DEBIAN-CVE-2026-63379
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.
DEBIAN-CVE-2026-63379
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-63379
libevent
Source reference: /affected/0/package/name
- Affected versions
- 2.1.12-stable-8
Source reference:
/affected/0/versions - Fixed versions
- 2.1.12-stable-8+deb12u1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
libevent
Source reference: /affected/1/package/name
- Affected versions
- 2.1.12-stable-10
Source reference:
/affected/1/versions - Fixed versions
- 2.1.13-stable-1~deb13u1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
libevent
Source reference: /affected/2/package/name
- Affected versions
- 2.1.12-stable-10
Source reference:
/affected/2/versions2.1.13-stable-1~deb13u1Source reference:
/affected/2/versions - Fixed versions
- 2.1.13-stable-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.12-stable-8+deb12u1"
}
]
}
],
"package": {
"name": "libevent",
"purl": "pkg:deb/debian/libevent?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.1.12-stable-8"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63379.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.13-stable-1~deb13u1"
}
]
}
],
"package": {
"name": "libevent",
"purl": "pkg:deb/debian/libevent?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.1.12-stable-10"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63379.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.13-stable-1"
}
]
}
],
"package": {
"name": "libevent",
"purl": "pkg:deb/debian/libevent?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.1.12-stable-10",
"2.1.13-stable-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63379.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58117 · Revision 1
- Added to Heist Feed
- Publisher date