PT-2026-47834 · Openssl · Openssl

Hyuk Lim + 2 · Published 2026-06-09 · Updated 2026-06-09 · CVE-2026-42764

Mitre

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-42764

Affected Products

Openssl

References · 5

• ❌ https://github.com/openssl/security/commit/5e3ed291b8af0b03d5d3b9e56a1da69a187e9729 · Patch, Deleted
• ❌ https://github.com/openssl/security/commit/bf29a458c1a231eca87e384c62b9c2553fa57a91 · Patch, Deleted
• https://openssl-library.org/news/secadv/20260609.txt · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42764 · Security Note
• ❌ https://github.com/openssl/security/commit/a45a0aba8095682c88ff4fc4a784892b8c6f0677 · Patch, Deleted