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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | amphp/http-client | >= 4.0.0-rc10, < 4.1.0-rc1 | 4.1.0-rc1 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H- Weakness (CWE)
CWE-770, CWE-789- Platform
- Composer
- Package
amphp/http-client- Disclosed
- 03.04.2024
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-w8gf-g2vq-j2f4 - CC BY 4.0
Vulnerability history: amphp/http-client
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 04.2024 05.2024
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 1
Disclosures per year
- 2024: 3
- 2025: 0
- 2026: 0
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amphp/http-client Denial of Service via HTTP/2 CONTINUATION Frames this entry
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