Medium
asterisk — security advisory
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, user supplied/control values for Cookies and any GET variable query Parameter are directly interpolated into the HTML of the page using ast_str_append. The endpoint at GET /httpstatus is the potential vulnerable endpoint relating to asterisk/main /http.c. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
- Products
- asterisk
- Affected versions
- 1:13.1.0~dfsg-1.1ubuntu3, 1:13.1.0~dfsg-1.1ubuntu4, 1:13.1.0~dfsg-1.1ubuntu4.1, 1:13.1.0~dfsg-1.1ubuntu4.1+esm1, 1:13.17.2~dfsg-1ubuntu1, 1:13.17.2~dfsg-2ubuntu1, 1:13.18.1~dfsg-1ubuntu1, 1:13.18.3~dfsg-1ubuntu1, 1:13.18.3~dfsg-1ubuntu2, 1:13.18.3~dfsg-1ubuntu3, 1:13.18.3~dfsg-1ubuntu4, 1:16.16.1~dfsg+~2.10-1, 1:16.16.1~dfsg-2, 1:16.16.1~dfsg-4, 1:16.16.1~dfsg-4build1, 1:16.2.1~dfsg-2build2, 1:16.2.1~dfsg-2build3, 1:16.2.1~dfsg-2ubuntu1, 1:18.10.0~dfsg+~cs6.10.40431411-2, 1:20.4.0~dfsg+~cs6.13.40431414-2, 1:20.5.0~dfsg+~cs6.13.40431414-1, 1:20.5.1~dfsg+~cs6.13.40431414-1, 1:20.5.2~dfsg+~cs6.13.40431414-1, 1:20.6.0~dfsg+~cs6.13.40431414-1, 1:20.6.0~dfsg+~cs6.13.40431414-2, 1:20.6.0~dfsg+~cs6.13.40431414-2build3, 1:20.6.0~dfsg+~cs6.13.40431414-2build4, 1:20.6.0~dfsg+~cs6.13.40431414-2build5, 1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu2, 1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu3, 1:22.2.0~dfsg+~cs6.15.60671435-2, 1:22.3.0~dfsg+~cs6.15.60671435-1, 1:22.4.1~dfsg+~cs6.15.60671435-1, 1:22.4.1~dfsg+~cs6.15.60671435-2, 1:22.5.1~dfsg+~cs6.15.60671435-1, 1:22.5.2~dfsg+~cs6.15.60671435-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-23738
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:05 UTC · Revision 1
Source evidence
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, user supplied/control values for Cookies and any GET variable query Parameter are directly interpolated into the HTML of the page using ast_str_append. The endpoint at GET /httpstatus is the potential vulnerable endpoint relating to asterisk/main /http.c. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
osv:UBUNTU-CVE-2026-23738
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
Complete source record
{
"id": "37a506d158239785c9a998f8f4a5d4ceb985fe2c73cb4aecae47e002423a267a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-23738",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-23738",
"summary": "Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, user supplied/control values for Cookies and any GET variable query Parameter are directly interpolated into the HTML of the page using ast_str_append. The endpoint at GET /httpstatus is the potential vulnerable endpoint relating to asterisk/main /http.c. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.",
"evidence": "osv:UBUNTU-CVE-2026-23738",
"products": [
{
"name": {
"value": "asterisk",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:13.1.0~dfsg-1.1ubuntu3",
"evidence": "/affected/0/versions"
},
{
"value": "1:13.1.0~dfsg-1.1ubuntu4",
"evidence": "/affected/0/versions"
},
{
"value": "1:13.1.0~dfsg-1.1ubuntu4.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:13.17.2~dfsg-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.17.2~dfsg-2ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.1~dfsg-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.3~dfsg-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.3~dfsg-1ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.3~dfsg-1ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.3~dfsg-1ubuntu4",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:16.2.1~dfsg-2build2",
"evidence": "/affected/2/versions"
},
{
"value": "1:16.2.1~dfsg-2build3",
"evidence": "/affected/2/versions"
},
{
"value": "1:16.2.1~dfsg-2ubuntu1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:16.16.1~dfsg-2",
"evidence": "/affected/3/versions"
},
{
"value": "1:16.16.1~dfsg-4",
"evidence": "/affected/3/versions"
},
{
"value": "1:16.16.1~dfsg-4build1",
"evidence": "/affected/3/versions"
},
{
"value": "1:16.16.1~dfsg+~2.10-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:18.10.0~dfsg+~cs6.10.40431411-2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:20.4.0~dfsg+~cs6.13.40431414-2",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.5.0~dfsg+~cs6.13.40431414-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.5.1~dfsg+~cs6.13.40431414-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.5.2~dfsg+~cs6.13.40431414-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-2",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-2build3",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-2build4",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-2build5",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:22.2.0~dfsg+~cs6.15.60671435-2",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.3.0~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.4.1~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.4.1~dfsg+~cs6.15.60671435-2",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.5.1~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/6/versions"
