Bug 2500583 (CVE-2026-47736) - CVE-2026-47736 puma: Puma: Denial of Service due to unbounded memory growth in PROXY protocol v1
Summary: CVE-2026-47736 puma: Puma: Denial of Service due to unbounded memory growth i...
Keywords:
Status: NEW
Alias: CVE-2026-47736
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2500848
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-14 20:04 UTC by OSIDB Bzimport
Modified: 2026-07-15 10:14 UTC (History)
24 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-14 20:04:41 UTC 
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.
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