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Servers and applications

CVE-2026-63075

Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly sends ack-eliciting packets while not acknowledging ACK-only responses, the QUIC stack can retain ACK-only packet metadata for the lifetime of the connection. Impact summary: A remote peer that can complete a QUIC handshake can cause connection-scoped memory growth which may lead to Denial of Service through memory…

Severity
High 7.5
Published
25 Aug 2026
Last changed
11 Sept 2026
Added to UpHeron
21 Oct 2026
Fixed in
3.4.7, 3.5.8, 3.6.4, 4.0.2
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • From 3.4.0 before 3.4.7
  • From 3.5.0 before 3.5.8
  • From 3.6.0 before 3.6.4
  • From 4.0.0 before 4.0.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-63075
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-63075