Medium
dash — security advisory
A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \u or \U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write one or two bytes past that reservation.
- Products
- dash
- Affected versions
- 0.5.10.2-6, 0.5.11+git20210120+802ebd4-1build1, 0.5.11+git20210903+057cd650a4ed-3, 0.5.11+git20210903+057cd650a4ed-3build1, 0.5.12-12ubuntu2, 0.5.12-12ubuntu3, 0.5.12-6ubuntu1, 0.5.12-6ubuntu3, 0.5.12-6ubuntu4, 0.5.12-6ubuntu5, 0.5.7-3ubuntu1, 0.5.7-4ubuntu1, 0.5.7-4ubuntu2, 0.5.8-2.10, 0.5.8-2.1ubuntu2, 0.5.8-2.3ubuntu1, 0.5.8-2.5ubuntu1, 0.5.8-2.9ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-102474
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:53 UTC · Revision 1
Source evidence
A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \u or \U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write one or two bytes past that reservation.
osv:UBUNTU-CVE-2026-102474
dash
Fixed versions: Not specified
dash
Fixed versions: Not specified
dash
Fixed versions: Not specified
dash
Fixed versions: Not specified
dash
Fixed versions: Not specified
dash
Fixed versions: Not specified
dash
Fixed versions: Not specified
dash
Fixed versions: Not specified
Complete source record
{
"id": "3a1bdda8ca8f9a32bbd35af93178410ecbc343ab7dba77766e036bfb0e6990a8",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-102474",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-102474",
"summary": "A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \\u or \\U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write one or two bytes past that reservation.",
"evidence": "osv:UBUNTU-CVE-2026-102474",
"products": [
{
"name": {
"value": "dash",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.5.7-3ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "0.5.7-4ubuntu1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "dash",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.5.7-4ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "0.5.8-2.1ubuntu2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
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"fixed_versions": [],
"affected_versions": [
{
"value": "0.5.8-2.3ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "0.5.8-2.5ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "0.5.8-2.9ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "0.5.8-2.10",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "dash",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.5.10.2-6",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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"affected_versions": [
{
"value": "0.5.11+git20210120+802ebd4-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "0.5.11+git20210903+057cd650a4ed-3",
"evidence": "/affected/4/versions"
},
{
"value": "0.5.11+git20210903+057cd650a4ed-3build1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "dash",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.5.12-6ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "0.5.12-6ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "0.5.12-6ubuntu4",
"evidence": "/affected/5/versions"
},
{
"value": "0.5.12-6ubuntu5",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "dash",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.5.12-12ubuntu3",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "dash",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.5.12-12ubuntu2",
"evidence": "/affected/7/versions"
},
{
"value": "0.5.12-12ubuntu3",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-102474",
"aliases": [
"UBUNTU-CVE-2026-102474"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dash",
"purl": "pkg:deb/ubuntu/dash?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
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"0.5.7-4ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102474.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ash",
"binary_version": "0.5.7-4ubuntu1"
},
{
"binary_name": "dash",
"binary_version": "0.5.7-4ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dash",
"purl": "pkg:deb/ubuntu/dash?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.5.7-4ubuntu2",
"0.5.8-2.1ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102474.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ash",
"binary_version": "0.5.8-2.1ubuntu2"
},
{
"binary_name": "dash",
"binary_version": "0.5.8-2.1ubuntu2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dash",
"purl": "pkg:deb/ubuntu/dash?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"0.5.8-2.3ubuntu1",
"0.5.8-2.5ubuntu1",
"0.5.8-2.9ubuntu1",
"0.5.8-2.10"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102474.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ash",
"binary_version": "0.5.8-2.10"
},
{
"binary_name": "dash",
"binary_version": "0.5.8-2.10"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dash",
"purl": "pkg:deb/ubuntu/dash?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"0.5.10.2-6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102474.json"
},
"ecosystem_specific": {
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{
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},
{
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}
]
}
},
{
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}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/dash?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.5.11+git20210120+802ebd4-1build1",
"0.5.11+git20210903+057cd650a4ed-3",
"0.5.11+git20210903+057cd650a4ed-3build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102474.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ash",
"binary_version": "0.5.11+git20210903+057cd650a4ed-3build1"
},
{
"binary_name": "dash",
"binary_version": "0.5.11+git20210903+057cd650a4ed-3build1"
}
]
}
},
{
"ranges": [
{
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}
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}
],
"package": {
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"purl": "pkg:deb/ubuntu/dash?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.5.12-6ubuntu1",
"0.5.12-6ubuntu3",
"0.5.12-6ubuntu4",
"0.5.12-6ubuntu5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102474.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ash",
"binary_version": "0.5.12-6ubuntu5"
},
{
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}
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{
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"ecosystem": "Ubuntu:26.10"
},
"versions": [
"0.5.12-12ubuntu3"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
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}
]
}
},
{
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{
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}
]
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],
"package": {
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.5.12-12ubuntu2",
"0.5.12-12ubuntu3"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
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}
]
}
}
],
"modified": "2026-10-17T12:59:46.086863881Z",
"provider": "osv",
"upstream": [
"CVE-2026-102474"
],
"references": [
"https://ubuntu.com/security/CVE-2026-102474",
"https://www.cve.org/CVERecord?id=CVE-2026-102474",
"https://access.redhat.com/security/cve/CVE-2026-102474"
]
},
"related_cves": [
{
"value": "CVE-2026-102474",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359753,
"published_at": "2026-09-29T10:17:00+00:00"
}