High
Security advisory
libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-3823
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:04 UTC · Revision 1
Source evidence
libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.
osv:CVE-2019-3823
Complete source record
{
"id": "9a7906b4491c39a4860c5d17c1f4a967afee62b615c39b197042ed9765051ded",
"url": "https://osv.dev/vulnerability/CVE-2019-3823",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-3823",
"summary": "libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.",
"evidence": "osv:CVE-2019-3823",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2019-3823",
"aliases": [
"CURL-CVE-2019-3823",
"CVE-2019-3823"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/curl/curl",
"type": "GIT",
"events": [
{
"introduced": "0966b324d911423c81351fb12e9219f71cd63be8"
},
{
"fixed": "f3294d9d86e6a7915a967efff2842089b8b0d071"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "7.34.0"
},
{
"fixed": "7.64.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"curl-7_63_0",
"curl-7_62_0",
"curl-7_61_1",
"curl-7_61_0",
"curl-7_60_0",
"curl-7_59_0",
"curl-7_58_0",
"curl-7_57_0",
"curl-7_56_1",
"curl-7_56_0",
"curl-7_55_1",
"curl-7_55_0",
"curl-7_54_1",
"curl-7_54_0",
"curl-7_53_1",
"curl-7_53_0",
"curl-7_52_1",
"curl-7_52_0",
"curl-7_51_0",
"curl-7_50_3",
"curl-7_50_2",
"curl-7_50_1",
"curl-7_50_0",
"curl-7_49_1",
"curl-7_49_0",
"curl-7_48_0",
"curl-7_47_1",
"curl-7_47_0",
"curl-7_46_0",
"curl-7_45_0",
"curl-7_44_0",
"curl-7_43_0",
"curl-7_42_0",
"curl-7_41_0",
"curl-7_40_0",
"curl-7_39_0",
"curl-7_38_0",
"curl-7_37_1",
"curl-7_37_0",
"curl-7_36_0",
"curl-7_35_0",
"curl-7_34_0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-3823.json"
}
}
],
"modified": "2026-10-24T10:31:02.534675906Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/pdf/ssa-936080.pdf",
"https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E",
"https://access.redhat.com/errata/RHSA-2019:3701",
"https://security.gentoo.org/glsa/201903-03",
"https://usn.ubuntu.com/3882-1/",
"https://www.debian.org/security/2019/dsa-4386",
"https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html",
"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3823",
"https://curl.haxx.se/docs/CVE-2019-3823.html",
"https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html",
"https://security.netapp.com/advisory/ntap-20190315-0001/"
],
"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:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "18.10"
},
{
"last_affected": "18.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:communications_operations_monitor:3.4:*:*:*:*:*:*:*",
"cpe:2.3:a:oracle:communications_operations_monitor:4.0:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:communications_operations_monitor",
"extracted_events": [
{
"range": [
{
"introduced": "3.4"
},
{
"last_affected": "3.4"
},
{
"introduced": "4.0"
},
{
"last_affected": "4.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:http_server",
"extracted_events": [
{
"range": [
{
"introduced": "12.2.1.3.0"
},
{
"last_affected": "12.2.1.3.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:oracle:secure_global_desktop:5.4:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:secure_global_desktop",
"extracted_events": [
{
"range": [
{
"introduced": "5.4"
},
{
"last_affected": "5.4"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2019-3823",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 440037,
"published_at": "2019-02-06T20:29:00.4+00:00"
}