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01 Record

CVE-2026-84782

DTLS Retransmits Handshake Messages From a Stale Buffer Offset

HighPUBLISHEDCNA: openssl
CNA base score8.2 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
View raw JSON

02 Description

DTLS Retransmits Handshake Messages From a Stale Buffer Offset

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.83% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 57.3% of scored records. A rank, not a probability.
NVD base score
8.2 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-08.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-29 15:32Z29 DAYS AGO
Last updated
2026-09-29 16:45Z29 DAYS AGO
Reserved
2026-09-02
Assigning CNA
openssl
Record state
PUBLISHED
Severity
High (CVSS 8.2)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Weaknesses
Data version
5.2
Document digest
60d75ef684c4b55183a8fd46b9886461fa537bcffa66aaec3d4b628d8aa590c2

05 Affected products

VendorProductVersionsPlatforms
OpenSSLOpenSSL4.0.0 to < 4.0.3, 3.6.0 to < 3.6.5, 3.5.0 to < 3.5.9, 3.4.0 to < 3.4.8, 3.0.0 to < 3.0.23, 1.1.1 to < 1.1.1zj, 1.0.2 to < 1.0.2zs—

06 References

07 Fixed in

AlmaLinux 8

  • compat-openssl10
    Fixed in 1:1.0.2o-4.el8_10.4
  • openssl
    Fixed in 1:1.1.1k-18.el8_6
  • openssl-devel
    Fixed in 1:1.1.1k-18.el8_6
  • openssl-libs
    Fixed in 1:1.1.1k-18.el8_6
  • openssl-perl
    Fixed in 1:1.1.1k-18.el8_6

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • compat-openssl11
    Fixed in 1:1.1.1k-5.el9_8.6
  • openssl
    Fixed in 1:3.5.8-2.el9_8
  • openssl-devel
    Fixed in 1:3.5.8-2.el9_8
  • openssl-libs
    Fixed in 1:3.5.8-2.el9_8
  • openssl-perl
    Fixed in 1:3.5.8-2.el9_8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • openssl
    Fixed in 1:3.5.8-2.el10_2.alma.1
  • openssl-devel
    Fixed in 1:3.5.8-2.el10_2.alma.1
  • openssl-libs
    Fixed in 1:3.5.8-2.el10_2.alma.1
  • openssl-perl
    Fixed in 1:3.5.8-2.el10_2.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • compat-openssl10
    Fixed in 1:1.0.2o-4.el8_10.4
  • openssl
    Fixed in 1:1.1.1k-18.el8_6
  • openssl-devel
    Fixed in 1:1.1.1k-18.el8_6
  • openssl-libs
    Fixed in 1:1.1.1k-18.el8_6
  • openssl-perl
    Fixed in 1:1.1.1k-18.el8_6

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • compat-openssl11
    Fixed in 1:1.1.1k-5.el9_8.6
  • openssl
    Fixed in 1:3.5.8-2.el9_8
  • openssl-devel
    Fixed in 1:3.5.8-2.el9_8
  • openssl-libs
    Fixed in 1:3.5.8-2.el9_8
  • openssl-perl
    Fixed in 1:3.5.8-2.el9_8

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • openssl
    Fixed in 1:3.5.8-2.el10_2.alma.1
  • openssl-devel
    Fixed in 1:3.5.8-2.el10_2.alma.1
  • openssl-libs
    Fixed in 1:3.5.8-2.el10_2.alma.1
  • openssl-perl
    Fixed in 1:3.5.8-2.el10_2.alma.1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • openssl
    Fixed in 3.0.22-1~deb12u2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • openssl
    Fixed in 3.5.7-1~deb13u3

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • openssl
    Fixed in 3.6.5-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • edk2
    No fix yet
  • openssl
    Fixed in 3.0.2-0ubuntu1.30

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • edk2
    No fix yet
  • openssl
    Fixed in 3.0.13-0ubuntu3.16

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • edk2
    No fix yet
  • edk2-hwe
    No fix yet
  • openssl
    Fixed in 3.5.5-1ubuntu3.6

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • edk2
    No fix yet
  • edk2-hwe
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • openssl
    Fixed in 1.0.1f-1ubuntu2.27+esm17
    Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • edk2
    No fix yet
  • nodejs
    No fix yet
  • openssl
    Fixed in 1.0.2g-1ubuntu4.20+esm19
    Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • edk2
    No fix yet
  • nodejs
    No fix yet
  • openssl
    Fixed in 1.1.1-1ubuntu2.1~18.04.23+esm11
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • openssl1.0
    Fixed in 1.0.2n-1ubuntu5.13+esm7
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • edk2
    No fix yet
  • openssl
    Fixed in 1.1.1f-1ubuntu2.24+esm6
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • nodejs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-preview 22.04 LTS

  • openssl
    No fix yet
  • openssl-fips
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 16.04 LTS

  • openssl
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 18.04 LTS

  • openssl
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 20.04 LTS

  • openssl
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 22.04 LTS

  • openssl
    No fix yet
  • openssl-fips
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 24.04 LTS

  • openssl-fips
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS 16.04 LTS

  • openssl
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS 18.04 LTS

  • openssl
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS 20.04 LTS

  • openssl
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.