CVE-2026-47736
Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer while waiting for CRLF to determine whether a PROXY v1 line is present, allowing an attacker that continuously sends bytes without CRLF to cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer. This issue is fixed in versions 7.2.1 and 8.0.2.
- Affected products
- Puma
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.3% (27th percentile)
- Weakness
- CWE-400
- NVD status
- Deferred
- Published
- 2026-07-14
CVE-2026-47736 at NVD
No indexed exploits for CVE-2026-47736 yet
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No exploit for CVE-2026-47736 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.