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GnuTLS EUVDEUVD-2025-20928

| CVE-2025-32988 HIGH
Double Free (CWE-415)
2025-07-10 secalert@redhat.com
Buffer Overflow Denial Of Service Gnutls Openshift Container Platform Enterprise Linux
8.2
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
vuln.today AI
8.2 HIGH

Crafted certificate is processed remotely with no auth or interaction (AV:N/AC:L/PR:N/UI:N); reliable impact is DoS (A:H) with allocator-dependent memory corruption (I:L) and no data disclosure (C:N).

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Ubuntu
MEDIUM
qualitative
SUSE
6.5 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Red Hat
6.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

9
Analysis Updated
Jun 25, 2026 - 05:28 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 25, 2026 - 05:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 25, 2026 - 05:22 vuln.today
cvss_changed
Severity Changed
Jun 25, 2026 - 05:22 NVD
MEDIUM HIGH
CVSS changed
Jun 25, 2026 - 05:22 NVD
6.5 (MEDIUM) 8.2 (HIGH)
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 16, 2026 - 06:52 euvd
EUVD-2025-20928
Analysis Generated
Mar 16, 2026 - 06:52 vuln.today
CVE Published
Jul 10, 2025 - 08:15 nvd
MEDIUM 6.5

DescriptionNVD

A flaw was found in GnuTLS. A double-free vulnerability exists in GnuTLS due to incorrect ownership handling in the export logic of Subject Alternative Name (SAN) entries containing an otherName. If the type-id OID is invalid or malformed, GnuTLS will call asn1_delete_structure() on an ASN.1 node it does not own, leading to a double-free condition when the parent function or caller later attempts to free the same structure.

This vulnerability can be triggered using only public GnuTLS APIs and may result in denial of service or memory corruption, depending on allocator behavior.

AnalysisAI

Memory corruption and denial of service in GnuTLS arises from a double-free (CWE-415) in the code that exports X.509 Subject Alternative Name entries containing an otherName field. When the type-id OID inside such an entry is invalid or malformed, GnuTLS calls asn1_delete_structure() on an ASN.1 node it does not own, so the same structure is freed again by the calling function, corrupting allocator state. The flaw is reachable through public GnuTLS APIs - meaning any application that parses or re-exports an attacker-supplied certificate is exposed - and there is no public exploit identified at time of analysis (EPSS 0.04%, 12th percentile; not in CISA KEV).

Technical ContextAI

GnuTLS is a widely used GNU TLS/SSL and X.509 library that underpins certificate handling for much of the Linux ecosystem (the CPE set spans Red Hat Enterprise Linux 6 through 10, OpenShift Container Platform, plus Ubuntu and Debian packagings). The defect is a classic CWE-415 double-free rooted in incorrect ownership semantics: GnuTLS's libtasn1-backed ASN.1 handling exports SAN otherName entries, and on encountering a malformed/invalid type-id OID the export path invokes asn1_delete_structure() against a node whose lifetime is actually owned by the parent/caller. The caller subsequently frees the same node, producing two frees of one allocation. Whether this manifests as a clean crash or as exploitable heap corruption depends entirely on the underlying allocator's behavior, as the description explicitly notes.

RemediationAI

Apply the vendor-released GnuTLS package update for your distribution: on RHEL upgrade GnuTLS to at least 3.6.16-8.el8_10.4 (RHEL 8), 3.8.3-6.el9_6.2 (RHEL 9), or 3.8.9-9.el10_0.14 (RHEL 10) per the Red Hat errata at https://access.redhat.com/security/cve/CVE-2025-32988, and use the matching E4S/EUS builds (3.7.6-21.el9_2.4, 3.8.3-4.el9_4.4) where applicable; on Ubuntu apply USN-7635-1/USN-7742-1 (https://ubuntu.com/security/notices/USN-7635-1) and on Debian apply DSA-5962-1 / DLA-4267-1. After patching, restart or redeploy long-running services (and rebuild affected container images such as Discovery 2, Insights proxy 1.5, Ceph Storage 7) so they load the fixed library. If immediate patching is not possible, the practical compensating control is to avoid feeding untrusted certificates into the vulnerable SAN otherName export path - for example, restrict or disable client-certificate authentication and any feature that parses/re-exports externally supplied certificates, and front-end TLS termination with an unaffected proxy - accepting the trade-off that disabling mutual-TLS or certificate inspection reduces functionality and authentication assurance.

