CVE-2025-59391 Affecting libcoap3 package, versions <4.3.5-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-LIBCOAP3-14222439
- published9 Dec 2025
- disclosed8 Dec 2025
Introduced: 8 Dec 2025
CVE-2025-59391 (opens in a new tab)How to fix?
Upgrade Debian:unstable libcoap3 to version 4.3.5-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libcoap3 package and not the libcoap3 package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.