CVE-2006-3251: Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow at...

Security readout for executives and security teams

Hashcash before 1.21 has a heap buffer overflow in its entry-handling code. If an affected system processes crafted entries, the bug might let an attacker run code. The bundle does not provide CVSS scoring, affected CPEs, or evidence of active exploitation. Exposure is most likely on systems that installed Hashcash before 1.21, especially where it processes untrusted or externally supplied entries. The source bundle does not identify specific distributions, package versions, or deployment patterns beyond Hashcash before 1.21. Prioritize remediation where Hashcash is installed and exposed to untrusted inputs. The business urgency is lower than a confirmed exploited internet-facing flaw, but potential code execution makes unpatched use unacceptable in production. Mitigation focus: Upgrade Hashcash to version 1.21 or later where available.; Apply relevant Debian or Gentoo security updates for packaged deployments.; Restrict processing of untrusted entries until fixed builds are verified..

Prepared

Jun 29, 2026, 11:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.