| Package | Affected versions | Patched versions |
|---|---|---|
| envoy | = 1.0.0= 1.1.0= 1.10.0= 1.11.0= 1.11.1= 1.11.2= 1.2.0= 1.3.0= 1.4.0= 1.5.0= 1.6.0= 1.7.0= 1.7.1= 1.8.0= 1.9.0= 1.9.1 |
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.
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