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CVE-2026-105297

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cve id
CVE-2026-105297
published
2026-10-20T01:17:09.613
last modified
2026-10-20T01:17:09.613
status
Received
description
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
cvss score
7.5
cvss severity
HIGH
cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cwes
CWE-770
cpe count
0
Verify at NIST National Vulnerability Database ↗
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Cite this record

CVE-2026-105297 — HIGH. NIST, via Voidly Atlas — Surveillance & Digital-Rights Watch. Retrieved 2026-10-20, https://voidly.ai/atlas/federal/nvd-cves/CVE-2026-105297

@misc{voidly_nvd_cves_CVE2026105297,
  title        = {CVE-2026-105297 — HIGH},
  author       = {{Voidly}},
  howpublished = {\url{https://voidly.ai/atlas/federal/nvd-cves/CVE-2026-105297}},
  note         = {Source: NIST National Vulnerability Database, https://nvd.nist.gov/vuln/detail/CVE-2026-105297. Public domain (17 U.S.C. §105); re-surfaced under CC BY 4.0},
  urldate      = {2026-10-20},
  year         = {2026}
}

Also available as JSON/BibTeX/APA: API record. Source data is U.S. federal public domain (17 U.S.C. §105). Re-surfaced by Voidly under CC BY 4.0.