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openSUSE 16 Security Update : go-sendxmpp (openSUSE-SU-2026:21562-1)

high Nessus Plugin ID 335084

Synopsis

The remote openSUSE host is missing a security update.

Description

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:21562-1 advisory.

 Changes in go-sendxmpp:

 - Update to 0.17.0:
 * Add --ox-transfer-private-key to transfer the encrypted private key to PEP to transfer it to other devices (requires go-xmpp >= v0.3.7).
 * Add --ox-receive-private-key to receive the encrypted private key from PEP.
 * Add config option no_root_warning.
 * Add config option no_legacy_pgp_warning.
 * Also disable legacy PGP when running as root (Ox was already disabled).
 * Disable pinning for not using PLAIN when running as root.
 * Add config option ox_trust_mode with settings blind and tofu.
 * Due to new tofu trust mode for Ox, only one public key per contact is accepted for easier ID handling.
 * Ox: Check that fingerprint of received key equals the advertised one.
 * CVE-2026-39821: Failure to reject ASCII-only Punycode-encoded labels allows for validation bypass and privilege escalation (bsc#1266617): Bump net to 0.57.0

Tenable has extracted the preceding description block directly from the SUSE 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 go-sendxmpp package.

See Also

https://bugzilla.suse.com/1266617

https://www.suse.com/security/cve/CVE-2026-39821

Plugin Details

Severity: High

ID: 335084

File Name: openSUSE-2026-21562-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/13/2026

Updated: 8/13/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 57.7

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-39821

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: cpe:/o:novell:opensuse:16.0, p-cpe:/a:novell:opensuse:go-sendxmpp

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 8/11/2026

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2026-39821