Upstream information
Description
liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Prior to 0.16.0, an out-of-bounds read has been identified in the XMSS and XMSS^MT stateful signature verification code. When the verification function is called with a correctly-sized signature buffer for the declared algorithm but a public key whose OID bytes (pk[0..3]) reference a different XMSS parameter set with a larger sig_bytes, the implementation re-parses the OID from the public key inside xmss_sign_open / xmssmt_sign_open and uses the resulting (larger) sig_bytes to index the caller-supplied signature buffer. As with CVE-2026-44518, the out-of-bounds bytes are consumed only as input to an internal hash computation and are not returned to the caller, so no oracle exists to leak their contents to an attacker. The primary observable effect is a possible crash (denial of service) of the verifying process if the read crosses into an unmapped memory page. This vulnerability is fixed in 0.16.0.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 5.3 | 5.3 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Attack Vector | Network | Network |
| Attack Complexity | Low | Low |
| Privileges Required | None | None |
| User Interaction | None | None |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | None | None |
| Availability Impact | Low | Low |
| CVSSv3 Version | 3.1 | 3.1 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP7 | liboqs | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | liboqs | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | liboqs | Affected |
| SUSE Linux Enterprise Server 15 SP7 | liboqs | Affected |
| SUSE Linux Enterprise Server 16.0 | liboqs | Affected |
| SUSE Linux Enterprise Server 16.1 | liboqs | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | liboqs | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | liboqs | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | liboqs | Affected |
| openSUSE Leap 16.0 | liboqs | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | liboqs | Affected |
| SUSE Linux Enterprise Server 15 SP6 | liboqs | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | liboqs | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | liboqs | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Desktop 15 SP6 | liboqs | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | liboqs | Affected |
| openSUSE Leap 15.6 | liboqs | Affected |
SUSE Timeline for this CVE
CVE page created: Fri May 29 22:24:01 2026CVE page last modified: Mon Jun 1 11:31:01 2026