Vulnerability · Published May 1, 2026 · Assigned by mitre
CVE-2026-42483
High 7.3
In plain English
A high-severity heap buffer overflow in the hashcat package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | hashcat | no fix listed | DEBIAN-CVE-2026-42483 |
| Debian:13 | hashcat | no fix listed | DEBIAN-CVE-2026-42483 |
| Debian:14 | hashcat | no fix listed | DEBIAN-CVE-2026-42483 |
| Ubuntu:22.04:LTS | hashcat | no fix listed | UBUNTU-CVE-2026-42483 |
| Ubuntu:24.04:LTS | hashcat | no fix listed | UBUNTU-CVE-2026-42483 |
| Ubuntu:25.10 | hashcat | no fix listed | UBUNTU-CVE-2026-42483 |
| Ubuntu:26.04:LTS | hashcat | no fix listed | UBUNTU-CVE-2026-42483 |
| Ubuntu:26.10 | hashcat | no fix listed | UBUNTU-CVE-2026-42483 |
Affected products (as reported)
Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L