Asymmetric Resource Consumption (Amplification) in OpenSSL - CVE-2026-54874

Vulnerability identifier: #VU145420

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-54874

CWE-ID: CWE-405

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to asymmetric resource consumption in DTLS record buffering when receiving future-epoch records during a handshake in progress. A remote attacker can send numerous small forged DTLS records claiming to belong to the next epoch to cause a denial of service.

Up to 100 such records may be buffered per connection, retaining around 1.7 megabytes of memory because the implementation keeps the entire read buffer for each buffered record.

OpenSSL
Debian Linux
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
IBM i
FreeBSD
Ubuntu
Basesystem Module
Development Tools Module
Legacy Module
openSUSE Leap
openEuler
Anolis OS
openssl (Ubuntu package)
libopenssl1_1-32bit
libopenssl1_1
openssl-1_1-debugsource
libopenssl-1_1-devel-32bit
libopenssl1_1-debuginfo-32bit
libopenssl1_1-hmac-32bit
openssl-1_1
openssl-1_1-debuginfo
libopenssl-1_1-devel
libopenssl1_1-debuginfo
libopenssl1_1-hmac
openssl
openssl-debuginfo
openssl-debugsource
openssl-devel
openssl-libs
openssl-help
openssl-1_1-doc
libopenssl1_1-hmac-64bit
libopenssl1_1-64bit-debuginfo
libopenssl-1_1-devel-64bit
libopenssl1_1-64bit
libopenssl1_1-32bit-debuginfo
compat-openssl11-devel
compat-openssl11-libs
compat-openssl11-debuginfo
compat-openssl11
compat-openssl11-debugsource
openssl1.1
openssl1.1-devel
openssl1.1-doc
openssl-perl
libopenssl3-debuginfo
openssl-3-debugsource
libopenssl3-64bit-debuginfo
openssl-3-doc
libopenssl-3-devel-64bit
libopenssl3-64bit
libopenssl-3-devel-32bit
libopenssl3-32bit-debuginfo
libopenssl3-32bit
libopenssl-3-devel
openssl-3-debuginfo
openssl-3
libopenssl3
openssl-doc
libopenssl-3-fips-provider-64bit
libopenssl-3-fips-provider-64bit-debuginfo
libopenssl-3-fips-provider-32bit-debuginfo
libopenssl-3-fips-provider-32bit
libopenssl-3-fips-provider-debuginfo
libopenssl-3-fips-provider
openssl (Debian package)

Install security update from vendor's website.

