CVE-2026-105297

Summary Before version 0.8.1, Pingora's HTTP/2 server used the h2 crate's default limits unless the application set its own 16 MiB decoded header-list size and no limit on concurrent streams. A remote, unauthenticated client can send 1-byte HPACK references to a near-empty header, making the server allocate hundreds of thousands of header fields per stream across an unlimited number of streams on one connection, and use HTTP/2 flow control to keep those streams open. This can exhaust memory and degrade or terminate the Pingora process. Impact Remote, unauthenticated denial of service against any Pingora service that terminates HTTP/2 (h2 or h2c) without explicitly setting max_header_list_size and max_concurrent_streams. The reporter showed that a single connection could get a Pingora process with a 2 GiB memory limit OOM-killed. Note that Cloudflare CDN customers were unaffected, as internal Pingora services at Cloudflare do not have HTTP/2 clients. Mitigation: * Upgrade to pingora 0.8.1 or later (fix: https://github.com/cloudflare/pingora/commit/d193c8d49b8b7c1c1ede93183759caa4f6906bbd ). When no H2Options are supplied, Pingora now advertises and enforces a 64 KiB decoded header-list limit and at most 100 concurrent streams per connection. * Applications that supply their own H2Options are not covered by these defaults and must set max_header_list_size and max_concurrent_streams explicitly (this also works on versions before 0.8.1), or, on 0.8.1 and later, start from pingora_core::protocols::http::v2::server::default_h2_options(). H2Options::default() does not include these limits.

• CWE-770

• https://github.com/cloudflare/pingora

Published

Oct 20, 2026

Last Modified

Oct 20, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-105290A vulnerability was determined in feelec-yishu feelcrm-os 1.…7.3
• CVE-2026-105291A vulnerability was identified in feelec-yishu feelcrm-os 1.…4.3
• CVE-2026-105292Chaterm before 0.12.1 contains a login cross-site request fo…5.9
• CVE-2026-105293Legcord 1.1.0 through 1.3.0 contains a path traversal vulner…8.1
• CVE-2026-105294Legcord 1.1.0 through 1.3.0 contains a configuration injecti…7.4
• CVE-2026-105295GitAhead 2.5.0 through 2.7.1 contains an insecure update mec…7.5
• CVE-2026-105298Summary Before version 0.9.0, Pingora accepted HTTP/2 req…6.3
• CVE-2026-105299Summary Before version 0.9.0, the HTTP/1 upstream path in…8.7
• CVE-2026-1053The Ivory Search – WordPress Search Plugin plugin for WordPr…4.4
• CVE-2026-10530The Pie Register WordPress plugin before 3.8.4.10 does not …5.3
• CVE-2026-105301Rejected reason: This candidate was rejected after further i…
• CVE-2026-105302A flaw was found in the User Session Note mapper of the Keyc…5.7