More in Gnutls

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CVE-2021-20231 CRITICAL POC
9.8 Mar 12

A flaw was found in gnutls. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentic
CVE-2014-3466 MEDIUM POC
6.8 Jun 03

Buffer overflow in the read_server_hello function in lib/gnutls_handshake.c in GnuTLS before 3.1.25, 3.2.x before 3.2.15
CVE-2024-0553 HIGH POC
7.5 Jan 16

A vulnerability was found in GnuTLS. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no auth
CVE-2012-1663 HIGH POC
7.5 Mar 13

Double free vulnerability in libgnutls in GnuTLS before 3.0.14 allows remote attackers to cause a denial of service (app
CVE-2020-24659 HIGH POC
7.5 Sep 04

An issue was discovered in GnuTLS before 3.6.15. Rated high severity (CVSS 7.5), this vulnerability is remotely exploita
CVE-2019-3836 HIGH POC
7.5 Apr 01

It was discovered in gnutls before version 3.6.7 upstream that there is an uninitialized pointer access in gnutls versio
CVE-2019-3829 HIGH POC
7.5 Mar 27

A vulnerability was found in gnutls versions from 3.5.8 before 3.6.7. Rated high severity (CVSS 7.5), this vulnerability
CVE-2023-0361 HIGH POC
7.4 Feb 15

A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. Rated high severity (C
CVE-2012-1569 MEDIUM POC
5.0 Mar 26

The asn1_get_length_der function in decoding.c in GNU Libtasn1 before 2.12, as used in GnuTLS before 3.0.16 and other pr
CVE-2017-5334 CRITICAL
9.8 Mar 24

Double free vulnerability in the gnutls_x509_ext_import_proxy function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 al
CVE-2012-1573 MEDIUM POC
5.0 Mar 26

gnutls_cipher.c in libgnutls in GnuTLS before 2.12.17 and 3.x before 3.0.15 does not properly handle data encrypted with
CVE-2017-5336 CRITICAL
9.8 Mar 24

Stack-based buffer overflow in the cdk_pk_get_keyid function in lib/opencdk/pubkey.c in GnuTLS before 3.3.26 and 3.5.x b

Same weakness CWE-415 – Double Free

View all
CVE-2014-0502 HIGH POC
8.8
CVE-2023-25136 MEDIUM POC
6.5
CVE-2014-1767 HIGH POC
7.2
CVE-2016-5768 CRITICAL POC
9.8
CVE-2016-5772 CRITICAL POC
9.8
CVE-2016-3132 CRITICAL POC
9.8
CVE-2017-6074 HIGH POC
7.8
CVE-2017-9287 MEDIUM POC
6.5

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2017-11882 HIGH POC
7.8
CVE-2010-3333 HIGH POC
7.8

Vendor StatusVendor

Ubuntu

Priority: Medium
gnutls28
Release Status Version
upstream released 3.8.9-3
jammy released 3.7.3-4ubuntu1.7
noble released 3.8.3-1.1ubuntu3.4
plucky released 3.8.9-2ubuntu3.1
oracular ignored end of life, was needs-triage
xenial not-affected code not present
bionic released 3.5.18-1ubuntu1.6+esm2
focal released 3.6.13-2ubuntu1.12+esm1
questing released 3.8.9-3ubuntu1
USN-7635-1 USN-7742-1

Debian

gnutls28
Release Status Fixed Version Urgency
bullseye fixed 3.7.1-5+deb11u8 -
bullseye (security) fixed 3.7.1-5+deb11u9 -
bookworm fixed 3.7.9-2+deb12u5 -
bookworm (security) fixed 3.7.9-2+deb12u6 -
trixie (security), trixie fixed 3.8.9-3+deb13u2 -
forky, sid fixed 3.8.12-3 -
(unstable) fixed 3.8.9-3 -
DLA-4267-1 DSA-5962-1

