Buffer overflow in Hashcat
CVE-2026-68765
hashcat master branch builds after v7.1.2 contain a heap buffer overflow vulnerability in the KeePass AESKDF/KDBX v4 module (module 34301) that allows attackers to corrupt adjacent heap memory by supplying an oversized ninth hash field token. The module accepts up to 600 hex characters for the ninth token field but decodes it into a fixed 256-byte buffer with no length check, allowing a maximal input to write up to 44 bytes past the buffer boundary into adjacent esalt fields and heap chunk metadata, potentially enabling heap corruption or memory access violations.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.002 (6.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- Hashcat — versions ef52453, 7.1.2
Weakness classification (CWE)
References
- github.com/hashcat/hashcat (product, patch)
- github.com/hashcat/hashcat/pull/4755 (issue-tracking, product)
- github.com/hashcat/hashcat/commit/6f374c4ff7d5dc951530fbbbcf6b45e3c169b100 (patch)
- www.vulncheck.com/advisories/hashcat-keepass-kdbx-v4-module-heap-buffer-overflo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-68765?
- CVE-2026-68765 is a medium-severity vulnerability in Hashcat, classified under Heap-based Buffer Overflow. CVSS score: 6.1/10. Published 2026-08-17.
- How severe is CVE-2026-68765?
- Medium severity. CVSS v3 base score is 6.1 out of 10.