Description
Issue summary: When using the low-level OCB API directly with AES-NI or<br>other hardware-accelerated code paths, inputs whose length is not a multiple<br>of 16 bytes can leave the final partial block unencrypted and unauthenticated.<br><br>Impact summary: The trailing 1-15 bytes of a message may be exposed in<br>cleartext on encryption and are not covered by the authentication tag,<br>allowing an attacker to read or tamper with those bytes without detection.<br><br>The low-level OCB encrypt and decrypt routines in the hardware-accelerated<br>stream path process full 16-byte blocks but do not advance the input/output<br>pointers. The subsequent tail-handling code then operates on the original<br>base pointers, effectively reprocessing the beginning of the buffer while<br>leaving the actual trailing bytes unprocessed. The authentication checksum<br>also excludes the true tail bytes.<br><br>However, typical OpenSSL consumers using EVP are not affected because the<br>higher-level EVP and provider OCB implementations split inputs so that full<br>blocks and trailing partial blocks are processed in separate calls, avoiding<br>the problematic code path. Additionally, TLS does not use OCB ciphersuites.<br>The vulnerability only affects applications that call the low-level<br>CRYPTO_ocb128_encrypt() or CRYPTO_ocb128_decrypt() functions directly with<br>non-block-aligned lengths in a single call on hardware-accelerated builds.<br>For these reasons the issue was assessed as Low severity.<br><br>The FIPS modules in 3.6, 3.5, 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected<br>by this issue, as OCB mode is not a FIPS-approved algorithm.<br><br>OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.<br><br>OpenSSL 1.0.2 is not affected by this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenSSL | OpenSSL | 3.6.0 – < 3.6.1, 3.5.0 – < 3.5.5, 3.4.0 – < 3.4.4, 3.3.0 – < 3.3.6, 3.0.0 – < 3.0.19, 1.1.1 – < 1.1.1ze | 3.6.1 |
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 | 3.5.5-1 | — |
| Debian 13 | openssl | 3.5.4-1~deb13u2 | DSA-6113-1 |
| Debian 12 | openssl | 3.0.18-1~deb12u2 | DSA-6113-1 |
| Debian 11 | openssl | 1.1.1w-0+deb11u5 | DLA-4490-1 |
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 | 3.5.5-1ubuntu1 | — |
| Ubuntu 25.10 | edk2 | No fix yet | — |
| Ubuntu 25.10 | openssl | 3.5.3-1ubuntu3 | USN-7980-1 |
| Ubuntu 24.04 LTS | edk2 | No fix yet | — |
| Ubuntu 24.04 LTS | openssl | 3.0.13-0ubuntu3.7 | USN-7980-1 |
| Ubuntu 22.04 LTS | edk2 | No fix yet | — |
| Ubuntu 22.04 LTS | openssl | 3.0.2-0ubuntu1.21 | USN-7980-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | openssl | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | openssl-fips | 3.0.13-0ubuntu3.12+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl | 3.0.2-0ubuntu1.21+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | openssl-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | openssl | 1.1.1f-1ubuntu2.fips.24.2 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | openssl | 1.1.1-1ubuntu2.fips.2.1~18.04.23.7 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | openssl +1 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 20.04 LTS | edk2 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | openssl | 1.1.1f-1ubuntu2.24+esm2 | — |
| Ubuntu Pro 18.04 LTS | edk2 +1 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | openssl | 1.1.1-1ubuntu2.1~18.04.23+esm7 | — |
| Ubuntu Pro 16.04 LTS | edk2 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | openssl +3 | 1:3.5.1-7.el10_1 | RHSA-2026:1472 |
| RHEL 9 | openssl +3 | 1:3.5.1-7.el9_7 | RHSA-2026:1473 |
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 | openssl +5 | 3.5.6-0.1.hum1 | RHSA-2026:7261 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | openssl +3 | 1:3.5.1-7.el10_1.alma.1 | ALSA-2026:1472 |
