# CVE-2026-42764: openssl: Issue summary: Receiving a QUIC initial packet with an invalid token may trigger a NULL pointer dereference in the Op...

CVE-2026-42764 is fixed in 15 products on 1 platform, first by libssl3t64 3.5.5-1ubuntu3.2, released June 8, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-42764
- Priority: High
- CVSS: 9.1 (high)
- EPSS: 0.0117
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 8, 2026

## Description

Issue summary: Receiving a QUIC initial packet with an invalid token may trigger a NULL pointer dereference in the OpenSSL QUIC server with address validation disabled.  Impact summary: NULL pointer dereference typically causes abnormal termination of the affected QUIC server process and a Denial of Service.  If the address validation is disabled in the OpenSSL QUIC server implementation, an attacker can crash the server by sending an initial packet with an invalid or expired token.  By default, the client address validation is enabled in the OpenSSL QUIC server implementation, which makes the default configuration not vulnerable to this issue. However if the SSL_LISTENER_FLAG_NO_VALIDATE is used with the SSL_new_listener() call, the address validation is disabled making the vulnerable code reachable.  The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libssl3t64 Ubuntu 25.10 (questing) | 3.5.3-1ubuntu3.4 | [libssl3t64 3.5.3-1ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libssl3t64-3.5.3-1ubuntu3.4.md) | Jun 24, 2026 |
| Linux | libssl3t64 Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.2 | [libssl3t64 3.5.5-1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libssl3t64-3.5.5-1ubuntu3.2.md) | Jun 8, 2026 |
| Linux | nodejs24 sles 15.7 | 24.18.1-150700.15.18.1 | [SUSE-SU-2026:3835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3835-1.md) | Sep 10, 2026 |
| Linux | openssl Debian 13.5 (trixie) | 3.5.6-1~deb13u2 | [DEBIAN-CVE-2026-42764](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42764.md) | Jun 24, 2026 |
| Linux | openssl Debian 14 | 3.6.3-1 | [DEBIAN-CVE-2026-42764](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42764.md) | Jun 24, 2026 |
| Linux | openssl RHEL 10 | 3.5.5-4.el10_2 | [RHSA-2026:25237](https://patchblox.com/security/data/fix/linux/rhsa-2026-25237.md) | Jun 24, 2026 |
| Linux | openssl RHEL 9 | 1:3.5.5-4.el9_8 | [RHSA-2026:25239](https://patchblox.com/security/data/fix/linux/rhsa-2026-25239.md) | Jun 24, 2026 |
| Linux | openssl Ubuntu 25.10 (questing) | 3.5.3-1ubuntu3.4 | [openssl 3.5.3-1ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-openssl-3.5.3-1ubuntu3.4.md) | Jun 24, 2026 |
| Linux | openssl Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.2 | [openssl 3.5.5-1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openssl-3.5.5-1ubuntu3.2.md) | Jun 8, 2026 |
| Linux | openssl almalinux 10 | 1:3.5.5-4.el10_2.alma.1 | [ALSA-2026:25237](https://patchblox.com/security/data/fix/linux/alsa-2026-25237.md) | Jun 11, 2026 |
| Linux | openssl almalinux 9 | 1:3.5.5-4.el9_8 | [ALSA-2026:25239](https://patchblox.com/security/data/fix/linux/alsa-2026-25239.md) | Jun 11, 2026 |
| Linux | openssl amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl ol 10 | 1:3.5.5-5.0.1.el10_2 | [ELSA-2026-25237](https://patchblox.com/security/data/fix/linux/elsa-2026-25237.md) | Jul 28, 2026 |
| Linux | openssl ol 9 | 1:3.5.5-4.0.1.el9_8 | [ELSA-2026-25239](https://patchblox.com/security/data/fix/linux/elsa-2026-25239.md) | Jun 23, 2026 |
| Linux | openssl rocky 10 | 1:3.5.5-4.el10_2 | [RLSA-2026:25237](https://patchblox.com/security/data/fix/linux/rlsa-2026-25237.md) | Jun 13, 2026 |
| Linux | openssl rocky 9 | 1:3.5.5-4.el9_8 | [RLSA-2026:25239](https://patchblox.com/security/data/fix/linux/rlsa-2026-25239.md) | Jun 13, 2026 |
| Linux | openssl sles 15.7 | 3.5.0-150700.3.4.1 | [SUSE-SU-2026:3835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3835-1.md) | Sep 10, 2026 |
| Linux | openssl-3 opensuse-leap 16.0 | 3.5.0-160000.8.1 | [OPENSUSE-SU-2026:21005-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21005-1.md) | Jun 22, 2026 |
