# CVE-2026-45447: Heap Use-After-Free in the PKCS7_verify() Function

CVE-2026-45447 is fixed in 25 products on 1 platform, first by RHSA-2026:71542, released March 12, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-45447
- Priority: High
- CVSS: 9.1 (Important)
- EPSS: 0.0400
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 8, 2026
- Weakness: Use After Free
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45447

## Description

The OpenSSL toolkit provides support for secure communications between machines. This version of OpenSSL package contains only the libraries from the 1.1.1 version and is provided for compatibility with previous releases.  Security Fix(es):  * openssl: Heap Use-After-Free in OpenSSL PKCS7_verify() (CVE-2026-45447)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | compat-openssl10 RHEL 8 | 1:1.0.2o-4.el8_10.3 | [RHSA-2026:36215](https://patchblox.com/security/data/fix/linux/rhsa-2026-36215.md) | Jul 8, 2026 |
| Linux | compat-openssl10 almalinux 8 | 1:1.0.2o-4.el8_10.3 | [ALSA-2026:36215](https://patchblox.com/security/data/fix/linux/alsa-2026-36215.md) | Jul 7, 2026 |
| Linux | compat-openssl10 ol 8 | 1:1.0.2o-4.el8_10.3 | [ELSA-2026-36215](https://patchblox.com/security/data/fix/linux/elsa-2026-36215.md) | Jul 7, 2026 |
| Linux | compat-openssl10 rocky 8 | 1:1.0.2o-4.el8_10.3 | [RLSA-2026:36215](https://patchblox.com/security/data/fix/linux/rlsa-2026-36215.md) | Jul 13, 2026 |
| Linux | compat-openssl11 RHEL 9 | 1:1.1.1k-5.el9_8.4 | [RHSA-2026:44438](https://patchblox.com/security/data/fix/linux/rhsa-2026-44438.md) | Jul 24, 2026 |
| Linux | compat-openssl11 almalinux 9 | 1:1.1.1k-5.el9_8.4 | [ALSA-2026:44438](https://patchblox.com/security/data/fix/linux/alsa-2026-44438.md) | Jul 23, 2026 |
| Linux | compat-openssl11 ol 9 | 1:1.1.1k-5.el9_8.4 | [ELSA-2026-44438](https://patchblox.com/security/data/fix/linux/elsa-2026-44438.md) | Jul 23, 2026 |
| Linux | compat-openssl11 rocky 9 | 1:1.1.1k-5.el9_8.4 | [RLSA-2026:44438](https://patchblox.com/security/data/fix/linux/rlsa-2026-44438.md) | Jul 27, 2026 |
| Linux | libssl1.0.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.13+esm5 | [libssl1.0.0 1.0.2n-1ubuntu5.13+esm5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.13-esm5.md) | Jun 24, 2026 |
| Linux | libssl1.1 Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.23+esm9 | [libssl1.1 1.1.1-1ubuntu2.1~18.04.23+esm9](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.1-1.1.1-1ubuntu2.1-18.04.23-esm9.md) | Jun 24, 2026 |
| Linux | libssl1.1 Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.24+esm4 | [libssl1.1 1.1.1f-1ubuntu2.24+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libssl1.1-1.1.1f-1ubuntu2.24-esm4.md) | Jun 24, 2026 |
| Linux | libssl3 Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.25 | [libssl3 3.0.2-0ubuntu1.25](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libssl3-3.0.2-0ubuntu1.25.md) | Jun 24, 2026 |
| Linux | libssl3t64 Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.11 | [libssl3t64 3.0.13-0ubuntu3.11](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libssl3t64-3.0.13-0ubuntu3.11.md) | Jun 24, 2026 |
| 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 | openssl Debian 12.15 (bookworm) | 3.0.20-1~deb12u2 | [DEBIAN-CVE-2026-45447](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45447.md) | Jun 24, 2026 |
| Linux | openssl Debian 13.5 (trixie) | 3.5.6-1~deb13u2 | [DEBIAN-CVE-2026-45447](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45447.md) | Jun 24, 2026 |
| Linux | openssl Debian 14 | 3.6.3-1 | [DEBIAN-CVE-2026-45447](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45447.md) | Jun 24, 2026 |
| Linux | openssl RHEL 10 | 3.2.2-16.el10_0.7 | [RHSA-2026:71542](https://patchblox.com/security/data/fix/linux/rhsa-2026-71542.md) | Mar 12, 2026 |
| Linux | openssl RHEL 8 | 1:1.1.1k-16.el8_6 | [RHSA-2026:26275](https://patchblox.com/security/data/fix/linux/rhsa-2026-26275.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 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.23+esm9 | [openssl 1.1.1-1ubuntu2.1~18.04.23+esm9](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl-1.1.1-1ubuntu2.1-18.04.23-esm9.md) | Jun 24, 2026 |
| Linux | openssl Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.24+esm4 | [openssl 1.1.1f-1ubuntu2.24+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-openssl-1.1.1f-1ubuntu2.24-esm4.md) | Jun 24, 2026 |
