CVE-2009-4355: Memory leak in the zlib_stateful_finish function in crypto/comp/c_zlib.c in OpenSSL 0.9.8l and earlier and...

Security readout for executives and security teams

CVE-2009-4355 is an old OpenSSL memory leak that can let a remote party consume server memory until a service fails. It affects OpenSSL 0.9.8l and earlier, plus 1.0.0 beta through beta 4. The source bundle describes denial of service only, not data theft or code execution. Exposure is most likely on legacy systems still running affected OpenSSL builds, especially internet-facing web or TLS services using OpenSSL compression paths. Modern supported distributions are unlikely to remain affected, but embedded appliances and old application stacks may persist. Treat this as a legacy hygiene and availability risk. It should not outrank actively exploited flaws, but any exposed unsupported OpenSSL service should be remediated promptly because denial of service can affect customer-facing systems. Mitigation focus: Inventory OpenSSL versions across servers, appliances, containers, and bundled application runtimes.; Apply vendor OpenSSL updates from the relevant OS or product advisory.; Retire unsupported OpenSSL 0.9.8-era and 1.0.0 beta deployments..

Prepared

Jun 28, 2026, 03:36 UTC (UTC+00:00)

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