CVE-2026-110310

A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS1 v1.5 padding...

CVE-2026-110310 RSA PKCS#1 v1.5 padding oracle via legacy envelope key format downgrade in Amazon S3 Encryption Client for .NET

A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS1 v1.5 padding...

PT-2026-114031

Name of the Vulnerable Software and Affected Versions S3 .NET Encryption Client versions prior to 3.2.2 S3 .NET Encryption Client versions prior to 4.0.3 Description A padding oracle flaw exists in the S3 .NET Encryption Client. A remote user with read access to encrypted objects in an S3 bucket...

MikroTik RouterOS Improper Verification of Cryptographic Signature (CVE-2026-67278)

MikroTik RouterOS accepts malformed RSA/PKCS1 v1.5 signatures across RSA-based services, including TLS/X.509 certificate validation and SSH host-key authentication. Because its trust store includes an e=3 root CA, an attacker controlling or redirecting an outbound RouterOS TLS connection can use...

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...

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...

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...

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...

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...

CVE-2026-63573: Observable Discrepancy

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...

Rocky Linux 9 [CIQ] Security Update: opensc / opensc-debuginfo / opensc-debugsource (crlsa-2024_0966)

The Rocky Linux 9 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-20240966 advisory. OpenSC: Side-channel leaks while stripping encryption PKCS1 padding CVE-2023-5992 Tenable has extracted the preceding description block directly from the CIQ securi...

Rocky Linux 8 [CIQ] Security Update: opensc / opensc-debuginfo / opensc-debugsource (crlsa-2024_0967)

The Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-20240967 advisory. OpenSC: Side-channel leaks while stripping encryption PKCS1 padding CVE-2023-5992 Tenable has extracted the preceding description block directly from the CIQ securi...

Rocky Linux 8 [CIQ] Security Update: opencryptoki / opencryptoki-debuginfo / opencryptoki-debugsource / etc (crlsa-2024_1608)

The Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-20241608 advisory. opencryptoki: timing side-channel in handling of RSA PKCS1 v1.5 padded ciphertexts Marvin CVE-2024-0914 Tenable has extracted the preceding description block direct...

AlmaLinux 9.2 [TuxCare] Security Update: opencryptoki / opencryptoki-devel / opencryptoki-icsftok / etc (ALMALINUX9.2:CLSA-2026:1784542737)

The AlmaLinux 9.2 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1784542737 advisory. - A timing side-channel vulnerability has been discovered in the opencryptoki package while processing RSA PKCS1 v1.5 padded ciphertexts. Thi...

CentOS Linux 7 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils Multiple Vulnerabilities (CENTOS7:CLSA-2024:1710184399)

The CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS7:CLSA-2024:1710184399 advisory. - A Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS1...

TencentOS Server 4: libreswan (TSSA-2026:1060)

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:1060 advisory. Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:...

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,...

org.bouncycastle/bc-java: org.bouncycastle/bc-lts-java: Bouncy Castle for Java: Cryptographic signature bypass in RSA PKCS#1 verification

A flaw was found in Bouncy Castle for Java. During the RSA PKCS1 verification process, the last two hash bytes are incorrectly skipped when a NULL-omitted path is utilized. This vulnerability could allow an attacker to bypass cryptographic signature verification, potentially leading to the...