},
{
"value": "1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu3",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-23738",
"aliases": [
"UBUNTU-CVE-2026-23738"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1:13.1.0~dfsg-1.1ubuntu3",
"1:13.1.0~dfsg-1.1ubuntu4",
"1:13.1.0~dfsg-1.1ubuntu4.1",
"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23738.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-dahdi",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-mobile",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-modules",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-mp3",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-mysql",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-ooh323",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-voicemail",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-voicemail-imapstorage",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-voicemail-odbcstorage",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-vpb",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1:13.17.2~dfsg-1ubuntu1",
"1:13.17.2~dfsg-2ubuntu1",
"1:13.18.1~dfsg-1ubuntu1",
"1:13.18.3~dfsg-1ubuntu1",
"1:13.18.3~dfsg-1ubuntu2",
"1:13.18.3~dfsg-1ubuntu3",
"1:13.18.3~dfsg-1ubuntu4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23738.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-dahdi",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-mobile",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-modules",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-mp3",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-mysql",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-ooh323",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-tests",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-voicemail",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-voicemail-imapstorage",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-voicemail-odbcstorage",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-vpb",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1:16.2.1~dfsg-2build2",
"1:16.2.1~dfsg-2build3",
"1:16.2.1~dfsg-2ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23738.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-dahdi",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-mobile",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-modules",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-mp3",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-mysql",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-ooh323",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-tests",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-voicemail",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-voicemail-imapstorage",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-voicemail-odbcstorage",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-vpb",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1:16.16.1~dfsg-2",
"1:16.16.1~dfsg-4",
"1:16.16.1~dfsg-4build1",
"1:16.16.1~dfsg+~2.10-1",
"1:18.10.0~dfsg+~cs6.10.40431411-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23738.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-dahdi",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-mobile",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-modules",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-mp3",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-mysql",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-ooh323",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-tests",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-vpb",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1:20.4.0~dfsg+~cs6.13.40431414-2",
"1:20.5.0~dfsg+~cs6.13.40431414-1",
"1:20.5.1~dfsg+~cs6.13.40431414-1",
"1:20.5.2~dfsg+~cs6.13.40431414-1",
"1:20.6.0~dfsg+~cs6.13.40431414-1",
"1:20.6.0~dfsg+~cs6.13.40431414-2",
"1:20.6.0~dfsg+~cs6.13.40431414-2build3",
"1:20.6.0~dfsg+~cs6.13.40431414-2build4",
"1:20.6.0~dfsg+~cs6.13.40431414-2build5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23738.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:20.6.0~dfsg+~cs6.13.40431414-2build5"
},
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],
"modified": "2026-10-17T12:58:07.314193350Z",
"provider": "osv",
"upstream": [
"CVE-2026-23738"
],
"references": [
"https://ubuntu.com/security/CVE-2026-23738",
"https://www.cve.org/CVERecord?id=CVE-2026-23738",
"https://github.com/asterisk/asterisk/security/advisories/GHSA-v6hp-wh3r-cwxh"
]
},
"related_cves": [
{
"value": "CVE-2026-23738",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 358147,
"published_at": "2026-02-06T17:16:00+00:00"
}