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Multiple Vulnerabilities in OpenSSL

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: MEDIUM

Software Affected

OpenSSL version 3.6.

OpenSSL version 3.5.

OpenSSL version 3.4.

OpenSSL version 3.3.

OpenSSL version 3.1.

OpenSSL version 3.0.

OpenSSL version 1.1.1

OpenSSL version 1.0.2

Overview

Multiple vulnerabilities have been reported in OpenSSL which could be exploited by an attacker to cause denial of service, or disclosure of sensitive information on the targeted system.

Target Audience:

All end-user organizations and individuals using OpenSSL.

Risk Assessment:

Risk of denial of service and sensitive information disclosure.

Impact Assessment:

Potential service disruption and unauthorized access to sensitive information.

Description

OpenSSL is a free and open-source software for general-purpose cryptography and secure communication. It provides a robust, full-featured toolkit for implementing the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols.

Multiple vulnerabilities exist in OpenSSL due to incorrect failure handling in RSA KEM RSASVE encapsulation; out-of-bounds read in AES-CFB-128 on X86-64 with AVX-512 support; potential use-after-free in DANE Client Code; NULL pointer dereference when processing a Delta CRL; possible NULL dereference when processing CMS KeyAgreeRecipientInfo; possible NULL dereference when processing CMS KeyTransportRecipientInfo; and heap buffer overflow in hexadecimal conversion. A remote attacker could exploit these vulnerabilities by sending specially crafted inputs.

Successful exploitation of these vulnerabilities could allow an attacker to cause a denial of service condition or disclose sensitive information on the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor:

https://openssl-library.org/news/secadv/20260407.txt

Vendor Information

OpenSSL

https://openssl-library.org/news/vulnerabilities/

References

OpenSSL

https://openssl-library.org/news/secadv/20260407.txt

CVE Name

CVE-2026-31790

CVE-2026-28386

CVE-2026-28387

CVE-2026-28388

CVE-2026-28389

CVE-2026-28390

CVE-2026-31789

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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