CVE-2025-59391: A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before…
CVE-2025-59391 · Severity: medium · CVSS 6.5 · Published 2025-12-08
A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.
No. Junglewise Threat Intelligence has no report of CVE-2025-59391 being exploited in the wild.
How severe is CVE-2025-59391?
Medium severity, with a CVSS score of 6.5, published 8 December 2025.
Which products and versions are affected?
Libcoap. The advisory does not name versions.
Is there a fix for CVE-2025-59391?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-59391?
Check whether you run Libcoap. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.