HighFix available
munge — security advisory
MUNGE is an authentication service for creating and validating user credentials. From 0.5 to 0.5.17, local attacker can exploit a buffer overflow vulnerability in munged (the MUNGE authentication daemon) to leak cryptographic key material from process memory. With the leaked key material, the attacker could forge arbitrary MUNGE credentials to impersonate any user (including root) to services that rely on MUNGE for authentication. The vulnerability allows a buffer overflow by sending a crafted message with an oversized address length field, corrupting munged's internal state and enabling extraction of the MAC subkey used for credential verification. This vulnerability is fixed in 0.5.18.
- Products
- munge
- Affected versions
- 0.5.10-1, 0.5.10-1ubuntu1, 0.5.11-1, 0.5.11-1ubuntu1, 0.5.11-1ubuntu1.1, 0.5.11-3, 0.5.11-3ubuntu0.1, 0.5.12-2, 0.5.13-1, 0.5.13-2build1, 0.5.14-6, 0.5.15-2, 0.5.15-3ubuntu1, 0.5.15-4, 0.5.15-4build1, 0.5.16-1
- Fixed versions
- 0.5.11-1ubuntu1.1+esm1, 0.5.11-3ubuntu0.1+esm1, 0.5.13-1ubuntu0.1~esm1, 0.5.13-2ubuntu0.1~esm1, 0.5.14-6ubuntu0.1, 0.5.15-4ubuntu0.1, 0.5.16-1ubuntu0.1
- CVEs
- CVE-2026-25506
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:18 UTC · Revision 1
Source evidence
MUNGE is an authentication service for creating and validating user credentials. From 0.5 to 0.5.17, local attacker can exploit a buffer overflow vulnerability in munged (the MUNGE authentication daemon) to leak cryptographic key material from process memory. With the leaked key material, the attacker could forge arbitrary MUNGE credentials to impersonate any user (including root) to services that rely on MUNGE for authentication. The vulnerability allows a buffer overflow by sending a crafted message with an oversized address length field, corrupting munged's internal state and enabling extraction of the MAC subkey used for credential verification. This vulnerability is fixed in 0.5.18.
osv:UBUNTU-CVE-2026-25506
munge
Fixed versions: 0.5.11-1ubuntu1.1+esm1
munge
Fixed versions: 0.5.11-3ubuntu0.1+esm1
munge
Fixed versions: 0.5.13-1ubuntu0.1~esm1
munge
Fixed versions: 0.5.13-2ubuntu0.1~esm1
munge
Fixed versions: 0.5.14-6ubuntu0.1
munge
Fixed versions: 0.5.15-4ubuntu0.1
munge
Fixed versions: 0.5.16-1ubuntu0.1
Complete source record
{
"id": "2e38c83ea04ab6d41865050f8ab89fc02c2e4f12d5021c39bc5603ecf881ebf1",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-25506",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-25506",
"summary": "MUNGE is an authentication service for creating and validating user credentials. From 0.5 to 0.5.17, local attacker can exploit a buffer overflow vulnerability in munged (the MUNGE authentication daemon) to leak cryptographic key material from process memory. With the leaked key material, the attacker could forge arbitrary MUNGE credentials to impersonate any user (including root) to services that rely on MUNGE for authentication. The vulnerability allows a buffer overflow by sending a crafted message with an oversized address length field, corrupting munged's internal state and enabling extraction of the MAC subkey used for credential verification. This vulnerability is fixed in 0.5.18.",
"evidence": "osv:UBUNTU-CVE-2026-25506",
"products": [
{
"name": {
"value": "munge",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
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{
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"evidence": "/affected/0/ranges"
}
],
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{
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{
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"name": {
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{
"value": "0.5.13-2build1",
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{
"name": {
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{
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],
"affected_versions": [
{
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},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.5.15-4ubuntu0.1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "0.5.15-2",
"evidence": "/affected/5/versions"
},
{
"value": "0.5.15-3ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "0.5.15-4",
"evidence": "/affected/5/versions"
},
{
"value": "0.5.15-4build1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "munge",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.5.16-1ubuntu0.1",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "0.5.16-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-25506",
"aliases": [
"UBUNTU-CVE-2026-25506"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.11-1ubuntu1.1+esm1"
}
]
}
],
"package": {
"name": "munge",
"purl": "pkg:deb/ubuntu/munge?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"0.5.10-1",
"0.5.10-1ubuntu1",
"0.5.11-1",
"0.5.11-1ubuntu1",
"0.5.11-1ubuntu1.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25506.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmunge2",
"binary_version": "0.5.11-1ubuntu1.1+esm1"
},
{
"binary_name": "munge",
"binary_version": "0.5.11-1ubuntu1.1+esm1"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.11-3ubuntu0.1+esm1"
}
]
}
],
"package": {
"name": "munge",
"purl": "pkg:deb/ubuntu/munge?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"0.5.11-3",
"0.5.11-3ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25506.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmunge2",
"binary_version": "0.5.11-3ubuntu0.1+esm1"
},
{
"binary_name": "munge",
"binary_version": "0.5.11-3ubuntu0.1+esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.13-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "munge",
"purl": "pkg:deb/ubuntu/munge?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"0.5.12-2",
"0.5.13-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25506.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmunge2",
"binary_version": "0.5.13-1ubuntu0.1~esm1"
},
{
"binary_name": "munge",
"binary_version": "0.5.13-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.13-2ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "munge",
"purl": "pkg:deb/ubuntu/munge?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"0.5.13-2build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25506.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmunge2",
"binary_version": "0.5.13-2ubuntu0.1~esm1"
},
{
"binary_name": "munge",
"binary_version": "0.5.13-2ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
},
{
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}
],
"package": {
"name": "munge",
"purl": "pkg:deb/ubuntu/munge?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.5.14-6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25506.json"
},
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"binaries": [
{
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{
"binary_name": "munge",
"binary_version": "0.5.14-6ubuntu0.1"
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],
"availability": "No subscription required"
}
},
{
"ranges": [
{
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"introduced": "0"
},
{
"fixed": "0.5.15-4ubuntu0.1"
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}
],
"package": {
"name": "munge",
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"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.5.15-2",
"0.5.15-3ubuntu1",
"0.5.15-4",
"0.5.15-4build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25506.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "munge",
"binary_version": "0.5.15-4ubuntu0.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.16-1ubuntu0.1"
}
]
}
],
"package": {
"name": "munge",
"purl": "pkg:deb/ubuntu/munge?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"0.5.16-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25506.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmunge2",
"binary_version": "0.5.16-1ubuntu0.1"
},
{
"binary_name": "munge",
"binary_version": "0.5.16-1ubuntu0.1"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-27T04:17:51.791679198Z",
"provider": "osv",
"upstream": [
"CVE-2026-25506"
],
"references": [
"https://ubuntu.com/security/CVE-2026-25506",
"https://www.cve.org/CVERecord?id=CVE-2026-25506",
"https://github.com/dun/munge/security/advisories/GHSA-r9cr-jf4v-75gh",
"https://github.com/dun/munge/commit/bf40cc27c4ce8451d4b062c9de0b67ec40894812",
"https://github.com/dun/munge/releases/tag/munge-0.5.18",
"https://ubuntu.com/security/notices/USN-8040-1"
]
},
"related_cves": [
{
"value": "CVE-2026-25506",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/2/score"
},
"source_id": "core-osv",
"document_id": 460309,
"published_at": "2026-02-10T19:16:00+00:00"
}