Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Versions of the react/http Packagist package from 1.0.0 before 1.11.1 are affected. A remote server that the client connects to, including through a redirect, can send response headers without ever ending the header section, causing the client to buffer data without limit until PHP's memory limit is exhausted and the process crashes. No authentication or user interaction is needed. Upgrade to react/http 1.11.1 or later, which is listed as the fixed version.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0052, the 44th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:53 UTC First seen by agentprime
- 31 Oct 2026, 13:53 UTC Confirmed by OSV