# CVE-2026-84782: DTLS Retransmits Handshake Messages From a Stale Buffer Offset

CVE-2026-84782 is fixed in 26 products on 1 platform, first by libssl3t64 3.5.5-1ubuntu3.6, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-84782
- Priority: High
- CVSS: 8.2 (Important)
- EPSS: 0.0083
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 28, 2026
- Weakness: Out-of-bounds Read
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84782

## Description

The OpenSSL toolkit provides support for secure communications between machines. This version of OpenSSL package contains only the libraries and is provided for compatibility with previous releases and software that does not support compilation with OpenSSL-1.1.  Security Fix(es):  * openssl: compat-openssl: DTLS Retransmits Handshake Messages From a Stale Buffer Offset (CVE-2026-84782)  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_10.4 | [RHSA-2026:80510](https://patchblox.com/security/data/fix/linux/rhsa-2026-80510.md) | Oct 12, 2026 |
| Linux | compat-openssl10 almalinux 8 | 1:1.0.2o-4.el8_10.4 | [ALSA-2026:80510](https://patchblox.com/security/data/fix/linux/alsa-2026-80510.md) | Nov 7, 2026 |
| Linux | compat-openssl10 ol 8 | 1:1.0.2o-4.el8_10.4 | [ELSA-2026-80510](https://patchblox.com/security/data/fix/linux/elsa-2026-80510.md) | Nov 7, 2026 |
| Linux | compat-openssl10 rocky 8 | 1:1.0.2o-4.el8_10.4 | [RLSA-2026:80510](https://patchblox.com/security/data/fix/linux/rlsa-2026-80510.md) | Nov 7, 2026 |
| Linux | compat-openssl11 RHEL 9 | 1:1.1.1k-5.el9_8.6 | [RHSA-2026:80514](https://patchblox.com/security/data/fix/linux/rhsa-2026-80514.md) | Oct 12, 2026 |
| Linux | compat-openssl11 almalinux 9 | 1:1.1.1k-5.el9_8.6 | [ALSA-2026:80514](https://patchblox.com/security/data/fix/linux/alsa-2026-80514.md) | Nov 7, 2026 |
| Linux | compat-openssl11 ol 9 | 1:1.1.1k-5.el9_8.6 | [ELSA-2026-80514](https://patchblox.com/security/data/fix/linux/elsa-2026-80514.md) | Nov 7, 2026 |
| Linux | compat-openssl11 rocky 9 | 1:1.1.1k-5.el9_8.6 | [RLSA-2026:80514](https://patchblox.com/security/data/fix/linux/rlsa-2026-80514.md) | Nov 7, 2026 |
| Linux | edk2-aarch64 amzn 2023 | 20260508-2.amzn2023 | [ALAS2023-2026-3227](https://patchblox.com/security/data/fix/linux/alas2023-2026-3227.md) | Nov 7, 2026 |
| Linux | edk2-ovmf amzn 2023 | 20260508-2.amzn2023 | [ALAS2023-2026-3227](https://patchblox.com/security/data/fix/linux/alas2023-2026-3227.md) | Nov 7, 2026 |
| Linux | edk2-shell-aa64 amzn 2023 | 20260508-2.amzn2023 | [ALAS2023-2026-3227](https://patchblox.com/security/data/fix/linux/alas2023-2026-3227.md) | Nov 7, 2026 |
| Linux | edk2-shell-x64 amzn 2023 | 20260508-2.amzn2023 | [ALAS2023-2026-3227](https://patchblox.com/security/data/fix/linux/alas2023-2026-3227.md) | Nov 7, 2026 |
| Linux | libssl1.0.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.13+esm7 | [libssl1.0.0 1.0.2n-1ubuntu5.13+esm7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.13-esm7.md) | Oct 1, 2026 |
| Linux | libssl1.1 Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.23+esm11 | [libssl1.1 1.1.1-1ubuntu2.1~18.04.23+esm11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.1-1.1.1-1ubuntu2.1-18.04.23-esm11.md) | Oct 1, 2026 |
| Linux | libssl1.1 Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.24+esm6 | [libssl1.1 1.1.1f-1ubuntu2.24+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libssl1.1-1.1.1f-1ubuntu2.24-esm6.md) | Oct 1, 2026 |
