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High severity7.5NVD Advisory· Published Oct 9, 2019· Updated Jun 17, 2026

CVE-2019-15226

CVE-2019-15226

Description

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 request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

18
  • Envoyproxy/Envoy17 versions
    cpe:2.3:a:envoyproxy:envoy:1.0.0:*:*:*:*:*:*:*+ 16 more
    • cpe:2.3:a:envoyproxy:envoy:1.0.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.1.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.10.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.11.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.11.1:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.11.2:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.2.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.3.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.4.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.5.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.6.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.7.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.7.1:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.8.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.9.0:*:*:*:*:*:*:*
    • cpe:2.3:a:envoyproxy:envoy:1.9.1:*:*:*:*:*:*:*
    • (no CPE)range: 1.10.0 - 1.11.1 (HTTP/1.x traffic), all versions (HTTP/2 traffic)
  • Envoy/Envoydescription

Patches

Vulnerability mechanics

References

3

News mentions

0

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