DEBIAN-CVE-2026-63379
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-63379
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63379.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-63379
- Upstream
- Published
- 2026-08-20T18:16:35Z
- Modified
- 2026-09-18T16:00:07Z
- Severity
-
- 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
- Summary
- [none]
- 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
Affected packages
Debian:12 / libevent
Package
- Name
- libevent
- Purl
- pkg:deb/debian/libevent?arch=source&distro=bookworm
Debian:13 / libevent
Package
- Name
- libevent
- Purl
- pkg:deb/debian/libevent?arch=source&distro=trixie
Debian:14 / libevent
Package
- Name
- libevent
- Purl
- pkg:deb/debian/libevent?arch=source&distro=forky