CVE-2025-65494

High

Description

NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.

SeverityHigh

CVSS7.5

Exploit probability—

ProductLibcoap

PublishedNov 24, 2025

First seenNov 24, 2025

Weakness typeCWE-476NULL pointer dereference

How to fix

Patches

github.com/obgm/libcoap/pull/1750

Affected products

Product	Affected versions	Fixed in
libcoap libcoap	4.3.5	—

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