Low
wolfssl — security advisory
Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.
- Products
- wolfssl
- Affected 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, 5.7.2-0.1+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, 5.9.2-1.1, 5.9.2-1.2
- Fixed versions
- Not specified
- CVEs
- CVE-2025-11934
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 01:16 UTC · Revision 1
Source evidence
Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.
osv:DEBIAN-CVE-2025-11934
wolfssl
Fixed versions: Not specified
wolfssl
Fixed versions: Not specified
Complete source record
{
"id": "b669b2d3a92e881a5da037a1235465001a6cc0418a1897115a6c613c07d6bc7c",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-11934",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2025-11934",
"summary": "Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.",
"evidence": "osv:DEBIAN-CVE-2025-11934",
"products": [
{
"name": {
"value": "wolfssl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.5.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.4-2+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.4-2+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.4-2+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.4-2.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.6.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.6.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "5.6.6-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.6.6-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.6.6-1.2",
"evidence": "/affected/0/versions"
},
{
"value": "5.6.6-1.3",
"evidence": "/affected/0/versions"
},
{
"value": "5.6.6-1.3~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "5.7.0-0.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.7.0-0.2",
"evidence": "/affected/0/versions"
},
{
"value": "5.7.0-0.3",
"evidence": "/affected/0/versions"
},
{
"value": "5.7.2-0.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.7.2-0.2",
"evidence": "/affected/0/versions"
},
{
"value": "5.7.2-0.3",
"evidence": "/affected/0/versions"
},
{
"value": "5.7.2-0.4",
"evidence": "/affected/0/versions"
},
{
"value": "5.8.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.8.2-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.8.2-1.2",
"evidence": "/affected/0/versions"
},
{
"value": "5.8.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.9.0-0.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.9.0-0.2",
"evidence": "/affected/0/versions"
},
{
"value": "5.9.1-0.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.9.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "5.9.2-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.9.2-1.2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "wolfssl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.7.2-0.1",
"evidence": "/affected/1/versions"
},
{
"value": "5.7.2-0.1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "5.7.2-0.1+deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "5.7.2-0.2",
"evidence": "/affected/1/versions"
},
{
"value": "5.7.2-0.3",
"evidence": "/affected/1/versions"
},
{
"value": "5.7.2-0.4",
"evidence": "/affected/1/versions"
},
{
"value": "5.8.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "5.8.2-1.1",
"evidence": "/affected/1/versions"
},
{
"value": "5.8.2-1.2",
"evidence": "/affected/1/versions"
},
{
"value": "5.8.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.0-0.1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.0-0.2",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.1-0.1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.2-1.1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.2-1.2",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "low",
"structured": {
"id": "DEBIAN-CVE-2025-11934",
"aliases": [
"DEBIAN-CVE-2025-11934"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"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",
"5.9.2-1.1",
"5.9.2-1.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-11934.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",
"5.9.2-1.1",
"5.9.2-1.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-11934.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:04:33.212941313Z",
"provider": "osv",
"upstream": [
"CVE-2025-11934"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2025-11934"
]
},
"related_cves": [
{
"value": "CVE-2025-11934",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 423570,
"published_at": "2025-11-21T23:15:44.54+00:00"
}