CVE-2026-63573

Observable discrepancy in the CMS RSA PKCS1 v1.5 key-transport unwrap KeyTransRecipientInformation.UnwrapKey in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who holds a captured CMS EnvelopedData message, and who can submit many modified messages to an...

CVE-2026-63573

A Bleichenbacher-style adaptive chosen-ciphertext attack exists in Legion of the Bouncy Castle Inc. bc-csharp versions before 2.7.0 . The vulnerability is located in the CMS RSA PKCS#1 v1.5 key-transport unwrap (KeyTransRecipientInformation.UnwrapKey) component. Because the system rejects ciphert...

EUVD-2026-91224

Observable discrepancy in the CMS RSA PKCS1 v1.5 key-transport unwrap KeyTransRecipientInformation.UnwrapKey in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who holds a captured CMS EnvelopedData message, and who can submit many modified messages to an...

CVE-2026-63573 Bleichenbacher padding oracle in CMS RSA PKCS#1 v1.5 key-transport unwrap

Observable discrepancy in the CMS RSA PKCS1 v1.5 key-transport unwrap KeyTransRecipientInformation.UnwrapKey in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who holds a captured CMS EnvelopedData message, and who can submit many modified messages to an...

PT-2026-104132

Observable discrepancy in the CMS RSA PKCS1 v1.5 key-transport unwrap KeyTransRecipientInformation.UnwrapKey in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who holds a captured CMS EnvelopedData message, and who can submit many modified messages to an...

AlmaLinux 9.6 [TuxCare] Security Update: libreswan Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1784305067)

The AlmaLinux 9.6 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1784305067 advisory. - Libreswan, via the function RSAauthenticatehashsignaturerawrsa, did not correctly verify the length of the authentication hash whe...

AlmaLinux 9.2 [TuxCare] Security Update: libgcrypt / libgcrypt-devel (ALMALINUX9.2:CLSA-2025:1737656427)

The AlmaLinux 9.2 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2025:1737656427 advisory. - A timing-based side-channel flaw was found in libgcrypt's RSA implementation. This issue may allow a remote attacker to initiate a...

Rocky Linux 9 [CIQ] Security Update: nodejs-nodemon / nodejs-packaging / nodejs-packaging-bundler Multiple Vulnerabilities (crlsa-2024_1503)

The Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-20241503 advisory. nodejs: code injection and privilege escalation through Linux capabilities CVE-2024-21892 nodejs: reading unprocessed HTTP request with unbounded chunk...

librenswan: IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload

A flaw was found in Libreswan's implementation of IKEv1 authentication via raw RSA signatures. When processing an IKEv1 packet using PKCS 1 v1.5 RSA encryption, the RSAauthenticatehashsignaturerawrsa function fails to properly validate the length of the authentication hash. A remote,...

Security Bulletin: QRadar App SDK for IBM QRadar SIEM contains components with known vulnerabilities

Summary The product includes vulnerable components e.g., framework libraries that could be identified and exploited with automated tools. Investigation Assistant App for IBM QRadar App SDK has addressed the applicable CVEs in an update. Vulnerability Details CVEID:CVE-2026-69247 DESCRIPTION:...

EulerOS Virtualization 2.11.0 : shim (EulerOS-SA-2026-3560)

According to the versions of the shim package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext acros...

EulerOS Virtualization 2.11.1 : shim (EulerOS-SA-2026-3473)

According to the versions of the shim packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext acro...

Security Bulletin: IBM SOAR QRadar Plugin App is vulnerable to using components with known vulnerabilities (CVE-2026-69247, CVE-2026-69248, CVE-2026-69249)

Summary The product includes vulnerable components e.g., framework libraries that may be identified and exploited with automated tools. IBM SOAR QRadar Plugin App has addressed the applicable CVEs with an update. Vulnerability Details CVEID:CVE-2026-69247 DESCRIPTION: cryptography is a package...

Security Bulletin: IBM Watson Discovery for IBM Cloud Pak for Data affected by vulnerability in cryptography

Summary IBM Watson Discovery for IBM Cloud Pak for Data affected by vulnerability in cryptography Vulnerability Details CVEID:CVE-2026-69247 DESCRIPTION: cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 44.0.0 until 50.0.0,...

openssl: Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt()

A flaw was found in OpenSSL's CMSdecrypt and PKCS7decrypt functions. This vulnerability, a Bleichenbacher-style oracle, could allow a remote attacker to decrypt or sign messages using the victim's private RSA key. Exploitation requires the attacker to provide specially crafted CMS or S/MIME...

Astra Linux – Vulnerability in OpenSSL

There exists a timing-based side channel in the OpenSSL RSA Decryption implementation. This vulnerability could be sufficient for an attacker to recover plaintext across a network in a Bleichenbacher-style attack. To successfully decrypt data, an attacker would need to be able to send a very larg...

Astra Linux – Vulnerability in gnutls28

A timing side-channel vulnerability in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be used to recover the key encrypted in the RSA ciphertext across a network, in a Bleichenbacher-style attack. To successfully decrypt the data, the attacker would...

Astra Linux – Vulnerability in nss

The NSS code used for checking PKCS1 v1.5 was leaking information useful for launching Bleichenbacher-style attacks. Both the overall correctness of the padding and the length of the encrypted message were exposed through timing side-channels. By sending a large number of ciphertexts selected by...

Astra Linux – Vulnerability in python-cryptography

Python-Cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, due to timed processing of valid PKCS1 v1.5 ciphertext...

SUSE CVE-2026-33894

Forge also called node-forge is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, RSASSA PKCS1 v1.5 signature verification accepts forged signatures for low public exponent keys e=3. Attackers can forge signatures by stuffing “garbage” bytes within the ASN...