| Linux | libssl3 Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.30 | [libssl3 3.0.2-0ubuntu1.30](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libssl3-3.0.2-0ubuntu1.30.md) | Sep 30, 2026 |
| Linux | libssl3t64 Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.16 | [libssl3t64 3.0.13-0ubuntu3.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libssl3t64-3.0.13-0ubuntu3.16.md) | Sep 30, 2026 |
| Linux | libssl3t64 Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.6 | [libssl3t64 3.5.5-1ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libssl3t64-3.5.5-1ubuntu3.6.md) | Sep 28, 2026 |
| Linux | openssl Debian 12.15 (bookworm) | 3.0.22-1~deb12u2 | [DEBIAN-CVE-2026-84782](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84782.md) | Sep 30, 2026 |
| Linux | openssl Debian 13.5 (trixie) | 3.5.7-1~deb13u3 | [DEBIAN-CVE-2026-84782](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84782.md) | Sep 30, 2026 |
| Linux | openssl Debian 14 | 3.6.5-1 | [DEBIAN-CVE-2026-84782](https://patchblox.com/security/data/fix/linux/debian-cve-2026-84782.md) | Sep 30, 2026 |
| Linux | openssl RHEL 10 | 3.5.8-2.el10_2 | [RHSA-2026:76918](https://patchblox.com/security/data/fix/linux/rhsa-2026-76918.md) | Oct 9, 2026 |
| Linux | openssl RHEL 8 | 1:1.1.1k-18.el8_6 | [RHSA-2026:85968](https://patchblox.com/security/data/fix/linux/rhsa-2026-85968.md) | Oct 21, 2026 |
| Linux | openssl RHEL 9 | 1:3.5.8-2.el9_8 | [RHSA-2026:77396](https://patchblox.com/security/data/fix/linux/rhsa-2026-77396.md) | Oct 9, 2026 |
| Linux | openssl Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.23+esm11 | [openssl 1.1.1-1ubuntu2.1~18.04.23+esm11](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl-1.1.1-1ubuntu2.1-18.04.23-esm11.md) | Oct 1, 2026 |
| Linux | openssl Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.24+esm6 | [openssl 1.1.1f-1ubuntu2.24+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-openssl-1.1.1f-1ubuntu2.24-esm6.md) | Oct 1, 2026 |
| Linux | openssl Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.30 | [openssl 3.0.2-0ubuntu1.30](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-openssl-3.0.2-0ubuntu1.30.md) | Sep 30, 2026 |
| Linux | openssl Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.16 | [openssl 3.0.13-0ubuntu3.16](https://patchblox.com/security/data/fix/linux/ubuntu-noble-openssl-3.0.13-0ubuntu3.16.md) | Sep 30, 2026 |
| Linux | openssl Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.6 | [openssl 3.5.5-1ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openssl-3.5.5-1ubuntu3.6.md) | Sep 28, 2026 |
| Linux | openssl almalinux 10 | 1:3.5.8-2.el10_2.alma.1 | [ALSA-2026:76918](https://patchblox.com/security/data/fix/linux/alsa-2026-76918.md) | Oct 6, 2026 |
| Linux | openssl almalinux 8 | 1:1.1.1k-18.el8_6 | [ALSA-2026:85968](https://patchblox.com/security/data/fix/linux/alsa-2026-85968.md) | Nov 7, 2026 |
| Linux | openssl almalinux 9 | 1:3.5.8-2.el9_8 | [ALSA-2026:77396](https://patchblox.com/security/data/fix/linux/alsa-2026-77396.md) | Oct 7, 2026 |
| Linux | openssl amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl ol 10 | 1:3.5.8-2.0.1.el10_2 | [ELSA-2026-76918](https://patchblox.com/security/data/fix/linux/elsa-2026-76918.md) | Oct 8, 2026 |