OpenSSL - addressed in versions 1.0.2zr, 1.1.1zi, 3.0.22, 3.4.7, 3.5.8, 3.6.4, 4.0.2
openssl (Ubuntu package) - addressed in versions 1.0.1f-1ubuntu2.27+esm16, 1.0.2g-1ubuntu4.20+esm18, 1.0.2n-1ubuntu5.13+esm6, 1.1.1f-1ubuntu2.24+esm5, 1.1.1-1ubuntu2.1~18.04.23+esm10, 3.0.2-0ubuntu1.29, 3.0.13-0ubuntu3.15, 3.5.5-1ubuntu3.4, 3.5.5-1ubuntu3.5
libopenssl1_1-32bit - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1, 1.1.1w-150700.11.30.1
libopenssl1_1 - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1, 1.1.1w-150700.11.30.1
openssl-1_1-debugsource - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1, 1.1.1w-150700.11.30.1
libopenssl-1_1-devel-32bit - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1
libopenssl1_1-debuginfo-32bit - update to 1.1.1d-2.139.1
libopenssl1_1-hmac-32bit - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1
openssl-1_1 - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1, 1.1.1w-150700.11.30.1
openssl-1_1-debuginfo - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1, 1.1.1w-150700.11.30.1
libopenssl-1_1-devel - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1, 1.1.1w-150700.11.30.1
libopenssl1_1-debuginfo - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1, 1.1.1w-150700.11.30.1
libopenssl1_1-hmac - addressed in versions 1.1.1d-2.139.1, 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1
openssl - addressed in versions 1.1.1f-44, 1.1.1wa-18, 3.0.12-53, 3.5.6-7
openssl-debuginfo - addressed in versions 1.1.1f-44, 1.1.1wa-18, 3.0.12-53, 3.5.6-7
openssl-debugsource - addressed in versions 1.1.1f-44, 1.1.1wa-18, 3.0.12-53, 3.5.6-7
openssl-devel - addressed in versions 1.1.1f-44, 1.1.1wa-18, 3.0.12-53, 3.5.6-7
openssl-libs - addressed in versions 1.1.1f-44, 1.1.1wa-18, 3.0.12-53, 3.5.6-7
openssl-help - addressed in versions 1.1.1f-44, 1.1.1wa-18, 3.0.12-53, 3.5.6-7
openssl-1_1-doc - addressed in versions 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1
libopenssl1_1-hmac-64bit - addressed in versions 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1
libopenssl1_1-64bit-debuginfo - addressed in versions 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1
libopenssl-1_1-devel-64bit - addressed in versions 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1
libopenssl1_1-64bit - addressed in versions 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1
libopenssl1_1-32bit-debuginfo - addressed in versions 1.1.1l-150400.7.104.1, 1.1.1l-150500.17.63.1, 1.1.1w-150600.5.38.1, 1.1.1w-150700.11.30.1
compat-openssl11-devel - update to 1.1.1m-20
compat-openssl11-libs - update to 1.1.1m-20
compat-openssl11-debuginfo - update to 1.1.1m-20
compat-openssl11 - update to 1.1.1m-20
compat-openssl11-debugsource - update to 1.1.1m-20
openssl1.1 - update to 1.1.1q-14
openssl1.1-devel - update to 1.1.1q-14
openssl1.1-doc - update to 1.1.1q-14
openssl-perl - addressed in versions 1.1.1wa-18, 3.0.12-53, 3.5.6-7
libopenssl3-debuginfo - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
openssl-3-debugsource - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl3-64bit-debuginfo - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
openssl-3-doc - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
libopenssl-3-devel-64bit - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
libopenssl3-64bit - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
libopenssl-3-devel-32bit - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1
libopenssl3-32bit-debuginfo - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl3-32bit - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-devel - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
openssl-3-debuginfo - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
openssl-3 - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl3 - addressed in versions 3.0.8-150400.4.98.1, 3.0.8-150500.5.75.1, 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
openssl-perl - update to 3.0.12-29
openssl-devel - update to 3.0.12-29
openssl - update to 3.0.12-29
openssl-libs - update to 3.0.12-29
openssl-doc - update to 3.0.12-29
libopenssl-3-fips-provider-64bit - update to 3.1.4-150600.5.64.1
libopenssl-3-fips-provider-64bit-debuginfo - update to 3.1.4-150600.5.64.1
libopenssl-3-fips-provider-32bit-debuginfo - addressed in versions 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-fips-provider-32bit - addressed in versions 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-fips-provider-debuginfo - addressed in versions 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
libopenssl-3-fips-provider - addressed in versions 3.1.4-150600.5.64.1, 3.5.0-150700.5.50.1
openssl (Debian package) - update to 3.5.7-1~deb13u2

• https://openssl-library.org/news/secadv/20260825.txt

• Multiple vulnerabilities in OpenSSL
• Debian update for openssl
• FreeBSD update for OpenSSL
• Ubuntu update for openssl
• Ubuntu update for openssl
• SUSE update for openssl-3
• Ubuntu update for openssl
• SUSE update for openssl-3
• SUSE update for openssl-1_1
• SUSE update for openssl-1_1
• SUSE update for openssl-3
• SUSE update for openssl-1_1
• SUSE update for openssl-3
• SUSE update for openssl-1_1
• SUSE update for openssl-1_1
• openEuler 24.03 LTS SP4 update for openssl
• openEuler 24.03 LTS SP3 update for openssl
• openEuler 24.03 LTS SP1 update for openssl
• openEuler 22.03 LTS SP4 update for openssl
• openEuler 20.03 LTS SP4 update for openssl
• openEuler 24.03 LTS SP4 update for compat-openssl11
• openEuler 24.03 LTS SP1 update for compat-openssl11
• openEuler 24.03 LTS SP3 update for compat-openssl11
• Anolis OS update for openssl
• Anolis OS update for openssl1.1
• Multiple vulnerabilities in IBM i