Vulnerability · Published May 1, 2026 · Assigned by mitre
CVE-2026-42484
Critical 9.8
In plain English
A critical-severity out-of-bounds write 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 0.4% (higher than 39% of all known vulnerabilities).
Official description
A heap-based buffer overflow in hex_to_binary in the PKZIP hash parser in hashcat v7.1.2 allows an attacker to cause a denial of service or possibly execute arbitrary code via a crafted PKZIP hash file. The issue affects modules 17200, 17210, 17220, 17225, and 17230. When data_type_enum<=1, attacker-controlled hex data from a user-supplied hash string is decoded into a fixed-size buffer without proper input-length validation.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | hashcat | no fix listed | DEBIAN-CVE-2026-42484 |
| Debian:13 | hashcat | no fix listed | DEBIAN-CVE-2026-42484 |
| Debian:14 | hashcat | no fix listed | DEBIAN-CVE-2026-42484 |
| Ubuntu:22.04:LTS | hashcat | no fix listed | UBUNTU-CVE-2026-42484 |
| Ubuntu:24.04:LTS | hashcat | no fix listed | UBUNTU-CVE-2026-42484 |
| Ubuntu:25.10 | hashcat | no fix listed | UBUNTU-CVE-2026-42484 |
| Ubuntu:26.04:LTS | hashcat | no fix listed | UBUNTU-CVE-2026-42484 |
| Ubuntu:26.10 | hashcat | no fix listed | UBUNTU-CVE-2026-42484 |
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H