| Linux | openssl ol 8 | 1:1.1.1k-18.el8_6 | [ELSA-2026-85968](https://patchblox.com/security/data/fix/linux/elsa-2026-85968.md) | Nov 7, 2026 |
| Linux | openssl ol 9 | 1:3.5.8-2.0.1.el9_8 | [ELSA-2026-77396](https://patchblox.com/security/data/fix/linux/elsa-2026-77396.md) | Oct 8, 2026 |
| Linux | openssl rocky 10 | 1:3.5.8-2.el10_2 | [RLSA-2026:76918](https://patchblox.com/security/data/fix/linux/rlsa-2026-76918.md) | Nov 7, 2026 |
| Linux | openssl rocky 9 | 1:3.5.8-2.el9_8 | [RLSA-2026:77396](https://patchblox.com/security/data/fix/linux/rlsa-2026-77396.md) | Nov 7, 2026 |
| Linux | openssl-3 opensuse-leap 16.0 | 3.5.0-160000.11.1 | [OPENSUSE-SU-2026:22102-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22102-1.md) | Nov 7, 2026 |
| Linux | openssl-3 sles 15.6 | 3.1.4-150600.5.67.1 | [SUSE-SU-2026:4419-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4419-1.md) | Oct 2, 2026 |
| Linux | openssl-3 sles 15.7 | 3.5.0-150700.5.53.2 | [SUSE-SU-2026:4414-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4414-1.md) | Oct 2, 2026 |
| Linux | openssl-3 sles 16.0 | 3.5.0-160000.11.1 | [SUSE-SU-2026:24245-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24245-1.md) | Nov 7, 2026 |
| Linux | openssl-3-livepatches sles 15.6 | 0.7-150600.13.22.1 | [SUSE-SU-2026:4418-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4418-1.md) | Oct 2, 2026 |
| Linux | openssl-3-livepatches sles 15.7 | 0.7-150700.16.15.1 | [SUSE-SU-2026:4560-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4560-1.md) | Oct 7, 2026 |
| Linux | openssl-debuginfo amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-debugsource amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-devel RHEL 8 | 1:1.1.1k-18.el8_6 | [RHSA-2026:85968](https://patchblox.com/security/data/fix/linux/rhsa-2026-85968.md) | Oct 21, 2026 |
| Linux | openssl-devel RHEL 9 | 1:3.5.8-2.el9_8 | [RHSA-2026:77396](https://patchblox.com/security/data/fix/linux/rhsa-2026-77396.md) | Oct 9, 2026 |
| Linux | openssl-devel almalinux 10 | 1:3.5.8-2.el10_2.alma.1 | [ALSA-2026:76918](https://patchblox.com/security/data/fix/linux/alsa-2026-76918.md) | Oct 6, 2026 |
| Linux | openssl-devel almalinux 8 | 1:1.1.1k-18.el8_6 | [ALSA-2026:85968](https://patchblox.com/security/data/fix/linux/alsa-2026-85968.md) | Nov 7, 2026 |
| Linux | openssl-devel almalinux 9 | 1:3.5.8-2.el9_8 | [ALSA-2026:77396](https://patchblox.com/security/data/fix/linux/alsa-2026-77396.md) | Oct 7, 2026 |
| Linux | openssl-devel amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-devel ol 10 | 1:3.5.8-2.0.1.el10_2 | [ELSA-2026-76918](https://patchblox.com/security/data/fix/linux/elsa-2026-76918.md) | Oct 8, 2026 |
| Linux | openssl-devel ol 8 | 1:1.1.1k-18.el8_6 | [ELSA-2026-85968](https://patchblox.com/security/data/fix/linux/elsa-2026-85968.md) | Nov 7, 2026 |
| Linux | openssl-devel ol 9 | 1:3.5.8-2.0.1.el9_8 | [ELSA-2026-77396](https://patchblox.com/security/data/fix/linux/elsa-2026-77396.md) | Oct 8, 2026 |
| Linux | openssl-fips-provider-latest amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-fips-provider-latest-debuginfo amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-libs RHEL 8 | 1:1.1.1k-18.el8_6 | [RHSA-2026:85968](https://patchblox.com/security/data/fix/linux/rhsa-2026-85968.md) | Oct 21, 2026 |
| Linux | openssl-libs RHEL 9 | 1:3.5.8-2.el9_8 | [RHSA-2026:77396](https://patchblox.com/security/data/fix/linux/rhsa-2026-77396.md) | Oct 9, 2026 |
