# CVE-2026-14456: Unbounded Memory Growth in QUIC Server Incoming Channel Queue CVE-2026-14456 is fixed in 14 products on 1 platform, first by libssl3t64 3.5.5-1ubuntu3.4, released August 24, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-14456 - Priority: High - CVSS: 7.5 (Important) - EPSS: 0.0073 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 13, 2026 - Weakness: Allocation of Resources Without Limits or Throttling - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-14456 ## Description Issue summary: When an OpenSSL QUIC server (Listener SSL object) processes valid QUIC Initial packets for unknown destination connection IDs, it can allocate and queue new incoming channels without enforcing any limit. Impact summary: A remote peer that can make many Initial packets reach the server listener faster than the application accepts connections, can cause the memory allocated to store the per-channel state to grow without any limits, potentially making the QUIC listener unavailable and causing Denial of Service. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: The function that handles inbound QUIC packets uses Connection-Id from the packet header to find an existing connection (QUIC channel). If no existing connection is found and the packet type is INITIAL, the function treats the packet as a new connection. It allocates a new channel object and inserts it into a queue where it waits to be accepted by the local application with SSL_accept(3ossl). The memory occupied by these initial channel objects may grow without bounds if the application is not able to call SSL_accept() frequently enough to serve these inbound connection requests. The issue is present since OpenSSL 3.5 when the QUIC server implementation was added. The fix introduces a limit for pending connections. The default limit is set to 256 pending connections (waiting to be accepted by the local application). Applications may change the default by calling SSL_set_value_uint(3ossl). FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libssl3t64 Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.4 | [libssl3t64 3.5.5-1ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libssl3t64-3.5.5-1ubuntu3.4.md) | Aug 24, 2026 | | Linux | openssl Debian 13.5 (trixie) | 3.5.7-1~deb13u2 | [DEBIAN-CVE-2026-14456](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14456.md) | Aug 27, 2026 | | Linux | openssl Debian 14 | 3.6.4-1 | [DEBIAN-CVE-2026-14456](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14456.md) | Aug 27, 2026 | | Linux | openssl RHEL 10 | 3.5.8-1.el10_2 | [RHSA-2026:67154](https://patchblox.com/security/data/fix/linux/rhsa-2026-67154.md) | Sep 14, 2026 | | Linux | openssl RHEL 9 | 1:3.5.8-1.el9_8 | [RHSA-2026:67165](https://patchblox.com/security/data/fix/linux/rhsa-2026-67165.md) | Sep 19, 2026 | | Linux | openssl Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.4 | [openssl 3.5.5-1ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openssl-3.5.5-1ubuntu3.4.md) | Aug 24, 2026 | | Linux | openssl almalinux 10 | 1:3.5.8-1.el10_2.alma.1 | [ALSA-2026:67154](https://patchblox.com/security/data/fix/linux/alsa-2026-67154.md) | Sep 14, 2026 | | Linux | openssl almalinux 9 | 1:3.5.8-1.el9_8 | [ALSA-2026:67165](https://patchblox.com/security/data/fix/linux/alsa-2026-67165.md) | Sep 14, 2026 | | Linux | openssl amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl ol 10 | 1:3.5.8-1.0.1.el10_2 | [ELSA-2026-67154-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67154-0.md) | Sep 14, 2026 | | Linux | openssl ol 9 | 1:3.5.8-1.0.1.el9_8 | [ELSA-2026-67165-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67165-0.md) | Sep 14, 2026 | | Linux | openssl rocky 10 | 1:3.5.8-1.el10_2 | [RLSA-2026:67154](https://patchblox.com/security/data/fix/linux/rlsa-2026-67154.md) | Sep 15, 2026 | | Linux | openssl rocky 9 | 1:3.5.8-1.el9_8 | [RLSA-2026:67165](https://patchblox.com/security/data/fix/linux/rlsa-2026-67165.md) | Sep 15, 