Description
Issue Summary: Cryptographic Message Services (CMS) processing fails to perform
sufficient input validation on the cipher and tag length fields of
AuthEnvelopedData containers, leading to various potential compromises.
Impact Summary: Attackers making use of these vulnerabilities may achieve
key-equivalent functionality for a given CMS recipient and/or bypass integrity
validation for a given message.
In one use case, an attacker may send a CMS message containing
AuthEnvelopedData with the cipher specified as a non-AEAD cipher. OpenSSL
erroneously allows this selection, and attempts to decrypt and validate the
message.
An on-path attacker who captures one legitimate AES-GCM AuthEnvelopedData
addressed to the victim can re-emit it with the recipientInfos set left
byte-for-byte intact, so the victim's private key still unwraps the genuine CEK
(the content-encryption key), but with the inner OID rewritten to AES-256-OFB
(Output Feedback Mode, an unauthenticated keystream mode) and with an
attacker-chosen IV and ciphertext. The victim initializes AES-256-OFB under the
real CEK, never consults the MAC field, and CMS_decrypt() returns success.
If the application under attack responds to the attacker with any indicator
showing success or failure of the decryption effort, it is possible for the
attacker to use this as an oracle to obtain key equivalent functionality for the
CEK used for the chosen recipient of the message.
In another use case, an attacker can reduce the tag length of the chosen AEAD
cipher for a given AuthEnvelopedData container to be a single byte long,
allowing an attacker to brute force CMS decryption, producing an integrity
bypass for applications that trust CMS_decrypt() to reject modified content.
The FIPS modules are not affected by this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenSSL | OpenSSL | 4.0.0 – < 4.0.1, 3.6.0 – < 3.6.3, 3.5.0 – < 3.5.7, 3.4.0 – < 3.4.6, 3.0.0 – < 3.0.21 | 4.0.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openssl | 3.6.3-1 | — |
| Debian 13 | openssl | 3.5.6-1~deb13u2 | — |
| Debian 12 | openssl | 3.0.20-1~deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | edk2 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | openssl | 3.5.5-1ubuntu3.2 | — |
| Ubuntu 25.10 | edk2 | No fix yet | — |
| Ubuntu 25.10 | openssl | 3.5.3-1ubuntu3.4 | — |
| Ubuntu 24.04 LTS | edk2 | No fix yet | — |
| Ubuntu 24.04 LTS | openssl | 3.0.13-0ubuntu3.11 | — |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.25 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 24.04 LTS | openssl-fips | 3.0.13-0ubuntu3.12+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl | 3.0.2-0ubuntu1.25+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl-fips | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | openssl +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | openssl +3 | 1:3.5.5-4.el10_2 | RHSA-2026:25237 |
| RHEL 9 | openssl +3 | 1:3.5.5-4.el9_8 | RHSA-2026:25239 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | openssl +3 | 1:3.2.2-16.el10_0.7 | RHSA-2026:71542 |
| RHEL 9.6 EUS | openssl +3 | 1:3.2.2-7.el9_6.4 | RHSA-2026:83617 |
| RHEL 9.4 E4S | openssl +1 | 1:3.0.7-29.el9_4.3 | RHSA-2026:84573 |
| RHEL 9.2 E4S | openssl +1 | 1:3.0.7-18.el9_2.4 | RHSA-2026:84572 |
| Red Hat Hardened Images 1 | bootupd +1 | 0.3.2-1.hum1 | RHSA-2026:67551 |
| Red Hat Hardened Images 1 | chunkah | 0.6.0-3.hum1 | RHSA-2026:42825 |
| Red Hat Hardened Images 1 | openssl +10 | 3.5.8-0.1.hum1 | RHSA-2026:59641, RHSA-2026:59635 |
| Red Hat Hardened Images 1 | python-cryptography +1 | 50.0.0-1.hum1 | RHSA-2026:55543 |
| Red Hat Hardened Images 1 | ruby3.3 +5 | 3.3.10-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | ruby3.4 +5 | 3.4.10-31.7.hum1 | RHSA-2026:62790 |
