openssl — security advisory
Issue summary: An established DTLS 1.2 association using an AEAD cipher suite can be terminated by a single unauthenticated datagram whose encrypted fragment is shorter than the mandatory explicit IV and authentication tag overhead. Impact summary: An attacker who can send a datagram that is routed to an existing DTLS 1.2 association can tear that association down without knowing any key material. This is a Denial of Service limited to the targeted association. There is no memory safety or confidentiality impact. CWE: CWE-1284: Improper Validation of Specified Quantity in Input Description: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher suite carries an explicit IV followed by the ciphertext and an authentication tag. When decrypting such a record the record layer passed the record length to the cipher implementation before checking that the record was long enough to contain the explicit IV and the tag. For a record shorter than that overhead the cipher implementation rejected the impossible length, and the record layer treated this as an internal failure and raised a fatal internal_error alert instead of treating the record as one that failed authentication. In TLS 1.2 the same record causes a fatal internal_error alert instead of the expected bad_record_mac alert. Since any undecryptable record already terminates a TLS connection, this is a protocol conformance issue rather than a security issue in TLS. The fix validates the record length against the expli
- Products
- openssl
- Affected versions
- 3.0.10-1, 3.0.10-1~deb12u1, 3.0.11-1, 3.0.11-1~deb12u1, 3.0.11-1~deb12u2, 3.0.12-1, 3.0.12-2, 3.0.13-1~deb12u1, 3.0.13-1~deb12u2, 3.0.14-1~deb12u1, 3.0.14-1~deb12u2, 3.0.15-1~deb12u1, 3.0.16-1~deb12u1, 3.0.17-1~deb12u1, 3.0.17-1~deb12u2, 3.0.17-1~deb12u3, 3.0.18-1~deb12u1, 3.0.18-1~deb12u2, 3.0.19-1~deb12u1, 3.0.19-1~deb12u2, 3.0.20-1~deb12u1, 3.0.20-1~deb12u2, 3.0.22-1~deb12u1, 3.0.9-1, 3.5.1-1, 3.5.1-1+deb13u1, 3.5.2-1, 3.5.3-1, 3.5.4-1, 3.5.4-1~deb13u1, 3.5.4-1~deb13u2, 3.5.5-1, 3.5.5-1~deb13u1, 3.5.5-1~deb13u2, 3.5.6-1~deb13u1, 3.5.6-1~deb13u2, 3.5.7-1~deb13u1, 3.5.7-1~deb13u2, 3.5.7-1~deb13u3, 3.6.0-1, 3.6.0-2, 3.6.0~~alpha1-1, 3.6.0~~beta1-1, 3.6.1-1, 3.6.1-2, 3.6.1-3, 3.6.2-1, 3.6.3-1, 3.6.4-1
- Fixed versions
- 3.0.22-1~deb12u2, 3.5.7-1~deb13u3, 3.6.5-1
- CVEs
- CVE-2026-75806
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 10:34 UTC · Revision 1
Source evidence
Issue summary: An established DTLS 1.2 association using an AEAD cipher suite can be terminated by a single unauthenticated datagram whose encrypted fragment is shorter than the mandatory explicit IV and authentication tag overhead. Impact summary: An attacker who can send a datagram that is routed to an existing DTLS 1.2 association can tear that association down without knowing any key material. This is a Denial of Service limited to the targeted association. There is no memory safety or confidentiality impact. CWE: CWE-1284: Improper Validation of Specified Quantity in Input Description: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher suite carries an explicit IV followed by the ciphertext and an authentication tag. When decrypting such a record the record layer passed the record length to the cipher implementation before checking that the record was long enough to contain the explicit IV and the tag. For a record shorter than that overhead the cipher implementation rejected the impossible length, and the record layer treated this as an internal failure and raised a fatal internal_error alert instead of treating the record as one that failed authentication. In TLS 1.2 the same record causes a fatal internal_error alert instead of the expected bad_record_mac alert. Since any undecryptable record already terminates a TLS connection, this is a protocol conformance issue rather than a security issue in TLS. The fix validates the record length against the expli
osv:DEBIAN-CVE-2026-75806
openssl
Fixed versions: 3.0.22-1~deb12u2
openssl
Fixed versions: 3.5.7-1~deb13u3
openssl
Fixed versions: 3.6.5-1
Complete source record
{
"id": "bbac414fd75e81cce7ec153b387ca9364b4fc87364874b76685156ab0f564737",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-75806",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-75806",
"summary": "Issue summary: An established DTLS 1.2 association using an AEAD cipher suite can be terminated by a single unauthenticated datagram whose encrypted fragment is shorter than the mandatory explicit IV and authentication tag overhead. Impact summary: An attacker who can send a datagram that is routed to an existing DTLS 1.2 association can tear that association down without knowing any key material. This is a Denial of Service limited to the targeted association. There is no memory safety or confidentiality impact. CWE: CWE-1284: Improper Validation of Specified Quantity in Input Description: In TLS 1.2 and DTLS 1.2 every record protected by an AEAD cipher suite carries an explicit IV followed by the ciphertext and an authentication tag. When decrypting such a record the record layer passed the record length to the cipher implementation before checking that the record was long enough to contain the explicit IV and the tag. For a record shorter than that overhead the cipher implementation rejected the impossible length, and the record layer treated this as an internal failure and raised a fatal internal_error alert instead of treating the record as one that failed authentication. In TLS 1.2 the same record causes a fatal internal_error alert instead of the expected bad_record_mac alert. Since any undecryptable record already terminates a TLS connection, this is a protocol conformance issue rather than a security issue in TLS. The fix validates the record length against the expli",
