HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server. Version from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.3 are affected. Users can set a new setting (proxy.config.http2.max_continuation_frames_per_minute) to limit the number of CONTINUATION frames per minute. ATS does have a fixed amount of memory a request can use and ATS adheres to these limits in previous releases. Users are recommended to upgrade to versions 8.1.10 or 9.2.4 which fixes the issue.
https://nowotarski.info/http2-continuation-flood/
https://kb.cert.org/vuls/id/421644
https://lists.debian.org/debian-lts-announce/2024/04/msg00021.html
https://lists.apache.org/thread/f9qh3g3jvy153wh82pz4onrfj1wh13kc