CVE-2026-45388

In OCaml-TLS before 2.1.0, the client implementation does insufficient checks of the certificate provided by the server, which allows impersonation with certificates that are not meant for server authentication because of KeyUsage and ExtendedKeyUsage...

CVE-2026-45389

In OCaml-TLS before 2.1.0, the server implementation does insufficient checks of the certificate provided by the client when doing client authentication, which allows impersonation with certificates that are not meant for client authentication because of KeyUsage and ExtendedKeyUsage...

CVE-2026-45388

CVE-2026-45388 affects OCaml-TLS before 2.1.0. The TLS 1.3 client path in handshake_client13.ml did not wire into validate_keyusage, allowing a certificate issued for non-server purposes (e.g., clientAuth, codeSigning, emailProtection) to impersonate a TLS server if the EKU/KeyUsage restrictions ...

OSEC-2026-06 TLS-client (with TLS 1.3) does insufficient certificate checks (missing KeyUsage and ExtendedKeyUsage validation)

The ocaml-TLS 1.3 client does not validate the KeyUsage and ExtendedKeyUsage extensions of the server certificate. This can lead to impersonation with a certificate issued to a client. Scenario Every employee at a major bank carries a smart card. The card holds a clientAuth certificate issued by...

USN-8284-1: GnuTLS vulnerabilities

Joshua Rogers discovered that GnuTLS did not properly handle malformed DTLS handshake fragments in certain cases. A remote attacker could possibly use this issue to obtain sensitive information, or cause a denial of service. CVE-2026-33845 Haruto Kimura, Oscar Reparaz, and Zou Dikai discovered th...

Astra Linux - уязвимость в curl

Curl versions 7.63.0 through 7.75.0 include a vulnerability that allows a malicious HTTPS proxy to intercept connections by mishandling TLS 1.3 session tickets. When using an HTTPS proxy and TLS 1.3, libcurl may misinterpret session tickets sent from the HTTPS proxy as those coming from the remot...

Astra Linux - уязвимость в curl

There is a vulnerability in the handling of certificate validation in curl v8.1.0, particularly in how wildcard patterns are matched when listed as “Subject Alternative Name” in TLS server certificates. Curls can be modified to use its own name matching function for TLS, rather than the one...

CVE-2026-42193 Plunk: SNS webhook forgery

Plunk is an open-source email platform built on top of AWS SES. Prior to version 0.9.0, the /webhooks/sns endpoint accepts Amazon SNS notification payloads from unauthenticated requests without verifying the SNS signature, certificate, or topic ARN, meaning anyone can forge a valid-looking webhoo...

Astra Linux – Vulnerability in libgit2

libgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Previous versions of libgit2 required the caller to set the certificatecheck field of the libgit2’s...

Astra Linux – Vulnerability in openconnect

OpenConnect through version 8.08 mishandles negative return values from X509check function calls, which may assist attackers in performing man-in-the-middle attacks...

Astra Linux – Vulnerability in Firefox and Thunderbird

If a PAC URL was set, and the server hosting the PAC was unreachable, OCSP requests would be blocked, resulting in incorrect error pages being displayed. This vulnerability affects Firefox 102, Firefox ESR 91.11, Thunderbird 102, and Thunderbird 91.11...

CLSA-2026-1777393695 java-11-openjdk: Fix of 6 CVEs

Upgrade to openjdk-11.0.30+7 GA. The following CVEs were fixed: - CVE-2026-21945: enhance certificate checking - CVE-2026-21932: enhance handling of URIs - CVE-2026-21933: improve HttpServer request handling - CVE-2026-21925: improve JMX connections - CVE-2025-64720: update libpng to 1.6.51 -...

JLSEC-2026-236 Applications that use a non-default option when verifying certificates may be vulnerable to an...

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that...

CLSA-2026-1775779143 java-11-openjdk: Fix of 5 CVEs

Upgrade to openjdk-11.0.30+7 GA. The following CVEs were fixed: - CVE-2026-21945: enhance Certificate Checking - CVE-2026-21933: improve HttpServer Request handling - CVE-2026-21925: improve JMX connections - CVE-2025-65018: fix LIBPNG heap buffer overflow - CVE-2025-64720: fix LIBPNG buffer...

GO-2026-4866 Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509

When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the...

Juju has Improper TLS Client/Server authentication and certificate verification on Database Cluster

Impact Any Juju controller since 3.2.0. An attacker with only route-ability to the target juju controller Dqlite cluster endpoint may join the Dqlite cluster, read and modify all information, including escalating privileges, open firewall ports etc. This is due to not checking the client...

CVE-2025-15612

Wazuh provisioning scripts and Dockerfiles contain an insecure transport vulnerability where curl is invoked with the -k/--insecure flag, disabling SSL/TLS certificate validation. Attackers with network access can perform man-in-the-middle attacks to intercept and modify downloaded dependencies o...

Important: Red Hat Security Advisory: java-1.8.0-ibm security update

An update for java-1.8.0-ibm is now available for Red Hat Enterprise Linux 8. 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...

Veeam Operations Fail When the Backup Server Has Limited Internet Access

Article Applicability This article addresses an issue that may occur when using a Windows-based deployment of Veeam Backup & Replication v13, where the Veeam Backup Server or other Windows-based component servers are isolated from the internet or subject to significant firewall restrictions...

CLSA-2026-1770310846 java-1.8.0-openjdk: Fix of 3 CVEs

Upgrade to shenandoah-jdk8u482-b08 GA fixing the following CVE: - CVE-2026-21945: enhance certificate checking - CVE-2026-21925: improve JMX connections - CVE-2026-21933: improve HttpServer request handling...