeeds and
 memcpy reads up to 65534 bytes from a 0-1 byte buffer, resulting in a heap out-of-bounds read. The attack
 vector involves a malicious or compromised LDAP KDB backend returning a krbExtraData attribute with bv_len
 < 2, triggering the underflow when the KDC or kadmind reads principal data. (CVE-2026-11850)

Solution

Update the krb5 library and its related packages to version 1.21.3-5+e6 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-11850

Plugin Details

Severity: Medium

ID: 460086

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.47

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2026-11850

CVSS v3

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.4

Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:L/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: 6/12/2026

Vulnerability Publication Date: 6/11/2026

Reference Information

CVE: CVE-2026-11850