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OpenSSL vulnerabilities

The OpenSSL cryptography library and its distribution packages. 808 published CVES affecting OpenSSL, from public sources (CVE.org, NVD, CISA KEV, FIRST EPSS, OSV).

Total
808
Critical
71
High
294
Medium
282
Low
36
Unscored
125
CISA KEV
1
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Latest OpenSSL CVEs

Newest publication first · page 2 of 33

  1. MediumCVSS 6.5 EPSS 0.24%

    boks_ksllogsd accepts a checksum algorithm name in the MD field of an authenticated KSL start message. Affected releases verify that OpenSSL recognizes the digest name but do not verify that the value fits in a fixed 16-byte checksum context field before copying it. An authentica...

  2. HighCVSS 7.5 EPSS 0.61%

    Issue summary: A malicious remote peer may flood the local QUIC stack with NEW_CONNECTION_ID frames by avoiding a limit check on how many connection IDs the remote QUIC stack can use. Impact summary: The local QUIC stack sends a RETIRE_CONN_ID frame for every NEW_CONNECTION_ID fr...

  3. HighCVSS 7.5 EPSS 0.29%

    Issue summary: The first concurrent use of the same X.509 certificate by several threads may cause its cached extension data to be freed while another thread is still using it. Impact summary: A remote, unauthenticated peer could crash a multi-threaded TLS client, or a multi-thre...

  4. HighCVSS 8.2 EPSS 0.91%

    Issue summary: The DTLS retransmission logic does not correctly handle a handshake message write that is suspended part-way through. The retransmitted message can be read past the message buffer and the retransmission overwrites the internal state the suspended write needs to res...

  5. LowCVSS 3.7 EPSS 0.44%

    Issue summary: SM2 signature generation uses non-constant-time arithmetic on secret values, forming a timing side-channel. Impact summary: An attacker able to measure SM2 signing times may learn information about the per-signature secret nonce, which over many signatures can, via...

  6. MediumCVSS 5.3 EPSS 1.2%

    Issue summary: An established DTLS 1.2 association using an AEAD cipher suite can be terminated by a single unauthenticated datagram whose encrypted fragment is shorter than the mandatory explicit IV and authentication tag overhead. Impact summary: An attacker who can send a data...

  7. MediumCVSS 5.3 EPSS 0.53%

    Issue summary: OpenSSL QUIC stack does not enforce connection level flow control for streams. Remote peers may send more bytes as long as they fit within the stream flow control limits. Impact summary: A malicious remote peer may exploit the lack of connection flow control for st...

  8. HighCVSS 7.5 EPSS 0.39%

    Issue summary: A TLS server that calls SSL_set_SSL_CTX() to switch a connection to a different SSL_CTX part way through a handshake may access memory beyond the end of an internal array if the replacement context knows about more provider signature algorithms than the context the...

  9. LowCVSS 3.7 EPSS 0.48%

    Issue summary: A non-constant-time optimized implementation of scalar point multiplication is used for SM2 private key operations on ARM64 and RISC-V platforms. Impact summary: An attacker able to measure the time taken by, or to observe the cache-line access pattern of SM2 signi...

  10. HighCVSS 7.5 EPSS 0.72%

    Issue summary: QUIC process may keep memory for QUIC packet buffer for much longer period than necessary. Impact summary: Remote peer can exploit this vulnerability by sending maliciously crafted packets, making the local QUIC stack to keep the memory for packet buffers allocated...

  11. MediumCVSS 5.3 EPSS 0.50%

    Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data. Impact summary:...

  12. LowCVSS 3.7 EPSS 0.72%

    Issue summary: The OpenSSL QUIC server, when configured to not preform address validation, can be forced to count incoming packets multiple times in its unvalidated credit computation, leading to a violation of the RFC 9000 unvalidated connection amplification limit of 3 times th...

  13. MediumCVSS 5.3 EPSS 0.35%

    Issue summary: A certificate with many nameRelativeToCRLIssuer CRL distribution points causes disproportionate heap growth when OpenSSL caches X.509 extensions. Impact summary: Receiving a crafted certificate from a malicious peer can lead to significant memory pressure and possi...

  14. MediumCVSS 4.3 EPSS 0.16%

    PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-m...

  15. HighCVSS 8.7

    A flaw was found in Red Hat Ansible Automation Platform's automation- controller. The AWX_TASK_ENV setting accepts arbitrary environment variable keys with no restriction, and its values are applied directly to the running automation controller web and task processes rather than...

  16. CriticalCVSS 9.1 EPSS 0.35%

    Initialization of a resource with an insecure default vulnerability in Apache Tomcat Native enabled insecure options by default including ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF and ALLOW_NO_DHE_KEX. This issue affects Apache Tomcat Native: fr...

  17. CVE-2026-89281 CVE-2026-89281

    Published
    HighCVSS 8.4 EPSS 0.18%

    The Apache Lounge Windows distribution of Apache HTTP Server build contains a hardcoded configuration path vulnerability within openssl.cnf path that can allow local code execution.

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.