| AlmaLinux 9 | openssl +3 | 1:3.5.1-7.el9_7 | ALSA-2026:1473 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | openssl | 1:3.5.1-7.el10_1 | RLSA-2026:1472 |
| Rocky Linux 9 | openssl | 1:3.5.1-7.el9_7 | RLSA-2026:1473 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openssl-1_1 | 1.1.1w-150700.11.11.1 | SUSE-SU-2026:0331-1 |
| SLES 15 SP7 | openssl-3 | 3.2.3-150700.5.24.1 | SUSE-SU-2026:0309-1 |
| SLES 15 SP6 | openssl-1_1 | 1.1.1w-150600.5.21.1 | SUSE-SU-2026:0346-1 |
| SLES 15 SP6 | openssl-3 | 3.1.4-150600.5.42.1 | SUSE-SU-2026:0312-1 |
| SLES 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.46.1 | SUSE-SU-2026:0359-1 |
| SLES 15 SP5 | openssl-3 | 3.0.8-150500.5.57.1 | SUSE-SU-2026:0311-1 |
| SLES 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLES 15 SP4 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
| SLES 12 SP5 | openssl-1_1 | 1.1.1d-2.122.1 | SUSE-SU-2026:0358-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | openssl-3 | 3.5.0-160000.5.1 | SUSE-SU-2026:20223-1 |
| SLES for SAP 15 SP6 | openssl-1_1 | 1.1.1w-150600.5.21.1 | SUSE-SU-2026:0346-1 |
| SLES for SAP 15 SP6 | openssl-3 | 3.1.4-150600.5.42.1 | SUSE-SU-2026:0312-1 |
| SLES for SAP 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.46.1 | SUSE-SU-2026:0359-1 |
| SLES for SAP 15 SP5 | openssl-3 | 3.0.8-150500.5.57.1 | SUSE-SU-2026:0311-1 |
| SLES for SAP 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLES for SAP 15 SP4 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
| SLES 16.0 | openssl-3 | 3.5.0-160000.5.1 | SUSE-SU-2026:20223-1 |
| SLE Micro 6.2 | openssl-3 | 3.5.0-160000.5.1 | SUSE-SU-2026:20211-1 |
| SLE Micro 6.1 | openssl-3 | 3.1.4-slfo.1.1_8.1 | SUSE-SU-2026:20373-1 |
| SLE Micro 6.0 | openssl-3 | 3.1.4-11.1 | SUSE-SU-2026:20349-1 |
| SLE Micro 5.5 | openssl-1_1 | 1.1.1l-150500.17.46.1 | SUSE-SU-2026:0359-1 |
| SLE Micro 5.4 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLE Micro 5.4 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
| SLE Micro 5.3 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLE Micro 5.3 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
| SLE Micro 5.2 | openssl-1_1 | 1.1.1d-150200.11.106.1 | SUSE-SU-2026:0343-1 |
| SLE HPC 15 SP5 | openssl-1_1 | 1.1.1l-150500.17.46.1 | SUSE-SU-2026:0359-1 |
| SLE HPC 15 SP5 | openssl-3 | 3.0.8-150500.5.57.1 | SUSE-SU-2026:0311-1 |
| SLE HPC 15 SP4 | openssl-1_1 | 1.1.1l-150400.7.87.1 | SUSE-SU-2026:0360-1 |
| SLE HPC 15 SP4 | openssl-3 | 3.0.8-150400.4.78.1 | SUSE-SU-2026:0310-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-3 | 3.5.3-2.1 | openSUSE-SU-2026:10237-1 |
| openSUSE Leap 16.0 | openssl-3 | 3.5.0-160000.5.1 | openSUSE-SU-2026:20152-1 |
| openSUSE Leap 15.6 | openssl-1_1 | 1.1.1w-150600.5.21.1 | SUSE-SU-2026:0346-1 |
| openSUSE Leap 15.6 | openssl-3 | 3.1.4-150600.5.42.1 | SUSE-SU-2026:0312-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openssl | 3.5.5-r0 | — |
| Alpine v3.23 | openssl | 3.5.5-r0 | — |
| Alpine v3.22 | openssl | 3.5.5-r0 | — |
| Alpine v3.21 | openssl | 3.3.6-r0 | — |
| Alpine v3.20 | openssl | 3.3.6-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.17 | openssl | 3.0.19-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | openssl +5 | 1:3.2.2-1.amzn2023.0.5 | ALAS2023-2026-1434 |
| Amazon Linux 2 | edk2-ovmf +3 | 20240813-306.amzn2 | ALAS2-2026-3150 |
| Amazon Linux 2 | openssl11 +3 | 1:1.1.1zf-1.amzn2.0.1 | ALAS2-2026-3169 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | edk2 | 20240524git3e722403cd16-14 | — |
| Azure Linux 3 | nodejs24 | 24.13.0-3 | — |
| Azure Linux 3 | openssl | 3.3.5-3 | — |
| Azure Linux 3 | openssl-fips-provider | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | edk2 | 20230301gitf80f052277c8-47 | — |
| Azure Linux 2 (CBL-Mariner) | hvloader | 1.0.1-18 | — |
| Azure Linux 2 (CBL-Mariner) | openssl | 1.1.1k-38 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | openssl +3 | 1:3.5.1-7.0.1.el10_1 | ELSA-2026-1472 |
