Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data.
Impact summary: A remote QUIC peer that completes the handshake can create a connection-scoped CPU pressure and potentially a Denial of Service using compliant STREAM frames inside the advertised receive window, with low attacker bandwidth.
CWE: CWE-407: Inefficient Algorithmic Complexity
Description: OpenSSL manages received QUIC stream fragments using a doubly-linked list. While it optimizes for append operations (at the end of the list), it falls back to a head-to-tail linear search for any fragment that does not immediately follow the current `tail`.
By manipulating the sequence of offsets, an attacker can force the server to perform O(n^2) operations, consuming excessive CPU time for the QUIC process.
FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade openssl-develUpgrade openssl-libsUpgrade openssl-snapsafe-libsUpgrade openssl-fips-provider-latest-debuginfoUpgrade openssl-perlUpgrade openssl-fips-provider-latestUpgrade openssl-snapsafe-libs-debuginfoUpgrade openssl-debuginfoUpgrade opensslUpgrade openssl-debugsourceUpgrade openssl-libs-debuginfo | Oct 13, 2026 | Sep 29, 2026 |
| Debian | — | Upgrade openssl | Oct 1, 2026 | Sep 29, 2026 |
| Freebsd | — | Upgrade openssl40Upgrade opensslUpgrade openssl30Upgrade openssl34Upgrade openssl36Upgrade FreeBSD | Oct 5, 2026 | Sep 30, 2026 |
| Http Openssl | — | Upgrade to the latest version of OpenSSL | Sep 30, 2026 | Sep 29, 2026 |
| Redhat_linux | — | No solution exists | Oct 1, 2026 | Sep 29, 2026 |
| Ubuntu | — | Upgrade libssl3t64 | Oct 6, 2026 | Oct 1, 2026 |
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