CVE-2006-3251
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21...
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.
Exploit likelihood
What each source reports
NVD Score used
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.
- Record
CVE-2006-3251- CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-119
- Updated
- 2026-11-02
CVE List No score
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.
- Record
CVE-2006-3251- Updated
- 2026-11-02
EUVDEUVD-2006-3248 No score
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.
- Record
EUVD-2006-3248- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f7fm-rw62-26cq No score
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21...
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.
- Record
GHSA-f7fm-rw62-26cq- Weakness
- CWE-119
- Updated
- 2026-11-02
OSV No score
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.
- Record
CVE-2006-3251- Updated
- 2026-11-02
OSVDEBIAN-CVE-2006-3251 No score
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.
- Record
DEBIAN-CVE-2006-3251- Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2006-3251 is a high vulnerability (CVSS 7.5) in Hashcash, published June 27, 2006. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.65%, the 89th percentile. Fixed in hashcash 1.21.