In GnuPG before version 2.5.17, a stack-based buffer overflow exists in the tpm2daemon during handling of the PKDECRYPT command for TPM-backed RSA and ECC keys. This vulnerability has a CVSS score of 8.4, categorizing it as high severity. Organizations using GnuPG and Gpg4win should recognize the potential for significant risk due to this flaw, particularly in contexts where sensitive cryptographic operations are performed.
Risk to organizations includes unauthorized access to sensitive data, as attackers may leverage this vulnerability to execute arbitrary code, leading to potential data breaches or loss of integrity. Given the importance of cryptographic tools in securing communications and data, the urgency for defenders is high. Organizations should prioritize patching immediately.
Currently, there are no public exploits confirmed for this vulnerability, indicating that while the risk is present, it may not yet be actively targeted by attackers. Nevertheless, the potential for exploitation demands immediate attention from security teams to safeguard their environments.
Organizations utilizing GnuPG or Gpg4win should review their systems and implement the necessary updates as soon as possible to mitigate this vulnerability and protect their data integrity.
Vulnerability Details
The GnuPG vulnerability CVE-2026-24882 is characterized as a stack-based buffer overflow, which can be exploited under specific conditions. The affected versions include all prior to 2.5.17. The CVSS score of 8.4 indicates a high severity level, with significant impacts on confidentiality, integrity, and availability.
The vulnerability specifically affects the handling of the PKDECRYPT command within the tpm2daemon, indicating a critical security flaw in cryptographic operations. The vulnerability was published on January 27, 2026, and is classified under CWE-121, which pertains to stack-based buffer overflow issues.
Technical Analysis
The root cause of CVE-2026-24882 lies in improper handling of input within the tpm2daemon process. The attack vector is local, meaning an attacker must have local access to the system to exploit the vulnerability. The attack complexity is considered low, and no special privileges or user interaction are required to trigger the vulnerability.
The implications of this vulnerability are severe, with high potential impacts on confidentiality, integrity, and availability. Attackers could exploit this flaw to execute arbitrary code, allowing them to compromise the system's security and potentially gain access to sensitive data.
Risk & Impact Analysis
The real-world risk associated with this vulnerability is significant. Organizations relying on GnuPG and Gpg4win must consider the potential for data exposure and loss of integrity, particularly in environments where sensitive cryptographic functions are performed. The blast radius could extend to any system utilizing these tools, amplifying the potential consequences of a successful exploit.
Considering the urgency of the situation, organizations should address this vulnerability in their priority patch cycle. The CVSS score and nature of the vulnerability emphasize the need for immediate action to prevent possible exploitation.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of GnuPG prior to 2.5.17 and Gpg4win versions prior to 5.0.1 are affected by this vulnerability. Organizations should ensure they update to the latest versions to mitigate the risk associated with this flaw.
Mitigation & Remediation
To remediate this vulnerability, organizations should immediately update to GnuPG version 2.5.17 or later and Gpg4win version 5.0.1 or later. If patches are not available, organizations should consider implementing workarounds such as restricting access to the affected components and applying configuration hardening to limit exposure.
In addition, continuous security monitoring should be employed to detect any unusual activity that could indicate an exploit attempt. Organizations can enhance their security posture by adopting continuous security testing practices to ensure vulnerabilities are identified and addressed proactively.
Detection Guidance
Organizations should monitor logs for any indicators of exploitation attempts related to the PKDECRYPT command. Behavioral anomalies in the tpm2daemon process and unexpected network traffic may also serve as indicators of compromise. Proper configuration and regular audits can help detect changes in system behavior, contributing to a stronger security posture.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-24882 is noteworthy as it highlights vulnerabilities in widely used cryptographic tools. The pattern of buffer overflow vulnerabilities in security software calls for enhanced scrutiny during development and testing phases.
Security teams should learn from this incident and implement rigorous testing protocols to identify similar weaknesses in their applications. For further insights into vulnerability management, organizations can refer to the vulnerability management program and consider adopting best practices for effective incident response.
In conclusion, organizations should recognize the importance of securing cryptographic tools and prioritize proactive security measures to mitigate risks. Engaging in penetration testing can help identify vulnerabilities before they can be exploited.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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