High
Security advisory
smtpd/table.c in OpenSMTPD before 6.8.0p1 lacks a certain regfree, which might allow attackers to trigger a "very significant" memory leak via messages to an instance that performs many regex lookups.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-35679
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:26 UTC · Revision 1
Source evidence
smtpd/table.c in OpenSMTPD before 6.8.0p1 lacks a certain regfree, which might allow attackers to trigger a "very significant" memory leak via messages to an instance that performs many regex lookups.
osv:CVE-2020-35679
Complete source record
{
"id": "2258255d1c940721bb217df0ae1cd3e5efff0b1d0dc5f3729a1f092e99753f23",
"url": "https://osv.dev/vulnerability/CVE-2020-35679",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-35679",
"summary": "smtpd/table.c in OpenSMTPD before 6.8.0p1 lacks a certain regfree, which might allow attackers to trigger a \"very significant\" memory leak via messages to an instance that performs many regex lookups.",
"evidence": "osv:CVE-2020-35679",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-35679",
"aliases": [
"CVE-2020-35679"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/openbsd/src",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "79a034b4aed29e965f45a13409268290c9910043"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
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"source": "REFERENCES_COMMIT"
}
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}
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35679.json",
"vanir_signatures": [
{
"id": "CVE-2020-35679-421b970c",
"digest": {
"length": 339,
"function_hash": "168689518179268419596766045625718440344"
},
"source": "https://github.com/openbsd/src/commit/79a034b4aed29e965f45a13409268290c9910043",
"target": {
"file": "usr.sbin/smtpd/table.c",
"function": "table_regex_match"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-35679-5a6fe561",
"digest": {
"threshold": 0.9,
"line_hashes": [
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},
"source": "https://github.com/openbsd/src/commit/79a034b4aed29e965f45a13409268290c9910043",
"target": {
"file": "usr.sbin/smtpd/table.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-24T14:24:36Z"
}
},
{
"ranges": [
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"type": "GIT",
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{
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"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:patch1-rc1:*:*:*:*:*:*",
"range": [
{
"introduced": "6.8.0-patch1\\-rc1"
},
{
"last_affected": "6.8.0-patch1\\-rc1"
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"source": "CPE_STRING"
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}
}
],
"versions": [
"6.8.0-patch1\\-rc1",
"opensmtpd-6.8.0p1-rc1",
"6.8.0p1-rc1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35679.json"
}
}
],
"modified": "2026-10-24T14:24:36.617882278Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/",
"https://www.mail-archive.com/misc%40opensmtpd.org/msg05188.html",
"https://poolp.org/posts/2020-12-24/december-2020-opensmtpd-6.8.0p1-released-fixed-several-bugs-proposed-several-diffs-book-is-on-github/",
"https://security.gentoo.org/glsa/202105-12",
"https://github.com/openbsd/src/commit/79a034b4aed29e965f45a13409268290c9910043"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:opensmtpd:opensmtpd:*:*:*:*:*:*:*:*"
],
"vendor_product": "opensmtpd:opensmtpd",
"extracted_events": [
{
"range": [
{
"fixed": "6.8.0"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "32"
},
{
"last_affected": "32"
},
{
"introduced": "33"
},
{
"last_affected": "33"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:-:*:*:*:*:*:*"
],
"vendor_product": "opensmtpd:opensmtpd",
"extracted_events": [
{
"range": [
{
"introduced": "6.8.0-NA"
},
{
"last_affected": "6.8.0-NA"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-35679",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 443708,
"published_at": "2020-12-24T16:15:15.537+00:00"
}