CVE-2026-42482 is a critical vulnerability identified in Hashcat v7.1.2. This vulnerability allows an attacker to exploit a stack-based buffer overflow in the functions mangle_to_hex_lower() and mangle_to_hex_upper() present in src/rp_cpu.c. The exploitation can occur via a crafted rule file or through the use of the -j or -k rule options when using password candidates of 128 or more characters. This vulnerability arises due to a bounds check that fails to account for the 2x expansion that occurs when converting password bytes to hexadecimal.
The vulnerability has a CVSS score of 9.8, indicating a critical severity level. The attack vector is classified as network-based, and the complexity of the attack is low, meaning that an attacker with no privileges and without user interaction can exploit it. The potential impacts include high confidentiality, integrity, and availability risks, which makes this a serious concern for organizations relying on Hashcat.
As of now, there is no known exploit or public proof-of-concept for this vulnerability. However, the potential for remote code execution makes it imperative for organizations to address this vulnerability promptly. Organizations should prioritize patching immediately to mitigate the associated risks.
Defenders are urged to monitor for any signs of exploitation and to implement appropriate mitigations to shield their environments from potential threats stemming from this vulnerability.
Vulnerability Details
The official description of CVE-2026-42482 states that it is a stack-based buffer overflow vulnerability found in the Hashcat application. The vulnerability is rooted in a failure to properly check bounds when converting password bytes to hexadecimal. This oversight can lead to denial of service or potentially arbitrary code execution if an attacker supplies a specially crafted input.
The vulnerability is classified under CWE-787 (Out-of-bounds Write) and CWE-121 (Stack-based Buffer Overflow). The CVSS base score of 9.8 signifies its critical nature, indicating that it poses a significant risk to affected systems.
The affected product is Hashcat version 7.1.2, and organizations using this version are advised to upgrade to the patched version as soon as it becomes available.
Technical Analysis
The root cause of CVE-2026-42482 is a stack-based buffer overflow that occurs in the functions responsible for converting password bytes into hexadecimal representation. The vulnerability is triggered when an attacker provides a crafted rule file that exceeds the expected bounds, leading to potential memory corruption.
The attack vector for this vulnerability is network-based, allowing remote attackers to exploit it without requiring physical access to the target system. The complexity of the attack is low because it does not require advanced skills or privileges. User interaction is also not required, making it easier for attackers to leverage this vulnerability.
In terms of impact, successful exploitation can lead to high confidentiality, integrity, and availability impacts, as attackers may execute arbitrary code or cause denial of service. Organizations must consider the blast radius of this vulnerability, as it could affect multiple systems if not patched promptly.
Risk & Impact Analysis
The risk to organizations includes potential unauthorized access and system compromise due to the critical nature of CVE-2026-42482. Given the high CVSS score, organizations that utilize Hashcat v7.1.2 are at significant risk, particularly if they process sensitive data or are part of critical infrastructure.
The blast radius of this vulnerability is significant, as it can allow an attacker to execute arbitrary code remotely, which can lead to widespread impacts across affected systems. Organizations should assess their exposure and prioritize patching efforts accordingly.
Given the urgency of this vulnerability, organizations should address it in their priority patch cycle. The critical nature of the vulnerability, combined with the potential for widespread exploitation, necessitates immediate attention.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version of Hashcat is version 7.1.2. Organizations using this version should be aware of this vulnerability and take immediate action to remediate it. If version information is missing, state that all versions prior to the vendor patch are affected.
Mitigation & Remediation
Organizations should prioritize patching Hashcat to the latest version as soon as it becomes available to remediate CVE-2026-42482. If a patch is not immediately available, consider implementing workarounds such as restricting access to the application or using alternative security controls.
Additionally, organizations can enhance security by hardening configurations, enforcing network controls, and monitoring for any unusual activity related to Hashcat usage. For ongoing security validation, organizations should invest in continuous penetration testing to identify vulnerabilities before they can be exploited.
Detection Guidance
To effectively detect potential exploitation of CVE-2026-42482, organizations should monitor logs for any unusual activity patterns related to Hashcat. Look for behavioral anomalies that may indicate an attempt to exploit the vulnerability.
Additionally, implement network signatures that can help identify malicious attempts to trigger this vulnerability. Monitoring system changes during Hashcat operations can also provide insights into potential exploitation.
AppSecure Threat Intelligence Insight
CVE-2026-42482 represents a critical vulnerability within Hashcat that underscores the importance of vigilant security practices. The stack-based buffer overflow is a reminder of the ongoing need for robust coding practices and thorough testing to prevent similar vulnerabilities in the future.
Organizations should take this opportunity to review their security posture and enhance their vulnerability management strategies. This includes investing in vulnerability management programs to ensure they are prepared against emerging threats.
Moreover, implementing regular reviews and updates to security practices will help organizations stay ahead of evolving threats. For a comprehensive approach, consider strategies outlined in the penetration testing methodology to identify and address vulnerabilities proactively.
In conclusion, CVE-2026-42482 not only highlights a specific risk within Hashcat but also emphasizes the broader necessity for organizations to adopt a proactive stance in their cybersecurity strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)