Allocation of Resources Without Limits or Throttling in OpenSSL - CVE-2026-34183
Published: June 10, 2026
Vulnerability identifier: #VU134272
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-34183
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenSSL Software Foundation
Affected software:
OpenSSL
OpenSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled memory allocation in the QUIC PATH_CHALLENGE handler when processing floods of PATH_CHALLENGE frames. A remote attacker can send a flood of PATH_CHALLENGE frames to cause a denial of service.
The issue affects applications acting as a QUIC client or server.
How to mitigate CVE-2026-34183
Install security update from vendor's website.