CVE-2026-54873 OpenSSL QUIC - Allocation of Resources Without Limits or Throttling

OpenSSL QUIC stack contains an allocation of resources without limits or throttling caused by delayed release of packet buffers, letting remote attackers exhaust memory by sending crafted packets, exploit requires network access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.46% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Allocation of Resources Without Limits or Throttling
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to the latest OpenSSL version with the QUIC stack memory overhead mitigation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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