| Oracle Linux 9 | openssl +3 | 1:3.5.1-7.0.1.el9_7 | ELSA-2026-50075, ELSA-2026-1473 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | openssl | 3.6.1-r0 | — |
Advisories 45
- WID-SEC-2026-2189 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- WID-SEC-2026-0234 OpenSSL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- ALSA-2026:1472 Important: openssl security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:1473 Important: openssl security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-7980-1 openssl vulnerabilities Ubuntu Security Notices (USN) · 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-2026:7261 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement 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-2026:1472 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:1473 Red Hat Security Advisory: openssl security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SSA-265688 SSA-265688: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2026-2253 IBM Security Verify Access: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- VDE-2026-076 ads-tec Industrial IT: Multiple Vulnerabilities in ADS-TEC IRF Products CERT@VDE · Jul 28, 2026
- VDE-2026-081 Weidmueller: Security routers IE-SR-4TX and IE-SR-4GT are affected by multiple vulnerabilities CERT@VDE · Jul 28, 2026
- WID-SEC-2026-1730 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 16, 2026
- ICSA-24-102-01 Siemens SIMATIC S7-1500 TM MFP CISA ICS & IT advisories · May 14, 2026
- WID-SEC-2026-0778 Dell Secure Connect Gateway Policy Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 2026
- openSUSE-SU-2026:20152-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10237-1 libopenssl-3-devel-3.5.3-2.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20349-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20223-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20211-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0358-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0359-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0343-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0331-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0360-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20373-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-4490-1 openssl - security update Debian Security (DSA / DLA) · Feb 23, 2026
- ALAS2-2026-3150 Important: edk2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- ALAS2-2026-3169 Important: openssl11 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- ALAS2023-2026-1434 Important: openssl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- SUSE-SU-2026:0312-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2026:0311-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2026:0346-1 Security update for openssl-1_1 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2026:0310-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2026:0309-1 Security update for openssl-3 SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2026:1472 Important: openssl security update Rocky Linux Security Advisories · Jan 30, 2026
- RLSA-2026:1473 Important: openssl security update Rocky Linux Security Advisories · Jan 30, 2026
- ELSA-2026-50075 Important: openssl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jan 29, 2026
- ELSA-2026-1472 Important: openssl security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jan 28, 2026
- ELSA-2026-1473 Important: openssl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jan 28, 2026
- DSA-6113-1 openssl - security update Debian Security (DSA / DLA) · Jan 27, 2026
References
- OpenSSL Advisory vendor-advisory
- 3.6.1 git commit patch
- 3.5.5 git commit patch
- 3.4.4 git commit patch
- 3.3.6 git commit patch
- 3.0.19 git commit patch