CVE-2026-54876 Client-Side Memory Leak in OCSP Response Checking

Issue summary: A malicious TLS server can cause a memory leak in a TLS client that has enabled OCSP response checking by sending an OCSP response that contains no single response entries. Impact summary: An attacker can leak an attacker-tunable amount of memory per TLS handshake in a victim clien...

UBUNTU-CVE-2026-56821

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path...

CVE-2026-56821

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path...

CVE-2026-56821 Netty: Out-of-date OCSP Responses Accepted by OcspServerCertificateValidator

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path...

OESA-2026-3118 gnutls security update

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface API to access the secure communications protocols as well as APIs to parse and write X.509, PKCS 12, and other...

SUSE CVE-2026-56820

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and prior to 4.1.135.Final, OcspClient does not validate that the CertificateID in an OCSP response matches the requested CertificateID, which can lead to replay...

Improper Certificate Validation

Overview io.netty:netty-handler-ssl-ocsp is a Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. Affected versions of this package are vulnerable to Improper Certificate Validation in the...

The vulnerability of the OCSP protocol implementation in the Apache HTTP Server allows a perpetrator to induce a service failure.

The vulnerability of the OCSP protocol implementation in the Apache HTTP Server is related to reading data beyond the permitted range of memory. Exploiting this vulnerability could allow a malicious actor to cause service interruptions...

Apache Tomcat: Apache Tomcat: Authentication bypass via client certificate misconfiguration

A flaw was found in Apache Tomcat where OCSP-based certificate validation may incorrectly soft-fail during CLIENTCERT authentication, even when soft-fail is disabled, under certain FFM-related execution paths. This can result in client certificates being accepted despite failed or unverifiable...

httpd: Apache HTTP Server: Buffer Over-read via outbound OCSP requests to attacker-controlled server

A flaw was found in Apache HTTP Server. This buffer over-read vulnerability occurs when the server processes outbound Online Certificate Status Protocol OCSP requests directed to an attacker-controlled OCSP server. This could allow a remote attacker to read sensitive information from memory or...

httpd: mod_md: unrestricted OCSP response leads to resource exhaustion

A flaw was found in the modmd module of httpd. When processing OCSP Online Certificate Status Protocol responses from a malicious or compromised OCSP responder, the module fails to enforce proper size limits on the incoming data. This issue leads to memory exhaustion and a denial of service...

ALSA-2026:30845 Moderate: mod_md security update

This module manages common properties of domains for one or more virtual hosts. Specifically it can use the ACME protocol to automate certificate provisioning. Certificates will be configured for managed domains and their virtual hosts automatically, including at renewal. Security Fixes: httpd:...

CVE-2026-10098

OCSP CertID serial-number length-confusion in wolfSSLOCSPrespfindstatus allows a same-issuer SingleResponse whose serial is a prefix of the target serial to be reported as the revocation status of a different certificate. The lookup compared serial-number bytes without first requiring the two...

CVE-2026-10098 OCSP CertID serial-number length-confusion in wolfSSL_OCSP_resp_find_status

OCSP CertID serial-number length-confusion in wolfSSLOCSPrespfindstatus allows a same-issuer SingleResponse whose serial is a prefix of the target serial to be reported as the revocation status of a different certificate. The lookup compared serial-number bytes without first requiring the two...

CVE-2026-10098

OCSP CertID serial-number length-confusion in wolfSSLOCSPrespfindstatus allows a same-issuer SingleResponse whose serial is a prefix of the target serial to be reported as the revocation status of a different certificate. The lookup compared serial-number bytes without first requiring the two...

RLSA-2026:26323 Important: tomcat security update

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages JSP technologies. Security Fixes: tomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation CVE-2026-24734 For more details about the security issues, including the impact, a CVSS...

Important: Red Hat Security Advisory: tomcat security update

An update for tomcat is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from th...

ALSA-2026:25341 Important: tomcat9 update

Certificate revocation bypass due to improper OCSP response validation...

SUSE CVE-2026-44185

Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled OCSP server This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue...

NULL Pointer Dereference

Overview Affected versions of this package are vulnerable to NULL Pointer Dereference during OCSP response checking. When a verification chain lacks a self-signed trusted anchor, the issuer of the last certificate is NULL, but the OCSP code accesses the next certificate as the issuer, dereferenci...