undici vulnerable to Denial of Service via unbounded memory in the EventSource parser

影響: npm:undici >= 6.5.0, < 6.29.1 → 6.29.1, npm:undici >= 7.0.0, < 7.30.1 → 7.30.1, npm:undici >= 8.0.0, < 8.12.2 → 8.12.2

undici's EventSource client can be driven to exhaust process memory by a malicious or compromised Server-Sent Events peer. By sending millions of tiny completed data: fields with no blank event separator, or a single unfinished line split across many chunks, the parser retains a growing amount of per-field and per-chunk state. The byte-based maxEventSize and maxResponseSize limits do not bound that retained state, and maxResponseSize is enforced on the compressed body before decompression, so a…

Read on GitHub Advisory Database

On 10/24/2026, 07:13 AM, GitHub Advisory Database published "undici vulnerable to Denial of Service via unbounded memory in the EventSource parser" (type: Advisory). Severity is "Medium" (medium). Related technologies: JavaScript / Node.js. CVE: CVE-2026-109924.