USN-8847-2: OpenSSL vulnerabilities

USN-8847-1 fixed vulnerabilities in OpenSSL. This update provides the corresponding fix for OpenSSL on Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. Original advisory details: It was discovered that OpenSSL incorrectly handled certain certificate revocation list...

Security Bulletin: IBM i is Affected By Multiple Vulnerabilities in OpenSSL

Summary IBM i is vulnerable to multiple vulnerabilites CVE-2026-54874, CVE-2026-63072, CVE-2026-63074, CVE-2026-63076, CVE-2026-75803 in OpenSSL as described in the vulnerability details section. Vulnerability Details CVEID:CVE-2026-54874 DESCRIPTION: Issue summary: Receiving a DTLS record for a...

USN-8847-1 openssl vulnerabilities

It was discovered that OpenSSL incorrectly handled certain certificate revocation list distribution point names. An attacker could possibly use this issue to cause OpenSSL to consume excessive memory, resulting in a denial of service. CVE-2026-35189 It was discovered that OpenSSL incorrectly...

USN-8847-1: OpenSSL vulnerabilities

It was discovered that OpenSSL incorrectly handled certain certificate revocation list distribution point names. An attacker could possibly use this issue to cause OpenSSL to consume excessive memory, resulting in a denial of service. CVE-2026-35189 It was discovered that OpenSSL incorrectly...

CVE-2026-35191

A flaw was found in OpenSSL. This vulnerability allows a remote attacker to abuse the server to amplify network traffic in a Denial of Service DoS attack. When the server is configured without client address validation, incoming datagrams containing multiple QUIC packets cause the server to...

CVE-2026-35189

A flaw was found in OpenSSL. A remote attacker can cause a Denial of Service DoS by presenting a specially crafted certificate during a Transport Layer Security TLS handshake. When OpenSSL processes and caches certificate extensions containing numerous Certificate Revocation List CRL distribution...

CVE-2026-77696

A flaw was found in OpenSSL. During SM2 signature generation, variable-time arithmetic operations are performed on secret values, creating an observable timing side-channel. An attacker capable of measuring signature generation times can collect timing data across multiple signing operations, whi...

CVE-2026-84784

A flaw was found in OpenSSL. A remote attacker can cause a Denial of Service DoS by flooding a connection with connection identifier update requests while withholding acknowledgments. This behavior bypasses connection limits and forces the system to accumulate pending retirement frames, resulting...

CVE-2026-84783

A flaw was found in OpenSSL. A remote, unauthenticated attacker can cause a Denial of Service DoS by initiating concurrent connections to a multi-threaded Transport Layer Security TLS client or server verifying certificates. Due to improper synchronization when multiple threads simultaneously...

CVE-2026-75806

A flaw was found in OpenSSL. A remote, unauthenticated attacker can cause a Denial of Service DoS by terminating an active Datagram Transport Layer Security DTLS session. By sending an undersized network packet that is shorter than the expected cryptographic overhead, the record processing layer...

CVE-2026-54875

A flaw was found in OpenSSL. The optimized scalar point multiplication used for SM2 cryptographic operations on ARM64 and RISC-V architectures does not execute in constant time. An attacker capable of measuring execution times or observing processor cache-access patterns can exploit this side...

CVE-2026-75805

A flaw was found in OpenSSL. When a Certificate Management Protocol CMP client requests certificate revocation using a PKCS10 Certificate Signing Request CSR, it omits the certificate issuer name and serial number. A malicious or compromised CMP server, or an attacker possessing valid message...

CVE-2026-72897

A flaw was found in openssl. When a server replaces its security context during an active Transport Layer Security TLS handshake, it fails to update the internal capacity tracking for cryptographic signature algorithms. A remote peer can exploit this issue by advertising specific signature...

CVE-2026-54873

A flaw was found in OpenSSL. A remote attacker can cause a Denial of Service DoS by sending specially crafted network packets to a QUIC protocol endpoint. Because the QUIC stack retains memory in packet buffers until the receiving application reads the stream data, an attacker can manipulate data...

CVE-2026-54872

A flaw was found in OpenSSL. A timing side-channel vulnerability in generic elliptic curve scalar multiplication allows an attacker to recover private cryptographic keys. When performing signature operations, such as the Elliptic Curve Digital Signature Algorithm ECDSA or SM2, using curves withou...

CVE-2026-42772

A flaw was found in OpenSSL. A remote attacker who establishes a QUIC network connection can cause a Denial of Service DoS by sending specially sequenced, out-of-order stream frames. Because the stream reassembly mechanism handles non-sequential data fragments inefficiently, processing these fram...

CVE-2026-75804

A flaw was found in OpenSSL. A remote attacker can cause a Denial of Service DoS due to missing connection-level flow control enforcement in the QUIC protocol implementation. By opening multiple streams that respect individual stream limits while preventing data consumption, the attacker can forc...

Timing Attack

Overview Affected versions of this package are vulnerable to Timing Attack in the ARM64 and RISC-V optimized SM2 scalar multiplication, which selects conditional branches and table lookups by secret scalar bits. An attacker can learn the long term private key or a per signature nonce by measuring...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the X.509 extension caching of CRL distribution points, which expands each nameRelativeToCRLIssuer entry into heap structures disproportionate to its encoded size. An attacker can...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the QUIC receive path, which holds a reference to the packet buffer until the application reads the stream data out of it. An attacker can hold that memory allocated for as long as...