| Red Hat Hardened Images 1 | ruby4.0 +5 | 4.0.6-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem3.3-bigdecimal | 3.1.5-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-bundler | 2.5.22-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-devel +1 | 3.5.22-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-io-console | 0.7.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-irb | 1.13.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-json | 2.7.2-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-minitest | 5.20.0-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-power_assert | 2.0.3-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-psych | 5.1.2-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-racc | 1.7.3-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rake | 13.1.0-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rbs | 3.4.0-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rdoc | 6.6.3.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rexml | 3.4.4-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-rss | 0.3.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-test-unit | 3.6.1-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem3.3-typeprof | 0.21.9-23.6.hum1 | RHSA-2026:62562 |
| Red Hat Hardened Images 1 | rubygem4.0-bigdecimal | 4.0.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-devel +2 | 4.0.16-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-io-console | 0.8.2-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-irb | 1.16.0-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-json | 2.18.0-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-minitest | 6.0.0-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-power_assert | 3.0.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-psych | 5.3.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-racc | 1.8.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rake | 13.3.1-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rbs | 3.10.0-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rdoc | 7.0.4-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rexml | 3.4.4-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-rss | 0.3.2-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-test-unit | 3.7.5-37.3.hum1 | RHSA-2026:62563 |
| Red Hat Hardened Images 1 | rubygem4.0-typeprof | 0.31.1-37.3.hum1 | RHSA-2026:62563 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | openssl +3 | 1:3.5.5-4.el10_2.alma.1 | ALSA-2026:25237 |
| AlmaLinux 9 | openssl +3 | 1:3.5.5-4.el9_8 | ALSA-2026:25239 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | openssl | 1:3.5.5-4.el10_2 | RLSA-2026:25237 |
| Rocky Linux 9 | openssl | 1:3.5.5-4.el9_8 | RLSA-2026:25239 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | nodejs24 | 24.18.1-150700.15.18.1 | SUSE-SU-2026:3835-1 |
| SLES 15 SP7 | openssl | 3.5.0-150700.3.4.1 | SUSE-SU-2026:3835-1 |
| SLES 15 SP7 | openssl-3 | 3.5.0-150700.5.45.2 | SUSE-SU-2026:3835-1, SUSE-RU-2026:5149-1 |
| SLES 15 SP6 | openssl-3 | 3.1.4-150600.5.53.1 | SUSE-SU-2026:2393-1, SUSE-RU-2026:5150-1 |
| SLES 15 SP5 | openssl-3 | 3.0.8-150500.5.69.1 | SUSE-SU-2026:3005-1, SUSE-RU-2026:5148-1 |
| SLES 15 SP4 | openssl-3 | 3.0.8-150400.4.90.1 | SUSE-SU-2026:3094-1, SUSE-RU-2026:5018-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | openssl-3 | 3.5.0-160000.8.1 | SUSE-SU-2026:22315-1 |
| SLES for SAP 15 SP6 | openssl-3 | 3.1.4-150600.5.53.1 | SUSE-SU-2026:2393-1, SUSE-RU-2026:5150-1 |
| SLES for SAP 15 SP5 | openssl-3 | 3.0.8-150500.5.69.1 | SUSE-SU-2026:3005-1, SUSE-RU-2026:5148-1 |
| SLES for SAP 15 SP4 | openssl-3 | 3.0.8-150400.4.90.1 | SUSE-SU-2026:3094-1, SUSE-RU-2026:5018-1 |
| SLES 16.0 | openssl-3 | 3.5.0-160000.8.1 | SUSE-SU-2026:22315-1 |
| SLE Micro 6.2 | openssl-3 | 3.5.0-160000.8.1 | SUSE-SU-2026:22251-1 |
| SLE Micro 6.1 | openssl-3 | 3.1.4-slfo.1.1_10.1 | SUSE-SU-2026:22132-1 |
| SLE Micro 6.0 | openssl-3 | 3.1.4-14.1 | SUSE-SU-2026:22100-1 |
| SLE Micro 5.4 | openssl-3 | 3.0.8-150400.4.90.1 | SUSE-SU-2026:3094-1, SUSE-RU-2026:5018-1 |
| SLE Micro 5.3 | openssl-3 | 3.0.8-150400.4.90.1 | SUSE-SU-2026:3094-1, SUSE-RU-2026:5018-1 |
| SLE HPC 15 SP5 | openssl-3 | 3.0.8-150500.5.69.1 | SUSE-SU-2026:3005-1, SUSE-RU-2026:5148-1 |
| SLE HPC 15 SP4 | openssl-3 | 3.0.8-150400.4.90.1 | SUSE-SU-2026:3094-1, SUSE-RU-2026:5018-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-3 | 3.5.3-6.1 | openSUSE-SU-2026:11023-1 |
| openSUSE Leap 16.0 | openssl-3 | 3.5.0-160000.8.1 | openSUSE-SU-2026:21005-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssl | 3.5.7-r0 | — |
