Medium
Security advisory
Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-0739
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:36 UTC · Revision 1
Source evidence
Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).
osv:CVE-2018-0739
Complete source record
{
"id": "79c6f74e89c70f7b40523089a6058a300753f9fbad7adff9c1c42048a5a99395",
"url": "https://osv.dev/vulnerability/CVE-2018-0739",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-0739",
"summary": "Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).",
"evidence": "osv:CVE-2018-0739",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2018-0739",
"aliases": [
"CVE-2018-0739"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/openssl/openssl",
"type": "GIT",
"events": [
{
"introduced": "e818b74be2170fbe957a07b0da4401c2b694b3b8"
},
{
"last_affected": "e818b74be2170fbe957a07b0da4401c2b694b3b8"
},
{
"introduced": "7ea5bd2b52d0e81eaef3d109b3b12545306f201c"
},
{
"last_affected": "7ea5bd2b52d0e81eaef3d109b3b12545306f201c"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.0.2b"
},
{
"last_affected": "1.0.2n"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.1.0"
},
{
"last_affected": "1.1.0g"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"OpenSSL_1_0_2u",
"OpenSSL_1_1_0l"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-0739.json"
}
}
],
"modified": "2026-10-24T10:30:20.821513485Z",
"provider": "osv",
"references": [
"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2ac4c6f7b2b2af20c0e2b0ba05367e454cd11b33",
"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=9310d45087ae546e27e61ddf8f6367f29848220d",
"https://www.oracle.com//security-alerts/cpujul2021.html",
"https://www.tenable.com/security/tns-2018-04",
"https://www.tenable.com/security/tns-2018-06",
"https://www.tenable.com/security/tns-2018-07",
"https://access.redhat.com/errata/RHSA-2018:3090",
"https://access.redhat.com/errata/RHSA-2018:3221",
"https://access.redhat.com/errata/RHSA-2018:3505",
"https://access.redhat.com/errata/RHSA-2019:0366",
"https://access.redhat.com/errata/RHSA-2019:0367",
"https://access.redhat.com/errata/RHSA-2019:1711",
"https://access.redhat.com/errata/RHSA-2019:1712",
"https://lists.debian.org/debian-lts-announce/2018/03/msg00033.html",
"https://security.gentoo.org/glsa/201811-21",
"https://security.gentoo.org/glsa/202007-53",
"https://security.netapp.com/advisory/ntap-20180330-0002/",
"https://security.netapp.com/advisory/ntap-20180726-0002/",
"https://securityadvisories.paloaltonetworks.com/Home/Detail/133",
"https://usn.ubuntu.com/3611-1/",
"https://usn.ubuntu.com/3611-2/",
"https://www.debian.org/security/2018/dsa-4157",
"https://www.debian.org/security/2018/dsa-4158",
"https://www.openssl.org/news/secadv/20180327.txt",
"https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html",
"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html",
"https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html",
"https://nodejs.org/en/blog/vulnerability/march-2018-security-releases/"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "17.10"
},
{
"last_affected": "17.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
},
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-0739",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430351,
"published_at": "2018-03-27T21:29:00.673+00:00"
}