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GnuPG CVE-2026-24882

HIGH
Stack-based Buffer Overflow (CWE-121)
2026-01-27 cve@mitre.org
Buffer Overflow Stack Overflow Gnupg Gpg4win
7.8
CVSS 3.1 · NVD
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Severity by source

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

Local socket access to tpm2daemon needs low privileges (AV:L/PR:L), no user interaction, and stack overflow yields full code execution in the daemon (C/I/A:H, scope unchanged).

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

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

10
Analysis Updated
Jun 30, 2026 - 05:57 vuln.today
v5 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 05:55 vuln.today
v4 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 05:53 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 05:53 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 30, 2026 - 03:23 vuln.today
cvss_changed
CVSS changed
Jun 30, 2026 - 03:23 NVD
8.4 (HIGH) 7.8 (HIGH)
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 06, 2026 - 17:50 vuln.today
Public exploit code
CVE Published
Jan 27, 2026 - 19:16 nvd
HIGH 8.4

DescriptionNVD

In GnuPG before 2.5.17, a stack-based buffer overflow exists in tpm2daemon during handling of the PKDECRYPT command for TPM-backed RSA and ECC keys.

AnalysisAI

Stack-based buffer overflow in GnuPG's tpm2daemon (versions before 2.5.17) allows a local attacker to corrupt the daemon's stack by sending a crafted PKDECRYPT command targeting TPM-backed RSA or ECC keys, potentially achieving arbitrary code execution in the daemon's context. The flaw affects GnuPG and the bundled Gpg4win distribution and has been patched by upstream and major Linux vendors (Red Hat, SUSE). Publicly available exploit code exists, though the EPSS score is negligible (0.01%) and it is not listed in CISA KEV (no public exploit identified as actively exploited in the wild).

Technical ContextAI

tpm2daemon is GnuPG's bridge component (introduced in the 2.3/2.5 development line) that proxies private-key operations to a Trusted Platform Module, allowing GnuPG private keys to be sealed to and operated by TPM 2.0 hardware. When gpg-agent needs to decrypt data with a TPM-backed key, it forwards a PKDECRYPT Assuan protocol command to tpm2daemon, which marshals the ciphertext and key parameters for the TPM. The vulnerability is a CWE-121 stack-based buffer overflow: while handling PKDECRYPT for RSA and ECC keys the daemon copies attacker-influenced data into a fixed-size stack buffer without adequate bounds checking, corrupting the saved return address and adjacent stack state. The affected code paths are present in GnuPG (cpe:2.3:a:gnupg:gnupg) and in the Gpg4win packaging (cpe:2.3:a:gpg4win:gpg4win).

RemediationAI

Vendor-released patch: upgrade to GnuPG 2.5.17 or later, which contains the upstream fix referenced in https://dev.gnupg.org/T8045 and the disclosure at https://www.openwall.com/lists/oss-security/2026/01/27/8. On Red Hat systems apply the updates in RHSA-2026:2719 / RHSA-2026:2753 (https://access.redhat.com/errata/RHSA-2026:2719); on SUSE apply SUSE-SU-2026:0434 or the corresponding 20179/20195/20444/20487 update; Gpg4win users should install the GnuPG-2.5.17-based release. If immediate patching is not possible, the practical compensating control is to avoid using TPM-backed keys - do not configure or migrate GnuPG private keys into the TPM, and stop or disable tpm2daemon so the vulnerable PKDECRYPT path is never reached (trade-off: TPM-sealed keys become unavailable and operations fall back to on-disk software keys). Additionally restrict local access to the host and the gpg-agent/tpm2daemon sockets to trusted users, since exploitation requires local interaction with the daemon.

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Same weakness CWE-121 – Stack-based Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/manager/5.0/x86_64/proxy-httpd:latest Container suse/manager/5.0/x86_64/proxy-salt-broker:latest Container suse/manager/5.0/x86_64/server:latest Container suse/multi-linux-manager/5.1/x86_64/proxy-httpd:5.1.2.8.15.2 Container suse/multi-linux-manager/5.1/x86_64/proxy-salt-broker:5.1.2.9.13.2 Container suse/multi-linux-manager/5.1/x86_64/server-saline:5.1.2.9.13.1 Container suse/multi-linux-manager/5.1/x86_64/server:5.1.2.8.13.2 Image SLES15-SP6-BYOS Image SLES15-SP6-BYOS-EC2 Image SLES15-SP6-HPC-BYOS Image SLES15-SP6-HPC-BYOS-EC2 Image SLES15-SP6-HPC-EC2 Image SLES15-SP6-Hardened-BYOS Image SLES15-SP6-Hardened-BYOS-EC2 Image SLES15-SP6-SAP-BYOS Image SLES15-SP6-SAP-BYOS-EC2 Image SLES15-SP6-SAP-Hardened-BYOS Image SLES15-SP6-SAP-Hardened-BYOS-EC2 Image SLES15-SP6-SAP-Hardened-EC2 Image SLES15-SP7-BYOS-EC2 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-GCE-3P Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE-3P Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image proxy-salt-broker-image Image server-image Image server-saline-image Affected
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.125 Container suse/sl-micro/6.0/base-os-container:2.1.3-7.94 Container suse/sl-micro/6.0/toolbox:13.2-9.67 Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.57 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.78 Image SL-Micro 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-Default Image SL-Micro-Default-SelfInstall Image SL-Micro-Default-encrypted Image SL-Micro-Default-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
Container suse/sles/16.0/toolbox:16.3-1.34 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-CHOST-BYOS-Aliyun Image SLES-CHOST-BYOS-Azure Image SLES-CHOST-BYOS-EC2 Image SLES-CHOST-BYOS-GCE Image SLES-CHOST-BYOS-GDC Image SLES-CHOST-BYOS-SAP-CCloud Image SLES-EC2 Image SLES-GCE Image SLES-Hardened-BYOS-Azure Image SLES-Hardened-BYOS-EC2 Image SLES-Hardened-BYOS-GCE 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-GCE Image SLES-SAPCAL-Azure Image SLES-SAPCAL-EC2 Image SLES-SAPCAL-GCE Affected
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
SUSE Linux Enterprise Server 15 SP6-LTSS Fixed

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CVE-2026-24882 vulnerability details – vuln.today
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