Bug 2416826 (CVE-2025-65498)

Summary: CVE-2025-65498 libcoap: NULL pointer dereference during DTLS operations
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libcoap. A remote attacker can cause a denial of service via a NULL pointer dereference due to improper handling of the return values of OpenSSL functions during DTLS (Datagram Transport Layer Security) operations.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2417725, 2417726    
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Description OSIDB Bzimport 2025-11-24 19:01:55 UTC 
NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.