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Servers and applications

CVE-2025-66199

Issue summary: A TLS 1.3 connection using certificate compression can be forced to allocate a large buffer before decompression without checking against the configured certificate size limit. Impact summary: An attacker can cause per-connection memory allocations of up to approximately 22 MiB and extra CPU work, potentially leading to service degradation or resource exhaustion (Denial of…

Severity
Medium 5.9
Published
27 Jan 2026
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
3.3.6, 3.4.4, 3.5.5, 3.6.1
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • From 3.3.0 before 3.3.6
  • From 3.4.0 before 3.4.4
  • From 3.5.0 before 3.5.5
  • From 3.6.0 before 3.6.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-66199
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-66199