CVE-2026-42483
CVE-2026-42483 is a critical-severity vulnerability in Hashcat with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- EPSS exploit prediction: 0% (22nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-26530
- Weakness: CWE-787
- Affected product: Hashcat
- Published:
- Last modified:
Description
A heap-based buffer overflow in the Kerberos hash parser in hashcat v7.1.2 allows an attacker to cause a denial of service or possibly execute arbitrary code via a crafted Kerberos hash file. The issue affects module_hash_decode in multiple Kerberos-related modules because account_info_len is calculated from untrusted delimiter positions without upper-bound validation before memcpy copies the data into a fixed-size account_info buffer.
Frequently asked questions
- What is CVE-2026-42483?
- A heap-based buffer overflow in the Kerberos hash parser in hashcat v7.1.2 allows an attacker to cause a denial of service or possibly execute arbitrary code via a crafted Kerberos hash file. The issue affects module_hash_decode in multiple Kerberos-related modules because account_info_len is calculated from untrusted delimiter positions without upper-bound validation before memcpy copies the data into a fixed-size account_info buffer.
- How severe is CVE-2026-42483?
- CVE-2026-42483 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-42483 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-42483?
- CVE-2026-42483 affects Hashcat. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-42483?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-42483 have an EU (EUVD) identifier?
- Yes. CVE-2026-42483 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26530.
- When was CVE-2026-42483 published?
- CVE-2026-42483 was published on 2026-05-01 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:hashcat:hashcat:7.1.2:*:*:*:*:*:*:*
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