2026 | | Linux | openssl-3 opensuse-leap 16.0 | 3.5.0-160000.10.1 | [OPENSUSE-SU-2026:21744-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21744-1.md) | Sep 2, 2026 | | Linux | openssl-3 sles 15.7 | 3.5.0-150700.5.50.1 | [SUSE-SU-2026:4039-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4039-1.md) | Sep 7, 2026 | | Linux | openssl-3 sles 16.0 | 3.5.0-160000.10.1 | [SUSE-SU-2026:23609-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23609-1.md) | Sep 2, 2026 | | Linux | openssl-debuginfo amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-debugsource amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-devel RHEL 9 | 1:3.5.8-1.el9_8 | [RHSA-2026:67165](https://patchblox.com/security/data/fix/linux/rhsa-2026-67165.md) | Sep 19, 2026 | | Linux | openssl-devel almalinux 10 | 1:3.5.8-1.el10_2.alma.1 | [ALSA-2026:67154](https://patchblox.com/security/data/fix/linux/alsa-2026-67154.md) | Sep 14, 2026 | | Linux | openssl-devel almalinux 9 | 1:3.5.8-1.el9_8 | [ALSA-2026:67165](https://patchblox.com/security/data/fix/linux/alsa-2026-67165.md) | Sep 14, 2026 | | Linux | openssl-devel amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-devel ol 10 | 1:3.5.8-1.0.1.el10_2 | [ELSA-2026-67154-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67154-0.md) | Sep 14, 2026 | | Linux | openssl-devel ol 9 | 1:3.5.8-1.0.1.el9_8 | [ELSA-2026-67165-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67165-0.md) | Sep 14, 2026 | | Linux | openssl-fips-provider-latest amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-fips-provider-latest-debuginfo amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-libs RHEL 9 | 1:3.5.8-1.el9_8 | [RHSA-2026:67165](https://patchblox.com/security/data/fix/linux/rhsa-2026-67165.md) | Sep 19, 2026 | | Linux | openssl-libs almalinux 10 | 1:3.5.8-1.el10_2.alma.1 | [ALSA-2026:67154](https://patchblox.com/security/data/fix/linux/alsa-2026-67154.md) | Sep 14, 2026 | | Linux | openssl-libs almalinux 9 | 1:3.5.8-1.el9_8 | [ALSA-2026:67165](https://patchblox.com/security/data/fix/linux/alsa-2026-67165.md) | Sep 14, 2026 | | Linux | openssl-libs amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-libs ol 10 | 1:3.5.8-1.0.1.el10_2 | [ELSA-2026-67154-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67154-0.md) | Sep 14, 2026 | | Linux | openssl-libs ol 9 | 1:3.5.8-1.0.1.el9_8 | [ELSA-2026-67165-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67165-0.md) | Sep 14, 2026 | | Linux | openssl-libs-debuginfo amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-perl RHEL 9 | 1:3.5.8-1.el9_8 | [RHSA-2026:67165](https://patchblox.com/security/data/fix/linux/rhsa-2026-67165.md) | Sep 19, 2026 | | Linux | openssl-perl almalinux 10 | 1:3.5.8-1.el10_2.alma.1 | [ALSA-2026:67154](https://patchblox.com/security/data/fix/linux/alsa-2026-67154.md) | Sep 14, 2026 | | Linux | openssl-perl almalinux 9 | 1:3.5.8-1.el9_8 | [ALSA-2026:67165](https://patchblox.com/security/data/fix/linux/alsa-2026-67165.md) | Sep 14, 2026 | | Linux | openssl-perl amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-perl ol 10 | 1:3.5.8-1.0.1.el10_2 | [ELSA-2026-67154-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67154-0.md) | Sep 14, 2026 | | Linux | openssl-perl ol 9 | 1:3.5.8-1.0.1.el9_8 | [ELSA-2026-67165-0](https://patchblox.com/security/data/fix/linux/elsa-2026-67165-0.md) | Sep 14, 2026 | | Linux | openssl-provider-legacy Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.4 | [openssl-provider-legacy 3.5.5-1ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openssl-provider-legacy-3.5.5-1ubuntu3.4.md) | Aug 24, 2026 | | Linux | openssl-snapsafe-libs amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | | Linux | openssl-snapsafe-libs-debuginfo amzn 2023 | 1:3.5.7-2.amzn2023.0.2 | [ALAS2023-2026-2088](https://patchblox.com/security/data/fix/linux/alas2023-2026-2088.md) | Aug 31, 2026 | --- Data as of 2026-11-09T07:25:28Z UTC. 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