Description
liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Multiple secret-dependent branches have been identified in the reference implementation of the HQC key encapsulation mechanism when it is compiled with Clang for optimization levels above -O0 (-O1, -O2, etc). A proof-of-concept local attack exploits this secret-dependent information to recover the entire secret key. This vulnerability is fixed in 0.14.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| open-quantum-safe | liboqs | < 0.14.0 | — |
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.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | liboqs | 0.16.0-150600.3.6.1 | SUSE-SU-2026:3420-1 |
| SLES 15 SP7 | oqs-provider | 0.11.0.32-150600.3.9.1 | SUSE-SU-2026:3420-1 |
| SLES 15 SP6 | liboqs | 0.16.0-150600.3.6.1 | SUSE-SU-2026:3420-1 |
| SLES 15 SP6 | oqs-provider | 0.11.0.32-150600.3.9.1 | SUSE-SU-2026:3420-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | liboqs | 0.16.0-160000.1.1 | SUSE-SU-2026:23313-1 |
| SLES for SAP 16.0 | oqs-provider | 0.11.0.32-160000.1.1 | SUSE-SU-2026:23313-1 |
| SLES for SAP 15 SP6 | liboqs | 0.16.0-150600.3.6.1 | SUSE-SU-2026:3420-1 |
| SLES for SAP 15 SP6 | oqs-provider | 0.11.0.32-150600.3.9.1 | SUSE-SU-2026:3420-1 |
| SLES 16.0 | liboqs | 0.16.0-160000.1.1 | SUSE-SU-2026:23313-1 |
| SLES 16.0 | oqs-provider | 0.11.0.32-160000.1.1 | SUSE-SU-2026:23313-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | liboqs | 0.14.0-1.1 | openSUSE-SU-2025:15339-1 |
| openSUSE Leap 16.0 | liboqs | 0.16.0-160000.1.1 | openSUSE-SU-2026:21634-1 |
| openSUSE Leap 16.0 | oqs-provider | 0.11.0.32-160000.1.1 | openSUSE-SU-2026:21634-1 |
Advisories 4
- SUSE-SU-2026:23313-1 Security update for liboqs SUSE / openSUSE Security Updates · Sep 25, 2026
- openSUSE-SU-2026:21634-1 Security update for liboqs SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:3420-1 Security update for liboqs, oqs-provider SUSE / openSUSE Security Updates · Jul 30, 2026
- openSUSE-SU-2025:15339-1 liboqs-devel-0.14.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026