CVE-2026-34183

Summary

Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames.

Impact summary: A malicious remote peer can cause an unbounded memory allocation which can lead to an abnormal termination of the application acting as a QUIC client or server and a Denial of Service.

A remote peer may exhaust heap memory by flooding the local QUIC stack with PATH_CHALLENGE frames. The local QUIC stack allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives. The allocated PATH_RESPONSE frame gets freed only when the remote peer acknowledges reception of the PATH_RESPONSE frame which will not be done by a malicious peer.

The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue. The QUIC stack is outside of OpenSSL FIPS module boundary.

Affected Software

VendorProductVersion RangeStatus
OpenSSLOpenSSL4.0.0 < 4.0.1affected
OpenSSLOpenSSL3.6.0 < 3.6.3affected
OpenSSLOpenSSL3.5.0 < 3.5.7affected
OpenSSLOpenSSL3.4.0 < 3.4.6affected

Weaknesses

  • CWE-1325: CWE-1325 Improperly Controlled Sequential Memory Allocation

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References