CVE-2006-3251
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.65%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 2.0
- 7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
- EPSS
- 3.65% probability · 90th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- hashcash/hashcash
- Source
- cve@mitre.org
EPSS 3.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://secunia.com/advisories/20800Vendor Advisory
- http://secunia.com/advisories/20846Vendor Advisory
- http://secunia.com/advisories/21146Vendor Advisory
- http://www.debian.org/security/2006/dsa-1114
- http://www.gentoo.org/security/en/glsa/glsa-200606-25.xml
- http://www.hashcash.org/source/CHANGELOG
- http://www.securityfocus.com/bid/18659Patch
- http://www.vupen.com/english/advisories/2006/2551Vendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/27422
- http://secunia.com/advisories/20800Vendor Advisory
- http://secunia.com/advisories/20846Vendor Advisory
- http://secunia.com/advisories/21146Vendor Advisory
- http://www.debian.org/security/2006/dsa-1114
- http://www.gentoo.org/security/en/glsa/glsa-200606-25.xml
- http://www.hashcash.org/source/CHANGELOG
- http://www.securityfocus.com/bid/18659Patch
- http://www.vupen.com/english/advisories/2006/2551Vendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/27422
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.