Critical
Security advisory
An issue was discovered in slicer69 doas before 6.2 on certain platforms other than OpenBSD. On platforms without strtonum(3), sscanf was used without checking for error cases. Instead, the uninitialized variable errstr was checked and in some cases returned success even if sscanf failed. The result was that, instead of reporting that the supplied username or group name did not exist, it would execute the command as root.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-15900
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:28 UTC · Revision 1
Source evidence
An issue was discovered in slicer69 doas before 6.2 on certain platforms other than OpenBSD. On platforms without strtonum(3), sscanf was used without checking for error cases. Instead, the uninitialized variable errstr was checked and in some cases returned success even if sscanf failed. The result was that, instead of reporting that the supplied username or group name did not exist, it would execute the command as root.
osv:CVE-2019-15900
Complete source record
{
"id": "0283691c81cc3e62a5439824429a334dfa799d58d8e6c3b347b3dd01dff766b6",
"url": "https://osv.dev/vulnerability/CVE-2019-15900",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-15900",
"summary": "An issue was discovered in slicer69 doas before 6.2 on certain platforms other than OpenBSD. On platforms without strtonum(3), sscanf was used without checking for error cases. Instead, the uninitialized variable errstr was checked and in some cases returned success even if sscanf failed. The result was that, instead of reporting that the supplied username or group name did not exist, it would execute the command as root.",
"evidence": "osv:CVE-2019-15900",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2019-15900",
"aliases": [
"CVE-2019-15900"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/slicer69/doas",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "1c2858c681935a040cd2313e599b05a5dd40be95"
},
{
"fixed": "2f83222829448e5bc4c9391d607ec265a1e06531"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:doas_project:doas:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "6.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "2f83222829448e5bc4c9391d607ec265a1e06531"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"6.1p1",
"6.1",
"6.0p4",
"6.0p3",
"6.0p2",
"6.0p1",
"6.0-1",
"v6.0p0",
"6.0p0",
"v6.0-0",
"v5.9-7",
"v5.9-6",
"v5.9-5",
"v5.9-4",
"v5.9-3",
"v5.9-2",
"v5.9-1",
"v5.9"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-15900.json",
"vanir_signatures": [
{
"id": "CVE-2019-15900-3ae2e939",
"digest": {
"length": 370,
"function_hash": "266296991134810920258128410524703637520"
},
"source": "https://github.com/slicer69/doas/commit/2f83222829448e5bc4c9391d607ec265a1e06531",
"target": {
"file": "doas.c",
"function": "parsegid"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2019-15900-68bce56d",
"digest": {
"threshold": 0.9,
"line_hashes": [
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]
},
"source": "https://github.com/slicer69/doas/commit/1c2858c681935a040cd2313e599b05a5dd40be95",
"target": {
"file": "execvpe.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2019-15900-a16f009a",
"digest": {
"threshold": 0.9,
"line_hashes": [
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},
"source": "https://github.com/slicer69/doas/commit/2f83222829448e5bc4c9391d607ec265a1e06531",
"target": {
"file": "doas.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2019-15900-b22417ee",
"digest": {
"length": 1884,
"function_hash": "260128427067475575999234089115858697183"
},
"source": "https://github.com/slicer69/doas/commit/1c2858c681935a040cd2313e599b05a5dd40be95",
"target": {
"file": "execvpe.c",
"function": "execvpe"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2019-15900-dedc7342",
"digest": {
"length": 370,
"function_hash": "8583189512477610533521138920454968142"
},
"source": "https://github.com/slicer69/doas/commit/2f83222829448e5bc4c9391d607ec265a1e06531",
"target": {
"file": "doas.c",
"function": "parseuid"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:41:20Z"
}
}
],
"modified": "2026-10-20T13:41:20.149981343Z",
"provider": "osv",
"references": [
"https://github.com/slicer69/doas/compare/6.1p1...6.2",
"https://github.com/slicer69/doas/commit/2f83222829448e5bc4c9391d607ec265a1e06531"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2019-15900",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 387963,
"published_at": "2019-10-18T16:15:10.257+00:00"
}