Buffer overflow in Hashcat
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Hashcat — versions 7.1.2
Weakness classification (CWE)
References
- gist.github.com/sgInnora/107f2eb20367e47d58c911e38d56a91f (Exploit, Third Party Advisory, Mitigation)
Frequently asked questions
- What is CVE-2026-42483?
- CVE-2026-42483 is a critical-severity vulnerability in Hashcat, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-05-01.
- How severe is CVE-2026-42483?
- Critical severity. CVSS v3 base score is 9.8 out of 10.