CVE-2026-24883 is identified as a vulnerability in GnuPG versions prior to 2.5.17. This vulnerability allows a long signature packet length to cause the function parse_signature to return success while setting sig->data[] to a NULL value. As a result, this can lead to a denial of service, specifically an application crash. The CVSS score assigned to this vulnerability is 3.7, categorizing it as low severity. While the base score indicates a low impact, organizations should not overlook the potential disruption it can cause.
The urgency for defenders is moderate; organizations should schedule remediation to ensure they are not vulnerable to this issue. The risk to organizations includes potential downtime and service interruption if the vulnerability is exploited. Due to the nature of the vulnerability, the attack vector is classified as network-based, which means it can be exploited remotely, although the complexity is rated as high, requiring specific conditions for successful exploitation.
Currently, there are no known exploits available in the wild, making immediate action less critical. However, proactive measures are always advisable in the realm of cybersecurity. Organizations should prioritize monitoring for any updates regarding this vulnerability and apply necessary patches as they become available.
It is imperative for security teams to stay informed and prepared. Delays in remediation can lead to increased risks and potential exploitation of vulnerabilities that may not yet be publicized. Therefore, organizations should take this vulnerability seriously and prepare to implement updates in their security practices.
Vulnerability Details
In GnuPG before version 2.5.17, a long signature packet length causes parse_signature to return success with sig->data[] set to a NULL value, leading to a denial of service (application crash). CVSS version 3.1 has provided a score of 3.7 with a low severity classification.
The affected products include GnuPG and Gpg4win. The publication date for this vulnerability was January 27, 2026.
Technical Analysis
The root cause of this vulnerability lies in the handling of signature packets. When an excessively long signature packet is parsed, the function does not correctly manage memory, resulting in a NULL pointer dereference. The attack vector is classified as network-based, indicating that an attacker could exploit this vulnerability remotely without direct access to the target system. The complexity of the attack is rated as high, meaning that specific conditions must be met for successful exploitation.
No privileges are required to exploit this vulnerability, and user interaction is not necessary, making it easier for potential attackers to initiate an exploit. The confidentiality and integrity of the system are not directly impacted, but the availability impact is rated as low, leading to application crashes.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2026-24883 includes the potential for application crashes, which can disrupt services and impact user experience. Organizations utilizing GnuPG and Gpg4win should be aware of the implications of this vulnerability as it could create a blast radius affecting all users of the affected systems.
The urgency assessment is moderate, as the CVSS score indicates a low severity level. However, organizations should not postpone remediation, particularly if GnuPG or Gpg4win is deployed in critical environments. Prompt action is advisable to mitigate any risks associated with this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of GnuPG range from 2.5.13 to versions prior to 2.5.17. For Gpg4win, the affected versions are from 5.0.0 to versions prior to 5.0.1.
Mitigation & Remediation
Organizations should prioritize patching by upgrading to GnuPG version 2.5.17 or later and Gpg4win version 5.0.1 or later to mitigate this vulnerability. Additionally, monitoring should be implemented to detect anomalies in application behavior that may indicate exploitation attempts.
If immediate patching is not feasible, organizations should consider configuration hardening to limit exposure to this vulnerability. Regular assessments through penetration testing can also help identify and mitigate vulnerabilities.
Detection Guidance
Organizations should monitor logs for indicators of unusual application behavior, particularly around the signature parsing functionality. Behavioral anomalies should be investigated promptly to determine if they are indicative of exploitation attempts. Network signatures related to this vulnerability should also be implemented to detect potential attacks.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-24883 lies in its representation of ongoing challenges in managing cryptographic software securely. As vulnerabilities in cryptographic libraries can lead to severe consequences, security teams should remain vigilant and proactive in their approach to identifying and addressing similar issues. This vulnerability serves as a reminder of the importance of keeping software up to date and conducting regular security assessments.
Organizations should also consider implementing a robust vulnerability management program to ensure timely identification and remediation of vulnerabilities. Continuous monitoring for new threats and vulnerabilities is essential in maintaining a secure environment. The evolving nature of cybersecurity threats demands that organizations stay informed and prepared.
For further insights, organizations can refer to resources such as the vulnerability management program and the penetration testing methodology which provide guidance on best practices for maintaining security.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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