Medium
mbedtls — security advisory
An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is a Predictable Seed in a Pseudo-Random Number Generator (PRNG).
- Products
- mbedtls
- Affected versions
- 2.1.2-1, 2.16.11-0.1ubuntu1, 2.16.11-0.3, 2.16.2-1, 2.16.3-1, 2.16.4-1ubuntu2, 2.16.4-1ubuntu2+esm1, 2.16.9-0.1ubuntu1, 2.2.0-1, 2.2.1-1, 2.2.1-2, 2.2.1-2ubuntu0.1, 2.2.1-2ubuntu0.2, 2.2.1-2ubuntu0.3, 2.28.0-1, 2.28.0-1build1, 2.28.0-1ubuntu0.1~esm1, 2.28.3-1, 2.28.6-1ubuntu1, 2.28.7-1.1ubuntu1, 2.28.7-1ubuntu1, 2.28.8-1, 2.28.8-1ubuntu0.1~esm1, 2.5.1-1ubuntu1, 2.6.0-1, 2.7.0-2, 2.8.0-1, 2.8.0-1ubuntu0.1~esm1, 3.6.2-3ubuntu1, 3.6.5-0.1ubuntu1, 3.6.5-0.1ubuntu2, 3.6.6-0.1ubuntu1, 3.6.7-3ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-34871
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:00 UTC · Revision 1
Source evidence
An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is a Predictable Seed in a Pseudo-Random Number Generator (PRNG).
osv:UBUNTU-CVE-2026-34871
mbedtls
Fixed versions: Not specified
mbedtls
Fixed versions: Not specified
mbedtls
Fixed versions: Not specified
mbedtls
Fixed versions: Not specified
mbedtls
Fixed versions: Not specified
mbedtls
Fixed versions: Not specified
mbedtls
Fixed versions: Not specified
mbedtls
Fixed versions: Not specified
Complete source record
{
"id": "1ba493c02ad4f8616ba22512ab6434018101230cdc191cbcd0add2aa0a53f844",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-34871",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-34871",
"summary": "An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is a Predictable Seed in a Pseudo-Random Number Generator (PRNG).",
"evidence": "osv:UBUNTU-CVE-2026-34871",
"products": [
{
"name": {
"value": "mbedtls",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.1.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1-2ubuntu0.1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1-2ubuntu0.2",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.1-2ubuntu0.3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.5.1-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "2.6.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.7.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.8.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.8.0-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "mbedtls",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.16.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.16.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.16.4-1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "2.16.4-1ubuntu2+esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "mbedtls",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.16.9-0.1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2.16.11-0.1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2.16.11-0.3",
"evidence": "/affected/3/versions"
},
{
"value": "2.28.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.28.0-1build1",
"evidence": "/affected/3/versions"
},
{
"value": "2.28.0-1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "mbedtls",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.28.3-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.28.6-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "2.28.7-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "2.28.7-1.1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "2.28.8-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.28.8-1ubuntu0.1~esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "mbedtls",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.6.2-3ubuntu1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "mbedtls",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.6.5-0.1ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "3.6.6-0.1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "3.6.7-3ubuntu1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "mbedtls",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.6.2-3ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "3.6.5-0.1ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "3.6.5-0.1ubuntu2",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-34871",
"aliases": [
"UBUNTU-CVE-2026-34871"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mbedtls",
"purl": "pkg:deb/ubuntu/mbedtls?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"2.1.2-1",
"2.2.0-1",
"2.2.1-1",
"2.2.1-2",
"2.2.1-2ubuntu0.1",
"2.2.1-2ubuntu0.2",
