CVE-2024-2653
HighAMPHP Denial of Service via HTTP/2 CONTINUATION Frames
Published Apr 3, 2024 · Updated Aug 12, 2026 · Also known as GHSA-qjfw-cvjf-f4fm
Key Facts
Patch immediately- CVE-2024-2653 is a high-severity vulnerability (CVSS 8.2 v3.1) affecting amphp/http (composer), amphp/http-client (composer).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 83% probability of exploitation in the next 30 days.
- Fixed versions are available, including amphp/http 1.7.3, amphp/http 2.1.1.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS (30-day exploit likelihood)
83%
Higher than 99.6% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2024-2653 brief as a PDF
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Description
amphp/http will collect CONTINUATION frames in an unbounded buffer and will not check a limit until it has received the set END_HEADERS flag, resulting in an OOM crash.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| amphp/httpcomposer | >= 2.0.0, >= 2.0.0-beta.1 | 1.7.3 |
| amphp/http-clientcomposer | >= 4.0.0-rc10, >= v4.0.0-rc10 | n/a |
Patched Releases
amphp/http
1.7.3, 2.1.1
Timeline
Publicly disclosed
Apr 3, 2024
Last updated
Aug 12, 2026
Weakness Type
- CWE-400 Uncontrolled Resource Consumption
References
- advisoryGHSA advisory
- advisoryhttps://github.com/amphp/http-client/security/advisories/GHSA-w8gf-g2vq-j2f4
- advisoryhttps://github.com/amphp/http/commit/3a33e68a3b53f7279217238e89748cf0cb30b8a6
- advisoryhttps://github.com/amphp/http/commit/881cc33da236fbcd0cb0cf6c2bfc7efcf80ede76
- advisoryhttps://github.com/amphp/http/security/advisories/GHSA-qjfw-cvjf-f4fm
FAQ
Common Questions.
amphp/http will collect CONTINUATION frames in an unbounded buffer and will not check a limit until it has received the set END_HEADERS flag, resulting in an OOM crash.
Affected: amphp/http (composer) versions >= 2.0.0, >= 2.0.0-beta.1; amphp/http-client (composer) versions >= 4.0.0-rc10, >= v4.0.0-rc10. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including amphp/http 1.7.3, amphp/http 2.1.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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