Alpine: krb5: security update to 1.22.3-r0

high Tenable Cloud Security Plugin ID 478901

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

- 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)

- MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's
get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed
names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC
carrying a malformed client name to crash krb5kdc and deny authentication. (CVE-2026-107708)

- decode_sequence_of() in lib/krb5/asn.1/asn1_encode.c in MIT Kerberos 5 (aka krb5) 1.11 and later grows the
decoded element array one entry at a time, which allows remote attackers to cause a denial of service (CPU
consumption in the KDC) by sending an unauthenticated AS-REQ or TGS-REQ with a large number of elements in
a SEQUENCE OF field over TCP. (CVE-2026-119079)

- The policy RPC stubs in kadmin/server/server_stubs.c in MIT Kerberos 5 (aka krb5) 1.5.3 and later do not
reject a NULL policy name decoded by xdr_nullstring(), which allows remote authenticated users to cause a
denial of service (kadmind crash via NULL pointer dereference) by sending a policy request with an empty
policy name that reaches authorization checks or logging code. (CVE-2026-112318)

- krb5_ktkdb_get_entry() in lib/kdb/keytab.c in MIT Kerberos 5 (aka krb5) 1.2.8 and later does not free
decrypted key material when a post-decryption check fails, which allows remote attackers to cause a denial
of service (memory leak in the KDC or kadmind) via requests that repeatedly trigger key decryption
failures. (CVE-2026-112317)

Solution

Update the krb5 library and its related packages to version 1.22.3-r0 or later.

Plugin Details

Severity: High

ID: 478901

Version: Revision 1.1

Type: Local

Family: Alpine Linux Local Security Checks

Published: 11/10/2026

Updated: 11/10/2026

Supported Sensors: Agentless Assessment

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 92.81

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

CVSS v4

Risk Factor: High

Base Score: 7.1

Threat Score: 5.7

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-107778

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 4/28/2026

Reference Information

CVE: CVE-2026-107364, CVE-2026-107708, CVE-2026-107778, CVE-2026-107884, CVE-2026-111423, CVE-2026-112314, CVE-2026-112315, CVE-2026-112316, CVE-2026-112317, CVE-2026-112318, CVE-2026-112319, CVE-2026-112320, CVE-2026-112321, CVE-2026-112322, CVE-2026-112323, CVE-2026-118380, CVE-2026-119079, CVE-2026-40355, CVE-2026-40356, CVE-2026-71199, CVE-2026-71200

Detections

Analytics

Alpine: krb5: security update to 1.22.3-r0

high Tenable Cloud Security Plugin ID 478901

Description

Solution

See Also

Plugin Details

Risk Information

VPR

CVSS v2

CVSS v3

CVSS v4

Vulnerability Information

Reference Information