CVE-2025-65495

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CVSS 3.1

7.5 high

EPSS

<1%p15

Published

Nov 24, 2025 (Nov 24, 2025)

Modified

Jun 17, 2026

Description

Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted TLS certificate that causes i2d_X509() to return -1 and be misused as a malloc() size parameter.

Vendors: libcoap
Products: libcoap
Weakness: CWE-195
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.2%)

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