SUSE

Severity: Medium
Product Status
Container bci/kiwi:latest Container bci/spack:0.23.1-11.31 Container containers/lmcache-vllm-openai:0.3.2-1.2 Container containers/open-webui:0.6.9-11.8 Container containers/vllm-openai:0.9.1-1.2 Container suse/manager/5.0/x86_64/server:5.0.5.1.7.33.2 Container suse/multi-linux-manager/5.1/x86_64/server:5.1.1.8.7.1 Image SLES15-SP6 Image SLES15-SP6-Azure-3P Image SLES15-SP6-Azure-Basic Image SLES15-SP6-Azure-Standard Image SLES15-SP6-BYOS Image SLES15-SP6-BYOS-Azure Image SLES15-SP6-BYOS-EC2 Image SLES15-SP6-BYOS-GCE Image SLES15-SP6-CHOST-BYOS Image SLES15-SP6-CHOST-BYOS-Aliyun Image SLES15-SP6-CHOST-BYOS-Azure Image SLES15-SP6-CHOST-BYOS-EC2 Image SLES15-SP6-CHOST-BYOS-GCE Image SLES15-SP6-CHOST-BYOS-GDC Image SLES15-SP6-CHOST-BYOS-SAP-CCloud Image SLES15-SP6-EC2 Image SLES15-SP6-EC2-ECS-HVM Image SLES15-SP6-GCE Image SLES15-SP6-HPC Image SLES15-SP6-HPC-Azure Image SLES15-SP6-HPC-BYOS Image SLES15-SP6-HPC-BYOS-Azure Image SLES15-SP6-HPC-BYOS-EC2 Image SLES15-SP6-HPC-BYOS-GCE Image SLES15-SP6-HPC-EC2 Image SLES15-SP6-HPC-GCE Image SLES15-SP6-Hardened-BYOS Image SLES15-SP6-Hardened-BYOS-Azure Image SLES15-SP6-Hardened-BYOS-EC2 Image SLES15-SP6-Hardened-BYOS-GCE Image SLES15-SP6-SAP Image SLES15-SP6-SAP-Azure Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-EC2 Image SLES15-SP6-SAP-GCE Image SLES15-SP6-SAPCAL Image SLES15-SP6-SAPCAL-Azure Image SLES15-SP6-SAPCAL-EC2 Image SLES15-SP6-SAPCAL-GCE Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-EC2 Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-GCE-3P Image SLES15-SP7-HPC-Azure Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-GCE-3P Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Image ai_15_6 Image server-image Affected
Container suse/sl-micro/6.0/baremetal-os-container:latest Affected
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 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 SLES15-SP3-Micro-5-2-BYOS-Azure Image SLES15-SP3-Micro-5-2-BYOS-EC2-HVM Image SLES15-SP3-Micro-5-2-BYOS-GCE Affected
Image SLES15-SP4-BYOS Image SLES15-SP4-BYOS-Azure Image SLES15-SP4-BYOS-EC2 Image SLES15-SP4-BYOS-GCE Image SLES15-SP4-CHOST-BYOS Image SLES15-SP4-CHOST-BYOS-Aliyun Image SLES15-SP4-CHOST-BYOS-Azure Image SLES15-SP4-CHOST-BYOS-EC2 Image SLES15-SP4-CHOST-BYOS-GCE Image SLES15-SP4-CHOST-BYOS-SAP-CCloud Image SLES15-SP4-HPC-BYOS Image SLES15-SP4-HPC-BYOS-Azure Image SLES15-SP4-HPC-BYOS-EC2 Image SLES15-SP4-HPC-BYOS-GCE Image SLES15-SP4-HPC-EC2 Image SLES15-SP4-HPC-GCE Image SLES15-SP4-Hardened-BYOS Image SLES15-SP4-Hardened-BYOS-Azure Image SLES15-SP4-Hardened-BYOS-EC2 Image SLES15-SP4-Hardened-BYOS-GCE Image SLES15-SP4-Manager-Proxy-4-3-BYOS