"2.2.1-2ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34871.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmbedcrypto0",
"binary_version": "2.2.1-2ubuntu0.3"
},
{
"binary_name": "libmbedtls10",
"binary_version": "2.2.1-2ubuntu0.3"
},
{
"binary_name": "libmbedx509-0",
"binary_version": "2.2.1-2ubuntu0.3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
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}
],
"package": {
"name": "mbedtls",
"purl": "pkg:deb/ubuntu/mbedtls?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"2.5.1-1ubuntu1",
"2.6.0-1",
"2.7.0-2",
"2.8.0-1",
"2.8.0-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34871.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmbedcrypto1",
"binary_version": "2.8.0-1ubuntu0.1~esm1"
},
{
"binary_name": "libmbedtls10",
"binary_version": "2.8.0-1ubuntu0.1~esm1"
},
{
"binary_name": "libmbedx509-0",
"binary_version": "2.8.0-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mbedtls",
"purl": "pkg:deb/ubuntu/mbedtls?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"2.16.2-1",
"2.16.3-1",
"2.16.4-1ubuntu2",
"2.16.4-1ubuntu2+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34871.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmbedcrypto3",
"binary_version": "2.16.4-1ubuntu2+esm1"
},
{
"binary_name": "libmbedtls12",
"binary_version": "2.16.4-1ubuntu2+esm1"
},
{
"binary_name": "libmbedx509-0",
"binary_version": "2.16.4-1ubuntu2+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mbedtls",
"purl": "pkg:deb/ubuntu/mbedtls?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"2.16.9-0.1ubuntu1",
"2.16.11-0.1ubuntu1",
"2.16.11-0.3",
"2.28.0-1",
"2.28.0-1build1",
"2.28.0-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34871.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmbedcrypto7",
"binary_version": "2.28.0-1ubuntu0.1~esm1"
},
{
"binary_name": "libmbedtls14",
"binary_version": "2.28.0-1ubuntu0.1~esm1"
},
{
"binary_name": "libmbedx509-1",
"binary_version": "2.28.0-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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],
"package": {
"name": "mbedtls",
"purl": "pkg:deb/ubuntu/mbedtls?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"2.28.3-1",
"2.28.6-1ubuntu1",
"2.28.7-1ubuntu1",
"2.28.7-1.1ubuntu1",
"2.28.8-1",
"2.28.8-1ubuntu0.1~esm1"
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"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmbedcrypto7t64",
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},
{
"binary_name": "libmbedtls14t64",
"binary_version": "2.28.8-1ubuntu0.1~esm1"
},
{
"binary_name": "libmbedx509-1t64",
"binary_version": "2.28.8-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/mbedtls?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"3.6.2-3ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34871.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmbedcrypto16",
"binary_version": "3.6.2-3ubuntu1"
},
{
"binary_name": "libmbedtls21",
"binary_version": "3.6.2-3ubuntu1"
},
{
"binary_name": "libmbedx509-7",
"binary_version": "3.6.2-3ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
}
]
}
],
"package": {
"name": "mbedtls",
"purl": "pkg:deb/ubuntu/mbedtls?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"3.6.5-0.1ubuntu2",
"3.6.6-0.1ubuntu1",
"3.6.7-3ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34871.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmbedcrypto16",
"binary_version": "3.6.7-3ubuntu1"
},
{
"binary_name": "libmbedtls21",
"binary_version": "3.6.7-3ubuntu1"
},
{
"binary_name": "libmbedx509-7",
"binary_version": "3.6.7-3ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mbedtls",
"purl": "pkg:deb/ubuntu/mbedtls?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"3.6.2-3ubuntu1",
"3.6.5-0.1ubuntu1",
"3.6.5-0.1ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34871.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmbedcrypto16",
"binary_version": "3.6.5-0.1ubuntu2"
},
{
"binary_name": "libmbedtls21",
"binary_version": "3.6.5-0.1ubuntu2"
},
{
"binary_name": "libmbedx509-7",
"binary_version": "3.6.5-0.1ubuntu2"
}
]
}
}
],
"modified": "2026-10-17T13:00:02.173235662Z",
"provider": "osv",
"upstream": [
"CVE-2026-34871"
],
"references": [
"https://ubuntu.com/security/CVE-2026-34871",
"https://www.cve.org/CVERecord?id=CVE-2026-34871"
]
},
"related_cves": [
{
"value": "CVE-2026-34871",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360159,
"published_at": "2026-04-01T19:16:00+00:00"
}