| Linux | openssl-3 sles 15.7 | 3.5.0-150700.5.45.2 | [SUSE-SU-2026:3835-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3835-1.md) | Sep 10, 2026 |
| Linux | openssl-3 sles 16.0 | 3.5.0-160000.8.1 | [SUSE-SU-2026:22315-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22315-1.md) | Jun 22, 2026 |
| Linux | openssl-debuginfo amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-debugsource amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-devel RHEL 9 | 1:3.5.5-4.el9_8 | [RHSA-2026:25239](https://patchblox.com/security/data/fix/linux/rhsa-2026-25239.md) | Jun 24, 2026 |
| Linux | openssl-devel almalinux 10 | 1:3.5.5-4.el10_2.alma.1 | [ALSA-2026:25237](https://patchblox.com/security/data/fix/linux/alsa-2026-25237.md) | Jun 11, 2026 |
| Linux | openssl-devel almalinux 9 | 1:3.5.5-4.el9_8 | [ALSA-2026:25239](https://patchblox.com/security/data/fix/linux/alsa-2026-25239.md) | Jun 11, 2026 |
| Linux | openssl-devel amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-devel ol 10 | 1:3.5.5-5.0.1.el10_2 | [ELSA-2026-25237](https://patchblox.com/security/data/fix/linux/elsa-2026-25237.md) | Jul 28, 2026 |
| Linux | openssl-devel ol 9 | 1:3.5.5-4.0.1.el9_8 | [ELSA-2026-25239](https://patchblox.com/security/data/fix/linux/elsa-2026-25239.md) | Jun 23, 2026 |
| Linux | openssl-fips-provider-latest amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-fips-provider-latest-debuginfo amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-libs RHEL 9 | 1:3.5.5-4.el9_8 | [RHSA-2026:25239](https://patchblox.com/security/data/fix/linux/rhsa-2026-25239.md) | Jun 24, 2026 |
| Linux | openssl-libs almalinux 10 | 1:3.5.5-4.el10_2.alma.1 | [ALSA-2026:25237](https://patchblox.com/security/data/fix/linux/alsa-2026-25237.md) | Jun 11, 2026 |
| Linux | openssl-libs almalinux 9 | 1:3.5.5-4.el9_8 | [ALSA-2026:25239](https://patchblox.com/security/data/fix/linux/alsa-2026-25239.md) | Jun 11, 2026 |
| Linux | openssl-libs amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-libs ol 10 | 1:3.5.5-5.0.1.el10_2 | [ELSA-2026-25237](https://patchblox.com/security/data/fix/linux/elsa-2026-25237.md) | Jul 28, 2026 |
| Linux | openssl-libs ol 9 | 1:3.5.5-4.0.1.el9_8 | [ELSA-2026-25239](https://patchblox.com/security/data/fix/linux/elsa-2026-25239.md) | Jun 23, 2026 |
| Linux | openssl-libs-debuginfo amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-perl RHEL 9 | 1:3.5.5-4.el9_8 | [RHSA-2026:25239](https://patchblox.com/security/data/fix/linux/rhsa-2026-25239.md) | Jun 24, 2026 |
| Linux | openssl-perl almalinux 10 | 1:3.5.5-4.el10_2.alma.1 | [ALSA-2026:25237](https://patchblox.com/security/data/fix/linux/alsa-2026-25237.md) | Jun 11, 2026 |
| Linux | openssl-perl almalinux 9 | 1:3.5.5-4.el9_8 | [ALSA-2026:25239](https://patchblox.com/security/data/fix/linux/alsa-2026-25239.md) | Jun 11, 2026 |
| Linux | openssl-perl amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-perl ol 10 | 1:3.5.5-5.0.1.el10_2 | [ELSA-2026-25237](https://patchblox.com/security/data/fix/linux/elsa-2026-25237.md) | Jul 28, 2026 |
| Linux | openssl-perl ol 9 | 1:3.5.5-4.0.1.el9_8 | [ELSA-2026-25239](https://patchblox.com/security/data/fix/linux/elsa-2026-25239.md) | Jun 23, 2026 |
| Linux | openssl-provider-legacy Ubuntu 25.10 (questing) | 3.5.3-1ubuntu3.4 | [openssl-provider-legacy 3.5.3-1ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-openssl-provider-legacy-3.5.3-1ubuntu3.4.md) | Jun 24, 2026 |
| Linux | openssl-provider-legacy Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.2 | [openssl-provider-legacy 3.5.5-1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openssl-provider-legacy-3.5.5-1ubuntu3.2.md) | Jun 8, 2026 |
| Linux | openssl-snapsafe-libs amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |
| Linux | openssl-snapsafe-libs-debuginfo amzn 2023 | 1:3.5.5-1.amzn2023.0.5 | [ALAS2023-2026-1853](https://patchblox.com/security/data/fix/linux/alas2023-2026-1853.md) | Jun 22, 2026 |

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