AZL-96941
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-96941.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-96941
- Upstream
- Published
- 2026-08-20T18:16:35Z
- Modified
- 2026-09-10T14:17:39Z
- Summary
- CVE-2026-63379 affecting package libevent for versions less than 2.1.13-1
- Details
-
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req->input_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
- References