DEBIAN-CVE-2026-3849
Stack Buffer Overflow in wc_HpkeLabeledExtract via Oversized ECH Config. A vulnerability existed in wolfSSL 5.8.4 ECH (Encrypted Client Hello) support, where a maliciously crafted ECH config could cause a stack buffer overflow on the client side, leading to potential remote execution and client program crash. This could be exploited by a malicious TLS server supporting ECH. Note that ECH is off by default, and is only enabled with enable-ech.
DEBIAN-CVE-2026-3849
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-2026-3849
wolfssl
Source reference: /affected/0/package/name
- Affected versions
- 5.5.4-2
Source reference:
/affected/0/versions5.5.4-2+deb12u1Source reference:
/affected/0/versions5.5.4-2+deb12u2Source reference:
/affected/0/versions5.5.4-2+deb12u3Source reference:
/affected/0/versions5.5.4-2.1Source reference:
/affected/0/versions5.6.4-1Source reference:
/affected/0/versions5.6.4-2Source reference:
/affected/0/versions5.6.6-1Source reference:
/affected/0/versions5.6.6-1.1Source reference:
/affected/0/versions5.6.6-1.2Source reference:
/affected/0/versions5.6.6-1.3Source reference:
/affected/0/versions5.6.6-1.3~exp1Source reference:
/affected/0/versions5.7.0-0.1Source reference:
/affected/0/versions5.7.0-0.2Source reference:
/affected/0/versions5.7.0-0.3Source reference:
/affected/0/versions5.7.2-0.1Source reference:
/affected/0/versions5.7.2-0.2Source reference:
/affected/0/versions5.7.2-0.3Source reference:
/affected/0/versions5.7.2-0.4Source reference:
/affected/0/versions5.8.2-1Source reference:
/affected/0/versions5.8.2-1.1Source reference:
/affected/0/versions5.8.2-1.2Source reference:
/affected/0/versions5.8.4-1Source reference:
/affected/0/versions5.9.0-0.1Source reference:
/affected/0/versions5.9.0-0.2Source reference:
/affected/0/versions5.9.1-0.1Source reference:
/affected/0/versions5.9.2-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
wolfssl
Source reference: /affected/1/package/name
- Affected versions
- 5.7.2-0.1
Source reference:
/affected/1/versions5.7.2-0.1+deb13u1Source reference:
/affected/1/versions5.7.2-0.1+deb13u2Source reference:
/affected/1/versions5.7.2-0.2Source reference:
/affected/1/versions5.7.2-0.3Source reference:
/affected/1/versions5.7.2-0.4Source reference:
/affected/1/versions5.8.2-1Source reference:
/affected/1/versions5.8.2-1.1Source reference:
/affected/1/versions5.8.2-1.2Source reference:
/affected/1/versions5.8.4-1Source reference:
/affected/1/versions5.9.0-0.1Source reference:
/affected/1/versions5.9.0-0.2Source reference:
/affected/1/versions5.9.1-0.1Source reference:
/affected/1/versions5.9.2-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- 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"
}
]
}
],
"package": {
"name": "wolfssl",
"purl": "pkg:deb/debian/wolfssl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"5.5.4-2",
"5.5.4-2+deb12u1",
"5.5.4-2+deb12u2",
"5.5.4-2+deb12u3",
"5.5.4-2.1",
"5.6.4-1",
"5.6.4-2",
"5.6.6-1",
"5.6.6-1.1",
"5.6.6-1.2",
"5.6.6-1.3",
"5.6.6-1.3~exp1",
"5.7.0-0.1",
"5.7.0-0.2",
"5.7.0-0.3",
"5.7.2-0.1",
"5.7.2-0.2",
"5.7.2-0.3",
"5.7.2-0.4",
"5.8.2-1",
"5.8.2-1.1",
"5.8.2-1.2",
"5.8.4-1",
"5.9.0-0.1",
"5.9.0-0.2",
"5.9.1-0.1",
"5.9.2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3849.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "wolfssl",
"purl": "pkg:deb/debian/wolfssl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"5.7.2-0.1",
"5.7.2-0.1+deb13u1",
"5.7.2-0.1+deb13u2",
"5.7.2-0.2",
"5.7.2-0.3",
"5.7.2-0.4",
"5.8.2-1",
"5.8.2-1.1",
"5.8.2-1.2",
"5.8.4-1",
"5.9.0-0.1",
"5.9.0-0.2",
"5.9.1-0.1",
"5.9.2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3849.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57565 · Revision 1
- Added to Heist Feed
- Publisher date