| Linux | openssl Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.25 | [openssl 3.0.2-0ubuntu1.25](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-openssl-3.0.2-0ubuntu1.25.md) | Jun 24, 2026 |
| Linux | openssl Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.11 | [openssl 3.0.13-0ubuntu3.11](https://patchblox.com/security/data/fix/linux/ubuntu-noble-openssl-3.0.13-0ubuntu3.11.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 8 | 1:1.1.1k-16.el8_6 | [ALSA-2026:26275](https://patchblox.com/security/data/fix/linux/alsa-2026-26275.md) | Jun 16, 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 8 | 1:1.1.1k-16.el8_6 | [ELSA-2026-26275](https://patchblox.com/security/data/fix/linux/elsa-2026-26275.md) | Jun 16, 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 8 | 1:1.1.1k-16.el8_10 | [RLSA-2026:26275](https://patchblox.com/security/data/fix/linux/rlsa-2026-26275.md) | Jun 17, 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-1_0_0 sles 15.6 | 1.0.2p-150000.3.108.1 | [SUSE-SU-2026:2399-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2399-1.md) | Jun 15, 2026 |
| Linux | openssl-1_0_0 sles 15.7 | 1.0.2p-150000.3.108.1 | [SUSE-SU-2026:2399-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2399-1.md) | Jun 15, 2026 |
| Linux | openssl-1_1 sles 15.6 | 1.1.1w-150600.5.32.1 | [SUSE-SU-2026:2404-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2404-1.md) | Jun 16, 2026 |
| Linux | openssl-1_1 sles 15.7 | 1.1.1w-150700.11.22.1 | [SUSE-SU-2026:2392-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2392-1.md) | Jun 15, 2026 |
| Linux | openssl-1_1-livepatches sles 15.6 | 0.6-150600.11.6.1 | [SUSE-SU-2026:2410-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2410-1.md) | Jun 16, 2026 |
| Linux | openssl-1_1-livepatches sles 15.7 | 0.6-150700.13.6.1 | [SUSE-SU-2026:2412-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2412-1.md) | Jun 16, 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 15.6 | 3.1.4-150600.5.53.1 | [SUSE-SU-2026:2393-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2393-1.md) | Jun 15, 2026 |
| Linux | openssl-3 sles 15.7 | 3.2.3-150700.5.36.1 | [SUSE-SU-2026:2648-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2648-1.md) | Jun 26, 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-3-livepatches sles 15.6 | 0.4-150600.13.11.1 | [SUSE-SU-2026:2411-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2411-1.md) | Jun 16, 2026 |
| Linux | openssl-3-livepatches sles 15.7 | 0.4-150700.16.6.1 | [SUSE-SU-2026:2662-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2662-1.md) | Jun 26, 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 8 | 1:1.1.1k-16.el8_6 | [RHSA-2026:26275](https://patchblox.com/security/data/fix/linux/rhsa-2026-26275.md) | Jun 24, 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 8 | 1:1.1.1k-16.el8_6 | [ALSA-2026:26275](https://patchblox.com/security/data/fix/linux/alsa-2026-26275.md) | Jun 16, 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 8 | 1:1.1.1k-16.el8_6 | [ELSA-2026-26275](https://patchblox.com/security/data/fix/linux/elsa-2026-26275.md) | Jun 16, 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 8 | 1:1.1.1k-16.el8_6 | [RHSA-2026:26275](https://patchblox.com/security/data/fix/linux/rhsa-2026-26275.md) | Jun 24, 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 8 | 1:1.1.1k-16.el8_6 | [ALSA-2026:26275](https://patchblox.com/security/data/fix/linux/alsa-2026-26275.md) | Jun 16, 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 8 | 1:1.1.1k-16.el8_6 | [ELSA-2026-26275](https://patchblox.com/security/data/fix/linux/elsa-2026-26275.md) | Jun 16, 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 8 | 1:1.1.1k-16.el8_6 | [RHSA-2026:26275](https://patchblox.com/security/data/fix/linux/rhsa-2026-26275.md) | Jun 24, 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 8 | 1:1.1.1k-16.el8_6 | [ALSA-2026:26275](https://patchblox.com/security/data/fix/linux/alsa-2026-26275.md) | Jun 16, 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 8 | 1:1.1.1k-16.el8_6 | [ELSA-2026-26275](https://patchblox.com/security/data/fix/linux/elsa-2026-26275.md) | Jun 16, 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 |
| Linux | openssl-static ol 8 | 2:1.1.1k-16.ksplice1.el8_6 | [ELSA-2026-50323](https://patchblox.com/security/data/fix/linux/elsa-2026-50323.md) | Jun 18, 2026 |
| Linux | openssl1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.13+esm5 | [openssl1.0 1.0.2n-1ubuntu5.13+esm5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl1.0-1.0.2n-1ubuntu5.13-esm5.md) | Jun 24, 2026 |

---

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