CVE-2026-42764

HIGH EPSS 47.9%
Published Jun 9, 20262w ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Jun 9, 2026 2w ago
Last Modified Jun 17, 2026 1w ago

Description

Issue summary: Receiving a QUIC initial packet with an invalid token may trigger a NULL pointer dereference in the OpenSSL QUIC server with address validation disabled. Impact summary: NULL pointer dereference typically causes abnormal termination of the affected QUIC server process and a Denial of Service. If the address validation is disabled in the OpenSSL QUIC server implementation, an attacker can crash the server by sending an initial packet with an invalid or expired token. By default, the client address validation is enabled in the OpenSSL QUIC server implementation, which makes the default configuration not vulnerable to this issue. However if the SSL_LISTENER_FLAG_NO_VALIDATE is used with the SSL_new_listener() call, the address validation is disabled making the vulnerable code reachable. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
47.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 3

VendorProductVersionRange
opensslopenssl*≥3.5.0  –  <3.5.7
opensslopenssl*≥3.6.0  –  <3.6.3
opensslopenssl4.0.0any

References 4

  • github.com https://github.com/openssl/openssl/commit/5e3ed291b8af0b03d5d3b9e56a1da69a187e9729
    Patch
  • github.com https://github.com/openssl/openssl/commit/a45a0aba8095682c88ff4fc4a784892b8c6f0677
    Patch
  • github.com https://github.com/openssl/openssl/commit/bf29a458c1a231eca87e384c62b9c2553fa57a91
    Patch
  • openssl-library.org https://openssl-library.org/news/secadv/20260609.txt
    Vendor Advisory

Remediation

  • github.com https://github.com/openssl/openssl/commit/5e3ed291b8af0b03d5d3b9e56a1da69a187e9729
    Patch
  • github.com https://github.com/openssl/openssl/commit/a45a0aba8095682c88ff4fc4a784892b8c6f0677
    Patch
  • github.com https://github.com/openssl/openssl/commit/bf29a458c1a231eca87e384c62b9c2553fa57a91
    Patch