Description
Issue summary: When an application drives an AES-OCB context through the
public EVP_Cipher() one-shot interface, the application-supplied
initialisation vector (IV) is silently discarded.
Impact summary: Every message encrypted under the same key uses the
same effective nonce regardless of the IV supplied by the caller,
resulting in (key, nonce) reuse and loss of confidentiality. If the
same code path is used to compute the authentication tag, the tag
depends only on the (key, IV) pair and not on the plaintext or
ciphertext, allowing universal forgery of arbitrary ciphertext from a
single captured message.
OpenSSL provides two ways to drive a cipher: the documented streaming
interface (EVP_CipherUpdate / EVP_CipherFinal_ex) and a lower-level
one-shot, EVP_Cipher(), whose documentation explicitly recommends
against use by applications in favour of EVP_CipherUpdate() and
EVP_CipherFinal_ex(). The OCB provider's streaming handler flushes
the application-supplied IV into the OCB context before processing
data; the one-shot handler did not. Every call to EVP_Cipher() on an
AES-OCB context therefore ran with the all-zero key-derived offset
state left by cipher initialisation, regardless of the caller's IV.
If EVP_EncryptFinal_ex() is subsequently used to obtain the
authentication tag, the deferred IV setup runs at that point and
clears the running checksum that should have been accumulated over the
plaintext. The resulting tag is a function of (key, IV) only and
verifies against any ciphertext produced under the same (key, IV)
pair.
The OpenSSL SSL/TLS implementation is not affected: AES-OCB is not a
TLS cipher suite, and libssl does not call EVP_Cipher() in any case.
Applications that drive AES-OCB through the documented streaming AEAD
API (EVP_CipherUpdate / EVP_CipherFinal_ex) are not affected. Only
applications that combine the AES-OCB cipher with the EVP_Cipher()
one-shot API are vulnerable.
The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by
this issue, as AES-OCB is outside the OpenSSL FIPS module boundary.
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 4 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 | — |
| Ubuntu Pro 22.04 LTS | nodejs | 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 | 1:3.5.8-0.1.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 | openssl-3 | 3.2.3-150700.5.36.1 | SUSE-SU-2026:2648-1 |
| SLES 15 SP6 | openssl-3 | 3.1.4-150600.5.53.1 | SUSE-SU-2026:2393-1 |
| SLES 15 SP5 | openssl-3 | 3.0.8-150500.5.66.1 | SUSE-SU-2026:2397-1 |
| SLES 15 SP4 | openssl-3 | 3.0.8-150400.4.87.1 | SUSE-SU-2026:2598-1 |
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 |
| SLES for SAP 15 SP5 | openssl-3 | 3.0.8-150500.5.66.1 | SUSE-SU-2026:2397-1 |
| SLES for SAP 15 SP4 | openssl-3 | 3.0.8-150400.4.87.1 | SUSE-SU-2026:2598-1 |
| 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 | 3.0.8-150400.4.87.1 | SUSE-SU-2026:2598-1 |
| SLE Micro 5.3 | openssl-3 | 3.0.8-150400.4.87.1 | SUSE-SU-2026:2598-1 |
| SLE HPC 15 SP5 | openssl-3 | 3.0.8-150500.5.66.1 | SUSE-SU-2026:2397-1 |
| SLE HPC 15 SP4 | openssl-3 | 3.0.8-150400.4.87.1 | SUSE-SU-2026:2598-1 |
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 36
- RHSA-2026:59635 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:59641 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- 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
- 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-2026:55543 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
- 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
- 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
- SUSE-SU-2026:2648-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 27, 2026
- SUSE-SU-2026:2598-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Jun 24, 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
- SUSE-SU-2026:2397-1 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