UpHeron
All vulnerabilities

Servers and applications

CVE-2019-15226

Upon receiving each incoming request header data, Envoy will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in versions 1.10.0 through 1.11.1 for HTTP/1.x traffic and all versions of Envoy for HTTP/2 traffic had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum…

Severity
High 7.5
Published
9 Oct 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
65% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
EnvoyServers and applications · cpe:a:envoyproxy:envoy
  • Version 1.11.2
  • Version 1.11.1
  • Version 1.11.0
  • Version 1.10.0
All 16 release lines
  • Version 1.0.0
  • Version 1.1.0
  • Version 1.2.0
  • Version 1.3.0
  • Version 1.4.0
  • Version 1.5.0
  • Version 1.6.0
  • Version 1.7.0
  • Version 1.7.1
  • Version 1.8.0
  • Version 1.9.0
  • Version 1.9.1
  • Version 1.10.0
  • Version 1.11.0
  • Version 1.11.1
  • Version 1.11.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-15226
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-15226