CVE-2025-43859
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-43859
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-43859.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-43859
- Aliases
- Downstream
- Related
- Published
- 2025-04-24T18:15:53.328Z
- Modified
- 2025-12-05T10:15:31.487393Z
- Severity
-
- 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- h11 accepts some malformed Chunked-Encoding bodies
- Details
-
h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-444" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/43xxx/CVE-2025-43859.json" }- References