An mvfst QUIC server retained CRYPTO frame data received at an encryption level (Initial or Handshake) that the TLS handshake had already moved past. Because the transport treated this data as delivered, it did not count against the CRYPTO stream buffer limit. A remote, unauthenticated client could complete a handshake, withhold its acknowledgment of the server's HANDSHAKE_DONE frame so that Handshake keys stay in use, and keep sending Handshake-level CRYPTO data at increasing offsets, causing unbounded memory growth on the server and leading to denial of service. This issue affects mvfst versions prior to v2026.11.09.00.
Metrics
Affected Vendors & Products
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Advisories
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Fixes
Solution
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Workaround
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References
History
Wed, 11 Nov 2026 17:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | An mvfst QUIC server retained CRYPTO frame data received at an encryption level (Initial or Handshake) that the TLS handshake had already moved past. Because the transport treated this data as delivered, it did not count against the CRYPTO stream buffer limit. A remote, unauthenticated client could complete a handshake, withhold its acknowledgment of the server's HANDSHAKE_DONE frame so that Handshake keys stay in use, and keep sending Handshake-level CRYPTO data at increasing offsets, causing unbounded memory growth on the server and leading to denial of service. This issue affects mvfst versions prior to v2026.11.09.00. | |
| References |
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MITRE
Status: PUBLISHED
Assigner: Meta
Published:
Updated: 2026-11-11T16:55:09.288Z
Reserved: 2026-10-29T17:01:32.523Z
Link: CVE-2026-119236
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-11-11T17:17:16.800
Modified: 2026-11-11T17:17:16.800
Link: CVE-2026-119236
Redhat
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OpenCVE Enrichment
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Weaknesses
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