CVE-2026-41990 is a medium severity vulnerability found in GnuPG's libgcrypt, specifically affecting versions prior to 1.12.2. The vulnerability is characterized by mishandling of Dilithium signing. The issue arises from writes to a static array that lack a bounds check, although it does not utilize attacker-controlled data. This vulnerability was published on April 23, 2026, and has been analyzed for its potential impact.
The CVSS score for this vulnerability is 4.0, indicating a medium severity level. This score is significant as it highlights the risk associated with the vulnerability, particularly in local environments where its exploitation could lead to integrity and availability impacts. Organizations should take note of this risk, as it underscores the importance of maintaining updated software versions.
Risk to organizations includes potential data integrity issues and availability concerns. The high attack complexity means that although exploitation might not be straightforward, the consequences could be severe if an attacker successfully leverages the vulnerability. Therefore, organizations should prioritize patching this vulnerability as part of their routine maintenance.
Currently, there is no known public exploit for CVE-2026-41990, and it is not listed in the Known Exploited Vulnerabilities (KEV) catalog. This situation indicates that while the vulnerability is serious, it may not be actively targeted by threat actors at this time. Nevertheless, organizations should remain vigilant and ensure they are prepared to address vulnerabilities promptly.
Organizations should address this vulnerability in their priority patch cycle, given the potential risk to data integrity and availability.
Vulnerability Details
The official description of this vulnerability states: 'Libgcrypt before 1.12.2 mishandles Dilithium signing. Writes to a static array lack a bounds check but do not use attacker-controlled data.' The vulnerability is classified under CWE-787, indicating improper bounds checking.
The CVSS score of 4.0 reflects a medium severity level, which is attributed to a local attack vector and high attack complexity. No privileges or user interaction are required to exploit this vulnerability, which increases its risk potential. The impacts on confidentiality are none, while integrity and availability impacts are low.
Affected versions include all versions of libgcrypt prior to 1.12.2. Organizations using this library should ensure that they are operating on a patched version to mitigate the risk.
Technical Analysis
The root cause of CVE-2026-41990 is a lack of bounds checking for writes to a static array in the libgcrypt library. This flaw can lead to unintended behavior during the signing process, particularly when handling the Dilithium algorithm. The attack vector is local, meaning an attacker must have access to the system where libgcrypt is installed.
With a high attack complexity, it would require specific conditions to be met for exploitation, such as knowledge of the underlying system and potentially manipulating the state of the library. No privileges are required, and no user interaction is necessary, which means that an attacker with local access could leverage this vulnerability without any additional steps.
The impact on confidentiality is non-existent, while the integrity impact is categorized as low, meaning that there could be some alteration to data integrity without a complete compromise. Availability impact is also low, indicating that the service remains generally available despite the vulnerability.
Risk & Impact Analysis
The potential risk to organizations deploying libgcrypt is significant. Should an attacker leverage this vulnerability effectively, they could induce data integrity issues, although the lack of bounds checking does not allow for arbitrary data manipulation. The low availability impact suggests that services remain operational, but the integrity aspect raises alarms about the trustworthiness of the signed data.
Given the low likelihood of exploitation based on current intelligence, organizations may consider implementing mitigations as part of their regular security practices. However, organizations should remain aware that the risk profile could change, and they should continuously monitor for updates regarding this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of libgcrypt include all versions prior to 1.12.2. Organizations should verify their installations and ensure they are using the latest patched version to mitigate potential risks.
Mitigation & Remediation
To remediate this vulnerability, organizations should update libgcrypt to version 1.12.2 or later. If a patch is not immediately available, consider implementing workarounds such as restricting access to the affected systems or utilizing alternative libraries that do not exhibit this vulnerability. Configuration hardening and network controls should also be evaluated to protect against potential exploitation.
For organizations seeking to validate their security posture, engaging in periodic security assessments such as penetration testing can help identify similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for any unusual activities associated with libgcrypt, especially around the signing operations. Look for behavioral anomalies that may indicate exploitation attempts and maintain network signatures that can identify unauthorized modifications to signed data.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-41990 lies in its potential to compromise integrity in cryptographic operations if not addressed. This vulnerability represents a broader trend of vulnerabilities in cryptographic libraries, highlighting the importance of secure coding practices. Security teams should learn from this incident to enhance their defensive strategies against similar vulnerabilities in the future.
For further information on securing cryptographic implementations, consider reviewing best practices in security testing and engaging in penetration testing methodology for comprehensive assessments.
Organizations should also consider continuous monitoring strategies to enhance their security posture, as vulnerabilities like CVE-2026-41990 may evolve over time.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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