UpHeron
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Servers and applications

CVE-2026-84783

Issue summary: The first concurrent use of the same X.509 certificate by several threads may cause its cached extension data to be freed while another thread is still using it. Impact summary: A remote, unauthenticated peer could crash a multi-threaded TLS client, or a multi-threaded TLS server that requests client certificates, if the first certificate chains built to the same trusted CA…

Severity
High 7.5
Published
29 Sept 2026
Last changed
8 Oct 2026
Added to UpHeron
21 Oct 2026
Fixed in
4.0.3
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • From 4.0.0 before 4.0.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-84783
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-84783