Low
wc_PKCS7_DecodeEnvelopedData 1 byte out-of-bounds read
Type: advisorySources: OSV
1-byte OOB heap read in wc_PKCS7_DecodeEnvelopedData via zero-length encrypted content. A vulnerability existed in wolfSSL 5.8.4 and earlier, where a 1-byte out-of-bounds heap read in wc_PKCS7_DecodeEnvelopedData could be triggered by a crafted CMS EnvelopedData message with zero-length encrypted content. Note that PKCS7 support is disabled by default.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-4159
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 01:12 UTC · Revision 1
Source evidence
wc_PKCS7_DecodeEnvelopedData 1 byte out-of-bounds read
core-osv · Original sourcePublished 19 Mar 2026, 21:17 UTC
1-byte OOB heap read in wc_PKCS7_DecodeEnvelopedData via zero-length encrypted content. A vulnerability existed in wolfSSL 5.8.4 and earlier, where a 1-byte out-of-bounds heap read in wc_PKCS7_DecodeEnvelopedData could be triggered by a crafted CMS EnvelopedData message with zero-length encrypted content. Note that PKCS7 support is disabled by default.
osv:CVE-2026-4159
Complete source record
{
"id": "08680e1a3eea48d2037833bfdf2427b9956f28e149d8c06b8ff13ffcbfddac98",
"url": "https://osv.dev/vulnerability/CVE-2026-4159",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "wc_PKCS7_DecodeEnvelopedData 1 byte out-of-bounds read",
"summary": "1-byte OOB heap read in wc_PKCS7_DecodeEnvelopedData via zero-length encrypted content. A vulnerability existed in wolfSSL 5.8.4 and earlier, where a 1-byte out-of-bounds heap read in wc_PKCS7_DecodeEnvelopedData could be triggered by a crafted CMS EnvelopedData message with zero-length encrypted content. Note that PKCS7 support is disabled by default.",
"evidence": "osv:CVE-2026-4159",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-4159",
"aliases": [
"CVE-2026-4159"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/wolfssl/wolfssl",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "922d04b3568c6428a9fb905ddee3ef5a68db3108"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "5.9.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "5.9.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4159.json"
}
}
],
"modified": "2026-10-28T02:30:45.781605699Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4159.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-4159",
"https://github.com/wolfSSL/wolfssl/pull/9945"
],
"provider_metadata": {
"cwe_ids": [
"CWE-125"
],
"cna_assigner": "wolfSSL",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4159.json"
}
},
"related_cves": [
{
"value": "CVE-2026-4159",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 513745,
"published_at": "2026-03-19T21:17:46.357+00:00"
}