Image SLES15-SP4-Manager-Proxy-4-3-BYOS-Azure Image SLES15-SP4-Manager-Proxy-4-3-BYOS-EC2 Image SLES15-SP4-Manager-Proxy-4-3-BYOS-GCE Image SLES15-SP4-Manager-Server-4-3-BYOS Image SLES15-SP4-Manager-Server-4-3-BYOS-Azure Image SLES15-SP4-Manager-Server-4-3-BYOS-EC2 Image SLES15-SP4-Manager-Server-4-3-BYOS-GCE Image SLES15-SP4-Micro-5-4 Image SLES15-SP4-Micro-5-4-BYOS Image SLES15-SP4-Micro-5-4-BYOS-Azure Image SLES15-SP4-Micro-5-4-BYOS-EC2 Image SLES15-SP4-Micro-5-4-BYOS-GCE Image SLES15-SP4-Micro-5-4-EC2 Image SLES15-SP4-Micro-5-4-GCE Image SLES15-SP4-SAP Image SLES15-SP4-SAP-Azure Image SLES15-SP4-SAP-Azure-LI-BYOS Image SLES15-SP4-SAP-Azure-LI-BYOS-Production Image SLES15-SP4-SAP-Azure-VLI-BYOS Image SLES15-SP4-SAP-Azure-VLI-BYOS-Production Image SLES15-SP4-SAP-EC2 Image SLES15-SP4-SAP-GCE Image SLES15-SP4-SAPCAL Image SLES15-SP4-SAPCAL-Azure Image SLES15-SP4-SAPCAL-EC2 Image SLES15-SP4-SAPCAL-GCE Image SLES15-SP5-Azure-3P Image SLES15-SP5-Azure-Basic Image SLES15-SP5-Azure-Standard Image SLES15-SP5-BYOS-Azure Image SLES15-SP5-BYOS-EC2 Image SLES15-SP5-BYOS-GCE Image SLES15-SP5-CHOST-BYOS-Aliyun Image SLES15-SP5-CHOST-BYOS-Azure Image SLES15-SP5-CHOST-BYOS-EC2 Image SLES15-SP5-CHOST-BYOS-GCE Image SLES15-SP5-CHOST-BYOS-GDC Image SLES15-SP5-CHOST-BYOS-SAP-CCloud Image SLES15-SP5-EC2 Image SLES15-SP5-GCE Image SLES15-SP5-HPC-Azure Image SLES15-SP5-HPC-BYOS-Azure Image SLES15-SP5-HPC-BYOS-EC2 Image SLES15-SP5-HPC-BYOS-GCE Image SLES15-SP5-Hardened-BYOS-Azure Image SLES15-SP5-Hardened-BYOS-EC2 Image SLES15-SP5-Hardened-BYOS-GCE Image SLES15-SP5-Manager-Proxy-5-0-BYOS Image SLES15-SP5-Manager-Proxy-5-0-BYOS-Azure Image SLES15-SP5-Manager-Proxy-5-0-BYOS-EC2 Image SLES15-SP5-Manager-Proxy-5-0-BYOS-GCE Image SLES15-SP5-Manager-Server-5-0 Image SLES15-SP5-Manager-Server-5-0-Azure-llc Image SLES15-SP5-Manager-Server-5-0-Azure-ltd Image SLES15-SP5-Manager-Server-5-0-BYOS Image SLES15-SP5-Manager-Server-5-0-BYOS-Azure Image SLES15-SP5-Manager-Server-5-0-BYOS-EC2 Image SLES15-SP5-Manager-Server-5-0-BYOS-GCE Image SLES15-SP5-Manager-Server-5-0-EC2-llc Image SLES15-SP5-Manager-Server-5-0-EC2-ltd Image SLES15-SP5-Micro-5-5 Image SLES15-SP5-Micro-5-5-Azure Image SLES15-SP5-Micro-5-5-BYOS Image SLES15-SP5-Micro-5-5-BYOS-Azure Image SLES15-SP5-Micro-5-5-BYOS-EC2 Image SLES15-SP5-Micro-5-5-BYOS-GCE Image SLES15-SP5-Micro-5-5-EC2 Image SLES15-SP5-Micro-5-5-GCE Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP5-SAPCAL-Azure Image SLES15-SP5-SAPCAL-EC2 Image SLES15-SP5-SAPCAL-GCE Affected

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EUVD-2025-20928 vulnerability details – vuln.today
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