CVE-2024-37305: Buffer overflow in deserialization in oqs-provider

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-17 · updated 2026-06-17
Weakness: CWE-120

Description

oqs-provider is a provider for the OpenSSL 3 cryptography library that adds support for post-quantum cryptography in TLS, X.509, and S/MIME using post-quantum algorithms from liboqs. Flaws have been identified in the way oqs-provider handles lengths decoded with DECODE_UINT32 at the start of serialized hybrid (traditional + post-quantum) keys and signatures. Unchecked length values are later used for memory reads and writes; malformed input can lead to crashes or information leakage. Handling of plain/non-hybrid PQ key operation is not affected. This issue has been patched in in v0.6.1. All users are advised to upgrade. There are no workarounds for this issue.

Affected products

Open Quantum Safe Oqs Provider: before 0.6.1 — fixed in 0.6.1

How to fix

Upgrade to a fixed version: Open Quantum Safe Oqs Provider 0.6.1. Check the vendor advisory for mitigations.

References

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