Quick answers
- Is CVE-2026-115701 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-115701 being exploited in the wild.
- How severe is CVE-2026-115701?
- Informational severity, published 6 November 2026.
- Which products and versions are affected?
- Ninenines Cowboy 2.18.0 and later.
- Is there a fix for CVE-2026-115701?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-115701 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-115701?
- Check whether you run Ninenines Cowboy at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An unauth remote attacker can exhaust process memory by sending unlimited data on HTTP/1.1 keep-alive connections after the initial request is received but while the handler is still executing. The vulnerability exists because cowboy_http:parse/2 appends incoming bytes to the connection buffer without enforcing parser limits (max_request_line_length, max_headers) until the handler returns; only idle_timeout applies and resets on each received chunk. A few long-running requests can drive the Erlang VM into out-of-memory conditions.
Affected products
- ninenines cowboy 2.18.0 and later
Timeline
- 2026-11-06: disclosed