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GnuTLS EUVDEUVD-2026-32012

| CVE-2026-42015 MEDIUM
Off-by-one Error (CWE-193)
2026-05-26 redhat
5.3
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SUSE
MEDIUM
qualitative
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

2
Analysis Generated
May 26, 2026 - 22:15 vuln.today
CVE Published
May 26, 2026 - 21:29 nvd
MEDIUM 5.3

DescriptionCVE.org

A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.

AnalysisAI

Memory corruption via an off-by-one error in GnuTLS PKCS#12 bag element handling exposes any application using GnuTLS to remote unauthenticated denial of service - and potentially unspecified further impact - when a crafted PKCS#12 structure is parsed. The CVSS vector (AV:N/AC:L/PR:N/UI:N) confirms exploitation requires no authentication, no user interaction, and no elevated complexity, making internet-exposed services that parse client-supplied PKCS#12 inputs the primary risk surface. No public exploit code exists and the vulnerability is not listed in the CISA KEV catalog at time of analysis.

Technical ContextAI

GnuTLS is a widely deployed open-source TLS/SSL and DTLS implementation used as the core cryptographic library across Red Hat Enterprise Linux distributions and derivative platforms. PKCS#12 is a binary container format (RFC 7292) used to bundle cryptographic objects - certificates, private keys, and CA chains - into transportable 'bags.' The root cause is CWE-193 (Off-by-One Error): the internal bounds check governing the bag element array does not correctly enforce a limit at exactly 32 elements, permitting a write one index beyond the allocated array boundary when a 33rd element is appended. This out-of-bounds write corrupts adjacent heap memory, which can destabilize or crash the host process. The flaw is confirmed present across GnuTLS as packaged in Red Hat Enterprise Linux 6 through 10 (CPE: cpe:2.3:a:red_hat:red_hat_enterprise_linux_6 through _10), Red Hat Hardened Images (cpe:2.3:a:red_hat:red_hat_hardened_images), and Red Hat OpenShift Container Platform 4 (cpe:2.3:a:red_hat:red_hat_openshift_container_platform_4). The upstream GnuTLS version range is not specified in the available CPE data.

RemediationAI

Apply the Red Hat-issued erratum for GnuTLS via standard yum/dnf patching channels; consult https://access.redhat.com/security/cve/CVE-2026-42015 for the specific RHSA advisory number and exact fixed package version, as that data was not present in the provided intelligence. An exact fixed GnuTLS version cannot be cited here without independent confirmation from the advisory. As a compensating control where immediate patching is not feasible, disable or restrict processing of externally-supplied PKCS#12 inputs: for TLS endpoints, this means disabling mutual TLS (client certificate authentication) until patched - note this will break PKI-based client authentication workflows. For OpenShift Container Platform 4 nodes, prioritize patching of control-plane and ingress nodes that terminate TLS from untrusted networks. Services that consume only PEM-formatted certificates and never parse PKCS#12 files are not directly exposed by this flaw and carry lower urgency.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-Base Image SL-Micro-Base-RT Image SL-Micro-Base-RT-SelfInstall Image SL-Micro-Base-RT-encrypted Image SL-Micro-Base-SelfInstall Image SL-Micro-Base-encrypted Image SL-Micro-Base-qcow Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Image SLES-Azure-3P Image SLES-Azure-Basic Image SLES-Azure-Standard Image SLES-BYOS-Azure Image SLES-BYOS-EC2 Image SLES-BYOS-GCE Image SLES-EC2 Image SLES-GCE Image SLES-GCE-3P Image SLES-Hardened-BYOS-Azure Image SLES-Hardened-BYOS-EC2 Image SLES-Hardened-BYOS-GCE Image SLES-SAPCAL-Azure Image SLES-SAPCAL-EC2 Image SLES-SAPCAL-GCE Affected
Image SLES-SAP-Azure Image SLES-SAP-Azure-3P Image SLES-SAP-BYOS-Azure Image SLES-SAP-BYOS-EC2 Image SLES-SAP-BYOS-GCE Image SLES-SAP-EC2 Image SLES-SAP-GCE Image SLES-SAP-GCE-3P Affected
SUSE Liberty Linux 8 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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EUVD-2026-32012 vulnerability details – vuln.today

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