hashcat 7.1.2 Rule File src/rp_cpu.c mangle_to_hex_lower/mangle_to_hex_upper buffer overflow

Summaryinfo

A vulnerability identified as critical has been detected in hashcat 7.1.2. Impacted is the function mangle_to_hex_lower/mangle_to_hex_upper of the file src/rp_cpu.c of the component Rule File Handler. This manipulation causes buffer overflow. This vulnerability is tracked as CVE-2026-42482. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability has been found in hashcat 7.1.2 and classified as critical. Affected by this vulnerability is the function mangle_to_hex_lower/mangle_to_hex_upper of the file src/rp_cpu.c of the component Rule File Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A stack-based buffer overflow in mangle_to_hex_lower() and mangle_to_hex_upper() in src/rp_cpu.c in hashcat v7.1.2 allows an attacker to cause a denial of service or possibly execute arbitrary code via a crafted rule file, or via the -j or -k rule options used with password candidates of 128 or more characters. The vulnerability is caused by a bounds check that fails to account for the 2x expansion that occurs when password bytes are converted to hexadecimal.

It is possible to read the advisory at gist.github.com. This vulnerability is known as CVE-2026-42482 since 04/27/2026. The exploitation appears to be difficult. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/01/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• hashcat

Version

• 7.1.2

CPE 2.3info

• 🔒

CPE 2.2info

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