Medium
Heap buffer overflow in CertFromX509() via AuthorityKeyIdentifier
Type: advisorySources: OSV
Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-5447
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 11:12 UTC · Revision 1
Source evidence
Heap buffer overflow in CertFromX509() via AuthorityKeyIdentifier
core-osv · Original sourcePublished 9 Apr 2026, 20:13 UTC
Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.
osv:CVE-2026-5447
Complete source record
{
"id": "3f108f727d15ebeda4f48e3eeb3287976b8b1cb0c5b4ae587e851a5459e31e74",
"url": "https://osv.dev/vulnerability/CVE-2026-5447",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Heap buffer overflow in CertFromX509() via AuthorityKeyIdentifier",
"summary": "Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.",
"evidence": "osv:CVE-2026-5447",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-5447",
"aliases": [
"CVE-2026-5447"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/wolfssl/wolfssl",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "1d363f3adceba9d1478230ede476a37b0dcdef24"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "5.9.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "5.9.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"v5.8.4-stable",
"wolfEntropy2d",
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"v4.5.0-stable",
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"v4.3.0-stable",
"v4.2.0c",
"v4.2.0-stable",
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"l",
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"v3.14.4",
"v3.14.2",
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"v3.11.1-tls13-beta",
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"v3.9.8",
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"v3.9.6",
"v3.9.1",
"v3.9.0",
"v3.8.0",
"v3.7.3",
"v3.7.1",
"v3.7.0",
"v3.6.9",
"v3.6.8",
"v3.4.6",
"v3.4.2",
"v3.4.0",
"v3.3.3",
"v3.3.0",
"v3.2.6",
"v3.2.4",
"v3.2.0",
"v2.9.4",
"v2.9.2",
"v2.9.1",
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"v2.8.4",
"v2.8.3",
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"v2.7.0",
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"v2.0.6",
"v2.0.3",
"v2.0.2",
"v2.0rc3",
"v2.0rc2b",
"v2.0rc2",
"v2.0rc1",
"v1.9.0",
"v1.8.8.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5447.json"
}
}
],
"modified": "2026-10-28T02:30:34.618016385Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5447.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-5447",
"https://github.com/wolfSSL/wolfssl/pull/10112",
"https://github.com/wolfSSL/wolfssl"
],
"provider_metadata": {
"cwe_ids": [
"CWE-122"
],
"cna_assigner": "wolfSSL",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5447.json"
}
},
"related_cves": [
{
"value": "CVE-2026-5447",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 501941,
"published_at": "2026-04-09T20:13:34.398+00:00"
}