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GHSA-w8gf-g2vq-j2f4

GHSA-w8gf-g2vq-j2f4: amphp/http-client Denial of Service via HTTP/2 CONTINUATION Frames

Early versions of amphp/http-client with HTTP/2 support (v4.0.0-rc10 to 4.0.0) will collect HTTP/2 CONTINUATION frames in an unbounded buffer and will not check the header size limit until it has received the END_HEADERS flag, resulting in an OOM crash. Later versions of amphp/http-client (v4.1.0-rc1 and up) depend on amphp/http for HTTP/2 processing and will therefore need an updated version of amphp/http, see GHSA-qjfw-cvjf-f4fm.

Acknowledgements

Thank you to Bartek Nowotarski for reporting the vulnerability.

(GitHub Advisory)

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GHSA-w8gf-g2vq-j2f4

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
amphp/http-client	composer	>= 4.0.0-rc10, <= 4.0.0	4.1.0-rc1

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Root Cause Analysis

The vulnerability stems from improper handling of HTTP/2 CONTINUATION frames in affected amphp/http-client versions. The advisory explicitly states that CONTINUATION frames are buffered without size checks until END_HEADERS is received. The HTTP/2 connection handler (Http2Connection) is responsible for frame processing. The handleHeaders method (or equivalent) would logically process header-related frames, including CONTINUATION, and manage the buffer. The lack of incremental size validation during frame accumulation matches the described vulnerability mechanism. While exact function names aren't explicitly provided in advisories, the HTTP/2 connection handling code is the clear candidate based on the vulnerability's nature and HTTP/2 protocol specifics.

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WAF Rule

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Reasoning

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GHSA-w8gf-g2vq-j2f4: amphp/http-client Denial of Service via HTTP/2 CONTINUATION Frames

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GHSA-w8gf-g2vq-j2f4:

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GHSA-w8gf-g2vq-j2f4: amphp/http-client Denial of Service via HTTP/2 CONTINUATION Frames

Acknowledgements

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