| Linux | openssl-libs almalinux 10 | 1:3.5.8-2.el10_2.alma.1 | [ALSA-2026:76918](https://patchblox.com/security/data/fix/linux/alsa-2026-76918.md) | Oct 6, 2026 |
| Linux | openssl-libs almalinux 8 | 1:1.1.1k-18.el8_6 | [ALSA-2026:85968](https://patchblox.com/security/data/fix/linux/alsa-2026-85968.md) | Nov 7, 2026 |
| Linux | openssl-libs almalinux 9 | 1:3.5.8-2.el9_8 | [ALSA-2026:77396](https://patchblox.com/security/data/fix/linux/alsa-2026-77396.md) | Oct 7, 2026 |
| Linux | openssl-libs amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-libs ol 10 | 1:3.5.8-2.0.1.el10_2 | [ELSA-2026-76918](https://patchblox.com/security/data/fix/linux/elsa-2026-76918.md) | Oct 8, 2026 |
| Linux | openssl-libs ol 8 | 1:1.1.1k-18.el8_6 | [ELSA-2026-85968](https://patchblox.com/security/data/fix/linux/elsa-2026-85968.md) | Nov 7, 2026 |
| Linux | openssl-libs ol 9 | 1:3.5.8-2.0.1.el9_8 | [ELSA-2026-77396](https://patchblox.com/security/data/fix/linux/elsa-2026-77396.md) | Oct 8, 2026 |
| Linux | openssl-libs-debuginfo amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-perl RHEL 8 | 1:1.1.1k-18.el8_6 | [RHSA-2026:85968](https://patchblox.com/security/data/fix/linux/rhsa-2026-85968.md) | Oct 21, 2026 |
| Linux | openssl-perl RHEL 9 | 1:3.5.8-2.el9_8 | [RHSA-2026:77396](https://patchblox.com/security/data/fix/linux/rhsa-2026-77396.md) | Oct 9, 2026 |
| Linux | openssl-perl almalinux 10 | 1:3.5.8-2.el10_2.alma.1 | [ALSA-2026:76918](https://patchblox.com/security/data/fix/linux/alsa-2026-76918.md) | Oct 6, 2026 |
| Linux | openssl-perl almalinux 8 | 1:1.1.1k-18.el8_6 | [ALSA-2026:85968](https://patchblox.com/security/data/fix/linux/alsa-2026-85968.md) | Nov 7, 2026 |
| Linux | openssl-perl almalinux 9 | 1:3.5.8-2.el9_8 | [ALSA-2026:77396](https://patchblox.com/security/data/fix/linux/alsa-2026-77396.md) | Oct 7, 2026 |
| Linux | openssl-perl amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-perl ol 10 | 1:3.5.8-2.0.1.el10_2 | [ELSA-2026-76918](https://patchblox.com/security/data/fix/linux/elsa-2026-76918.md) | Oct 8, 2026 |
| Linux | openssl-perl ol 8 | 1:1.1.1k-18.el8_6 | [ELSA-2026-85968](https://patchblox.com/security/data/fix/linux/elsa-2026-85968.md) | Nov 7, 2026 |
| Linux | openssl-perl ol 9 | 1:3.5.8-2.0.1.el9_8 | [ELSA-2026-77396](https://patchblox.com/security/data/fix/linux/elsa-2026-77396.md) | Oct 8, 2026 |
| Linux | openssl-provider-legacy Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.6 | [openssl-provider-legacy 3.5.5-1ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-openssl-provider-legacy-3.5.5-1ubuntu3.6.md) | Sep 28, 2026 |
| Linux | openssl-snapsafe-libs amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-snapsafe-libs-debuginfo amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | [ALAS2023-2026-3204](https://patchblox.com/security/data/fix/linux/alas2023-2026-3204.md) | Nov 7, 2026 |
| Linux | openssl-static ol 8 | 2:1.1.1k-18.ksplice1.el8_6 | [ELSA-2026-500498](https://patchblox.com/security/data/fix/linux/elsa-2026-500498.md) | Nov 7, 2026 |
| Linux | openssl1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.13+esm7 | [openssl1.0 1.0.2n-1ubuntu5.13+esm7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl1.0-1.0.2n-1ubuntu5.13-esm7.md) | Oct 1, 2026 |

---

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