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.
High
CVSS
8.2
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0083
57th percentile
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
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| compat-openssl10 · RHEL 8 | 1:1.0.2o-4.el8_10.4 | RHSA-2026:80510 | Oct 12, 2026 |
| compat-openssl10 · almalinux 8 | 1:1.0.2o-4.el8_10.4 | ALSA-2026:80510 | Nov 7, 2026 |
| compat-openssl10 · ol 8 | 1:1.0.2o-4.el8_10.4 | ELSA-2026-80510 | Nov 7, 2026 |
| compat-openssl10 · rocky 8 | 1:1.0.2o-4.el8_10.4 | RLSA-2026:80510 | Nov 7, 2026 |
| compat-openssl11 · RHEL 9 | 1:1.1.1k-5.el9_8.6 | RHSA-2026:80514 | Oct 12, 2026 |
| compat-openssl11 · almalinux 9 | 1:1.1.1k-5.el9_8.6 | ALSA-2026:80514 | Nov 7, 2026 |
| compat-openssl11 · ol 9 | 1:1.1.1k-5.el9_8.6 | ELSA-2026-80514 | Nov 7, 2026 |
| compat-openssl11 · rocky 9 | 1:1.1.1k-5.el9_8.6 | RLSA-2026:80514 | Nov 7, 2026 |
| edk2-aarch64 · amzn 2023 | 20260508-2.amzn2023 | ALAS2023-2026-3227 | Nov 7, 2026 |
| edk2-ovmf · amzn 2023 | 20260508-2.amzn2023 | ALAS2023-2026-3227 | Nov 7, 2026 |
| edk2-shell-aa64 · amzn 2023 | 20260508-2.amzn2023 | ALAS2023-2026-3227 | Nov 7, 2026 |
| edk2-shell-x64 · amzn 2023 | 20260508-2.amzn2023 | ALAS2023-2026-3227 | Nov 7, 2026 |
| libssl1.0.0 · Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.13+esm7 | libssl1.0.0 1.0.2n-1ubuntu5.13+esm7 | Oct 1, 2026 |
| 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 | Oct 1, 2026 |
| libssl1.1 · Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.24+esm6 | libssl1.1 1.1.1f-1ubuntu2.24+esm6 | Oct 1, 2026 |
| libssl3 · Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.30 | libssl3 3.0.2-0ubuntu1.30 | Sep 30, 2026 |
| libssl3t64 · Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.16 | libssl3t64 3.0.13-0ubuntu3.16 | Sep 30, 2026 |
| libssl3t64 · Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.6 | libssl3t64 3.5.5-1ubuntu3.6 | Sep 28, 2026 |
| openssl · Debian 12.15 (bookworm) | 3.0.22-1~deb12u2 | DEBIAN-CVE-2026-84782 | Sep 30, 2026 |
| openssl · Debian 13.5 (trixie) | 3.5.7-1~deb13u3 | DEBIAN-CVE-2026-84782 | Sep 30, 2026 |
| openssl · Debian 14 | 3.6.5-1 | DEBIAN-CVE-2026-84782 | Sep 30, 2026 |
| openssl · RHEL 10 | 3.5.8-2.el10_2 | RHSA-2026:76918 | Oct 9, 2026 |
| openssl · RHEL 8 | 1:1.1.1k-18.el8_6 | RHSA-2026:85968 | Oct 21, 2026 |
| openssl · RHEL 9 | 1:3.5.8-2.el9_8 | RHSA-2026:77396 | Oct 9, 2026 |
| 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 | Oct 1, 2026 |
| openssl · Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.24+esm6 | openssl 1.1.1f-1ubuntu2.24+esm6 | Oct 1, 2026 |
| openssl · Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.30 | openssl 3.0.2-0ubuntu1.30 | Sep 30, 2026 |
| openssl · Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.16 | openssl 3.0.13-0ubuntu3.16 | Sep 30, 2026 |
| openssl · Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.6 | openssl 3.5.5-1ubuntu3.6 | Sep 28, 2026 |
| openssl · almalinux 10 | 1:3.5.8-2.el10_2.alma.1 | ALSA-2026:76918 | Oct 6, 2026 |
| openssl · almalinux 8 | 1:1.1.1k-18.el8_6 | ALSA-2026:85968 | Nov 7, 2026 |
| openssl · almalinux 9 | 1:3.5.8-2.el9_8 | ALSA-2026:77396 | Oct 7, 2026 |
| openssl · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl · ol 10 | 1:3.5.8-2.0.1.el10_2 | ELSA-2026-76918 | Oct 8, 2026 |
| openssl · ol 8 | 1:1.1.1k-18.el8_6 | ELSA-2026-85968 | Nov 7, 2026 |
| openssl · ol 9 | 1:3.5.8-2.0.1.el9_8 | ELSA-2026-77396 | Oct 8, 2026 |
| openssl · rocky 10 | 1:3.5.8-2.el10_2 | RLSA-2026:76918 | Nov 7, 2026 |
| openssl · rocky 9 | 1:3.5.8-2.el9_8 | RLSA-2026:77396 | Nov 7, 2026 |
