CWE-834: Excessive Iteration
The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed.
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Overview
If the iteration can be influenced by an attacker, this weakness could allow attackers to consume excessive resources such as CPU or memory. In many cases, a loop does not need to be infinite in order to cause enough resource consumption to adversely affect the product or its host system; it depends on the amount of resources consumed per iteration.
Real-world CVEs
29 recorded CVEs are caused by CWE-834 (Excessive Iteration). The highest-severity and most recent are shown first. 6 new CWE-834 CVEs have been recorded so far in 2026 (6 in 2025).
- CVE-2026-45680
OpenTelemetry eBPF Instrumentation: Unbounded BPF internal metrics replay can exhaust CPU
High · CVSS 7.5 · EPSS 24th2026-06-02 - CVE-2026-34043
Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects
High · CVSS 7.5 · EPSS 38th2026-03-31 - CVE-2025-67726
Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters