SUSE SLED15: bouncycastle / bouncycastle-pg / bouncycastle-pkix / etc (SUSE-SU-2026:4797-1)

critical Nessus Plugin ID 370393

Synopsis

The remote SUSE host is missing one or more security updates.

Description

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4797-1 advisory.

- CVE-2026-17507: negative signed leaf_index values from unsigned wire encodings can cause heap exhaustion (bsc#1284075).
- CVE-2026-17508: unbounded KDF iteration and memory parameters can cause resource exhaustion (bsc#1284073).
- CVE-2026-18036: variable-time modulo and division operations in NTRU implementation can allow timing side-channel attacks (bsc#1284065).
- CVE-2026-18040: table lookups and variable-time duplicate scanning in HQC can cause cache side-channel leaks (bsc#1284205).
- CVE-2026-71885: unbound X.509 certificates in MLS LeafNode verification can cause identity impersonation and group message interception (bsc#1284165).
- CVE-2026-71886: unvalidated CERTIFY_OTHER flags in OpenPGP subkeys can cause unauthorized trust delegations and identity spoofing (bsc#1284212).
- CVE-2026-71887: missing primary key back-signature validation on subkeys can cause signature misattribution and trust context spoofing (bsc#1284213).
- CVE-2026-71888: disagreement between digestAlgorithm and authAttrs in CMS parsing can cause unauthenticated attribute injection (bsc#1284215).
- CVE-2026-71889: skipped leaf certificate evaluation in checkNameConstraints can cause X.509 name constraint bypasses (bsc#1284218).
- CVE-2026-71890: unbounded Remove proposals in external MLS commits can cause arbitrary group member eviction and session takeover (bsc#1284219).
- CVE-2026-71891: forged ECPoint curves in BLS12-381 key validation can cause aggregate signature verification bypasses (bsc#1284220).
- CVE-2026-71892: type mismatch in CMS key-transport validation can cause key-size enforcement bypasses for HKDF-derived content keys (bsc#1284221).
- CVE-2026-85515: laundered EOF exceptions in OpenPGP message stream processing can cause unregistered truncation errors and integrity check bypasses (bsc#1284222).
- CVE-2026-97873: unbounded iteration counts in legacy PBES1 and PKCS#12 PBE implementations can cause resource exhaustion (bsc#1284224).

Changes for bouncycastle:

- Updated to version 1.86.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected bouncycastle, bouncycastle-pg, bouncycastle-pkix and / or bouncycastle-util packages.

Plugin Details

Severity: Critical

ID: 370393

File Name: suse_SU-2026-4797-1.nasl

Version: 1.1

Type: Local

Agent: unix

Family: SuSE Local Security Checks

Published: 10/22/2026

Updated: 10/22/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.5

Percentile: 57.85

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-17507

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.1

Threat Vector: CVSS:4.0/E:U

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

CVSS Score Source: CVE-2026-71885

Vulnerability Information

CPE: cpe:/o:novell:suse_linux:15, p-cpe:/a:novell:suse_linux:bouncycastle-pg, p-cpe:/a:novell:suse_linux:bouncycastle-pkix, p-cpe:/a:novell:suse_linux:bouncycastle-util, p-cpe:/a:novell:suse_linux:bouncycastle

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: 10/21/2026

Vulnerability Publication Date: 10/2/2026

Reference Information

CVE: CVE-2026-17507, CVE-2026-17508, CVE-2026-18036, CVE-2026-18040, CVE-2026-71885, CVE-2026-71886, CVE-2026-71887, CVE-2026-71888, CVE-2026-71889, CVE-2026-71890, CVE-2026-71891, CVE-2026-71892, CVE-2026-85515, CVE-2026-97873

SuSE: SUSE-SU-2026:4797-1

Detections

Analytics