| openssl-3 · opensuse-leap 16.0 | 3.5.0-160000.11.1 | OPENSUSE-SU-2026:22102-1 | Nov 7, 2026 |
| openssl-3 · sles 15.6 | 3.1.4-150600.5.67.1 | SUSE-SU-2026:4419-1 | Oct 2, 2026 |
| openssl-3 · sles 15.7 | 3.5.0-150700.5.53.2 | SUSE-SU-2026:4414-1 | Oct 2, 2026 |
| openssl-3 · sles 16.0 | 3.5.0-160000.11.1 | SUSE-SU-2026:24245-1 | Nov 7, 2026 |
| openssl-3-livepatches · sles 15.6 | 0.7-150600.13.22.1 | SUSE-SU-2026:4418-1 | Oct 2, 2026 |
| openssl-3-livepatches · sles 15.7 | 0.7-150700.16.15.1 | SUSE-SU-2026:4560-1 | Oct 7, 2026 |
| openssl-debuginfo · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-debugsource · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-devel · RHEL 8 | 1:1.1.1k-18.el8_6 | RHSA-2026:85968 | Oct 21, 2026 |
| openssl-devel · RHEL 9 | 1:3.5.8-2.el9_8 | RHSA-2026:77396 | Oct 9, 2026 |
| openssl-devel · almalinux 10 | 1:3.5.8-2.el10_2.alma.1 | ALSA-2026:76918 | Oct 6, 2026 |
| openssl-devel · almalinux 8 | 1:1.1.1k-18.el8_6 | ALSA-2026:85968 | Nov 7, 2026 |
| openssl-devel · almalinux 9 | 1:3.5.8-2.el9_8 | ALSA-2026:77396 | Oct 7, 2026 |
| openssl-devel · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-devel · ol 10 | 1:3.5.8-2.0.1.el10_2 | ELSA-2026-76918 | Oct 8, 2026 |
| openssl-devel · ol 8 | 1:1.1.1k-18.el8_6 | ELSA-2026-85968 | Nov 7, 2026 |
| openssl-devel · ol 9 | 1:3.5.8-2.0.1.el9_8 | ELSA-2026-77396 | Oct 8, 2026 |
| openssl-fips-provider-latest · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-fips-provider-latest-debuginfo · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-libs · RHEL 8 | 1:1.1.1k-18.el8_6 | RHSA-2026:85968 | Oct 21, 2026 |
| openssl-libs · RHEL 9 | 1:3.5.8-2.el9_8 | RHSA-2026:77396 | Oct 9, 2026 |
| openssl-libs · almalinux 10 | 1:3.5.8-2.el10_2.alma.1 | ALSA-2026:76918 | Oct 6, 2026 |
| openssl-libs · almalinux 8 | 1:1.1.1k-18.el8_6 | ALSA-2026:85968 | Nov 7, 2026 |
| openssl-libs · almalinux 9 | 1:3.5.8-2.el9_8 | ALSA-2026:77396 | Oct 7, 2026 |
| openssl-libs · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-libs · ol 10 | 1:3.5.8-2.0.1.el10_2 | ELSA-2026-76918 | Oct 8, 2026 |
| openssl-libs · ol 8 | 1:1.1.1k-18.el8_6 | ELSA-2026-85968 | Nov 7, 2026 |
| openssl-libs · ol 9 | 1:3.5.8-2.0.1.el9_8 | ELSA-2026-77396 | Oct 8, 2026 |
| openssl-libs-debuginfo · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-perl · RHEL 8 | 1:1.1.1k-18.el8_6 | RHSA-2026:85968 | Oct 21, 2026 |
| openssl-perl · RHEL 9 | 1:3.5.8-2.el9_8 | RHSA-2026:77396 | Oct 9, 2026 |
| openssl-perl · almalinux 10 | 1:3.5.8-2.el10_2.alma.1 | ALSA-2026:76918 | Oct 6, 2026 |
| openssl-perl · almalinux 8 | 1:1.1.1k-18.el8_6 | ALSA-2026:85968 | Nov 7, 2026 |
| openssl-perl · almalinux 9 | 1:3.5.8-2.el9_8 | ALSA-2026:77396 | Oct 7, 2026 |
| openssl-perl · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-perl · ol 10 | 1:3.5.8-2.0.1.el10_2 | ELSA-2026-76918 | Oct 8, 2026 |
| openssl-perl · ol 8 | 1:1.1.1k-18.el8_6 | ELSA-2026-85968 | Nov 7, 2026 |
| openssl-perl · ol 9 | 1:3.5.8-2.0.1.el9_8 | ELSA-2026-77396 | Oct 8, 2026 |
| openssl-provider-legacy · Ubuntu 26.04.1 LTS (resolute) | 3.5.5-1ubuntu3.6 | openssl-provider-legacy 3.5.5-1ubuntu3.6 | Sep 28, 2026 |
| openssl-snapsafe-libs · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-snapsafe-libs-debuginfo · amzn 2023 | 1:3.5.8-1.amzn2023.0.3 | ALAS2023-2026-3204 | Nov 7, 2026 |
| openssl-static · ol 8 | 2:1.1.1k-18.ksplice1.el8_6 | ELSA-2026-500498 | Nov 7, 2026 |
| openssl1.0 · Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.13+esm7 | openssl1.0 1.0.2n-1ubuntu5.13+esm7 | Oct 1, 2026 |
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