"evidence": "osv:DEBIAN-CVE-2026-75806",
"products": [
{
"name": {
"value": "openssl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.0.22-1~deb12u2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "3.0.10-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.10-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.11-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.11-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.11-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.12-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.12-2",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.13-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.13-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.14-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.14-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.15-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.16-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.17-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.17-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.17-1~deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.18-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.18-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.19-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.19-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.20-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.20-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.22-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.9-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "openssl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.7-1~deb13u3",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "3.5.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.1-1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.4-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.4-1~deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.5-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.5-1~deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.6-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.6-1~deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.7-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "3.5.7-1~deb13u2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "openssl",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.5-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "3.5.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.4-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.4-1~deb13u2",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.5-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.5-1~deb13u2",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.6-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.6-1~deb13u2",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.7-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.7-1~deb13u2",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.7-1~deb13u3",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.0~~alpha1-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.0~~beta1-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.1-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.1-3",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.4-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-75806",
"aliases": [
"DEBIAN-CVE-2026-75806"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.22-1~deb12u2"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.0.10-1",
"3.0.10-1~deb12u1",
"3.0.11-1",
"3.0.11-1~deb12u1",
"3.0.11-1~deb12u2",
"3.0.12-1",
"3.0.12-2",
"3.0.13-1~deb12u1",
"3.0.13-1~deb12u2",
"3.0.14-1~deb12u1",
"3.0.14-1~deb12u2",
"3.0.15-1~deb12u1",
"3.0.16-1~deb12u1",
"3.0.17-1~deb12u1",
"3.0.17-1~deb12u2",
"3.0.17-1~deb12u3",
"3.0.18-1~deb12u1",
"3.0.18-1~deb12u2",
"3.0.19-1~deb12u1",
"3.0.19-1~deb12u2",
"3.0.20-1~deb12u1",
"3.0.20-1~deb12u2",
"3.0.22-1~deb12u1",
"3.0.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75806.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.7-1~deb13u3"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.5.1-1",
"3.5.1-1+deb13u1",
"3.5.2-1",
"3.5.3-1",
"3.5.4-1",
"3.5.4-1~deb13u1",
"3.5.4-1~deb13u2",
"3.5.5-1",
"3.5.5-1~deb13u1",
"3.5.5-1~deb13u2",
"3.5.6-1~deb13u1",
"3.5.6-1~deb13u2",
"3.5.7-1~deb13u1",
"3.5.7-1~deb13u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75806.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.5-1"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.5.1-1",
"3.5.2-1",
"3.5.3-1",
"3.5.4-1",
"3.5.4-1~deb13u1",
"3.5.4-1~deb13u2",
"3.5.5-1",
"3.5.5-1~deb13u1",
"3.5.5-1~deb13u2",
"3.5.6-1~deb13u1",
"3.5.6-1~deb13u2",
"3.5.7-1~deb13u1",
"3.5.7-1~deb13u2",
"3.5.7-1~deb13u3",
"3.6.0-1",
"3.6.0-2",
"3.6.0~~alpha1-1",
"3.6.0~~beta1-1",
"3.6.1-1",
"3.6.1-2",
"3.6.1-3",
"3.6.2-1",
"3.6.3-1",
"3.6.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75806.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T05:00:09.559991447Z",
"provider": "osv",
"upstream": [
"CVE-2026-75806"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-75806"
]
},
"related_cves": [
{
"value": "CVE-2026-75806",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 107903,
"published_at": "2026-09-29T16:17:11.217+00:00"
}