| Alpine v3.23 | openssl | 3.5.7-r0 | — |
| Alpine v3.22 | openssl | 3.5.7-r0 | — |
| Alpine v3.21 | openssl | 3.3.7-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssl +5 | 1:3.5.5-1.amzn2023.0.5 | ALAS2023-2026-1853 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | edk2 | 20240524git3e722403cd16-18 | — |
| Azure Linux 3 | openssl | 3.3.7-3 | — |
| Azure Linux 3 | openssl-fips-provider | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | openssl +3 | 1:3.5.5-5.0.1.el10_2 | ELSA-2026-25237 |
| Oracle Linux 9 | openssl +3 | 1:3.5.5-4.0.1.el9_8 | ELSA-2026-50379, ELSA-2026-25239 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl +1 | 3.6.3-r0 | — |
| Wolfi rolling | openssl-4.0 +2 | 4.0.1-r0 | — |
Advisories 40
- WID-SEC-2026-2455 Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- WID-SEC-2026-1852 OpenSSL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- SUSE-RU-2026:5149-1 Recommended update for openssl-3 SUSE / openSUSE Security Updates · Nov 10, 2026
- SUSE-RU-2026:5148-1 Recommended update for openssl-3 SUSE / openSUSE Security Updates · Nov 10, 2026
- SUSE-RU-2026:5150-1 Recommended update for openssl-3 SUSE / openSUSE Security Updates · Nov 10, 2026
- SUSE-RU-2026:5018-1 Recommended update for openssl-3 SUSE / openSUSE Security Updates · Nov 3, 2026
- ALSA-2026:25239 Important: openssl security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:25237 Important: openssl security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2919 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- RHSA-2026:84573 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:84572 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:83617 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:71542 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:67551 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:62790 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:62562 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:62563 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:59635 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:59641 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:55543 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:42825 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:25239 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:25237 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SUSE-SU-2026:3835-1 Security update for openssl, openssl-3 SUSE / openSUSE Security Updates · Sep 10, 2026
- VDE-2026-088 METTLER TOLEDO: LabX Standard and Enterprise Report on External Component Analysis - v21.4 CERT@VDE · Sep 10, 2026
- ELSA-2026-25237 Important: openssl security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 28, 2026
- SUSE-SU-2026:3094-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jul 18, 2026
- SUSE-SU-2026:3005-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jul 16, 2026
- ELSA-2026-50379 Moderate: openssl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 7, 2026
- SUSE-SU-2026:22315-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jul 2, 2026
- openSUSE-SU-2026:21005-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:22251-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 30, 2026
- ELSA-2026-25239 Important: openssl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- ALAS2023-2026-1853 Important: openssl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 22, 2026
- SUSE-SU-2026:22132-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 18, 2026
- SUSE-SU-2026:22100-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 17, 2026
- SUSE-SU-2026:2393-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 16, 2026
- openSUSE-SU-2026:11023-1 libopenssl-3-devel-3.5.3-6.1 on GA media SUSE / openSUSE Security Updates · Jun 14, 2026
- RLSA-2026:25237 Important: openssl security update Rocky Linux Security Advisories · Jun 13, 2026
- RLSA-2026:25239 Important: openssl security update Rocky Linux Security Advisories · Jun 13, 2026
References
- OpenSSL Advisory vendor-advisory
- 4.0.1 git commit patch
- 3.6.3 git commit patch
- 3.5.7 git commit patch
- 3.4.6 git commit patch
- 3.0.21 git commit patch