CriticalFix available
mbedtls — security advisory
An issue was discovered in Mbed TLS before 2.28.1 and 3.x before 3.2.0. In some configurations, an unauthenticated attacker can send an invalid ClientHello message to a DTLS server that causes a heap-based buffer over-read of up to 255 bytes. This can cause a server crash or possibly information disclosure based on error responses. Affected configurations have MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE enabled and MBEDTLS_SSL_IN_CONTENT_LEN less than a threshold that depends on the configuration: 258 bytes if using mbedtls_ssl_cookie_check, and possibly up to 571 bytes with a custom cookie check function.
- Products
- mbedtls
- Affected versions
- Not specified
- Fixed versions
- 2.28.1-r0
- CVEs
- CVE-2022-35409
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 14:13 UTC · Revision 1
Source evidence
An issue was discovered in Mbed TLS before 2.28.1 and 3.x before 3.2.0. In some configurations, an unauthenticated attacker can send an invalid ClientHello message to a DTLS server that causes a heap-based buffer over-read of up to 255 bytes. This can cause a server crash or possibly information disclosure based on error responses. Affected configurations have MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE enabled and MBEDTLS_SSL_IN_CONTENT_LEN less than a threshold that depends on the configuration: 258 bytes if using mbedtls_ssl_cookie_check, and possibly up to 571 bytes with a custom cookie check function.
osv:ALPINE-CVE-2022-35409
mbedtls
Fixed versions: 2.28.1-r0
mbedtls
Fixed versions: 2.28.1-r0
mbedtls
Fixed versions: 2.28.1-r0
mbedtls
Fixed versions: 2.28.1-r0
mbedtls
Fixed versions: 2.28.1-r0
mbedtls
Fixed versions: 2.28.1-r0
mbedtls
Fixed versions: 2.28.1-r0
mbedtls
Fixed versions: 2.28.1-r0
mbedtls
Fixed versions: 2.28.1-r0
Complete source record
{
"id": "65628d1d0660809d69d32bbe4cab6a43786162f3a0c27278f7770adeade67bd6",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2022-35409",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2022-35409",
"summary": "An issue was discovered in Mbed TLS before 2.28.1 and 3.x before 3.2.0. In some configurations, an unauthenticated attacker can send an invalid ClientHello message to a DTLS server that causes a heap-based buffer over-read of up to 255 bytes. This can cause a server crash or possibly information disclosure based on error responses. Affected configurations have MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE enabled and MBEDTLS_SSL_IN_CONTENT_LEN less than a threshold that depends on the configuration: 258 bytes if using mbedtls_ssl_cookie_check, and possibly up to 571 bytes with a custom cookie check function.",
"evidence": "osv:ALPINE-CVE-2022-35409",
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"evidence": "/affected/0/ranges"
}
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{
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{
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{
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{
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"affected_versions": []
}
],
"severity": "critical",
"structured": {
"id": "ALPINE-CVE-2022-35409",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
}
],
"affected": [
{
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"events": [
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{
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"package": {
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"purl": "pkg:apk/alpine/mbedtls?arch=source",
"ecosystem": "Alpine:v3.16"
},
"database_specific": {
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{
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"ecosystem": "Alpine:v3.22"
},
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},
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],
"package": {
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"ecosystem": "Alpine:v3.24"
},
"database_specific": {
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],
"modified": "2026-10-15T07:17:54.234522053Z",
"provider": "osv",
"upstream": [
"CVE-2022-35409"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2022-35409"
]
},
"related_cves": [
{
"value": "CVE-2022-35409",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 321921,
"published_at": "2022-07-15T14:15:09.84+00:00"
}