High
netatalk — security advisory
Netatalk is a Free and Open Source file server suite for Unix-like operating systems. In versions 3.1.19 through 4.4.2, a stack-based buffer overflow exists in the copydir() function of Netatalk's afpd daemon due to an integer underflow in the calculation of the remaining buffer size used for path construction. copydir() is a utility function called when a file operation crosses a device boundary inside an AFP shared volume, which the standard library's renameat() cannot handle. The function attempts to track available buffer space using srem and drem for source and destination paths. Incorrect arithmetic causes both srem and drem to underflow to SIZE_MAX. Consequently, boundary checks against strlen(de->d_name) always pass, allowing strcpy() to append filenames into nearly full stack buffers. Version 4.4.3 patches the issue. As a workaround, configure each AFP shared volume to be structured as a single file system, in other words no subdirectory of a shared volume should be a mount point for a different file system.
- Products
- netatalk
- Affected versions
- 2.2.2-1ubuntu1, 2.2.2-1ubuntu2, 2.2.2-1ubuntu2.2, 2.2.2-1ubuntu2.2+esm1, 2.2.2-1ubuntu2.2+esm2, 2.2.2-1ubuntu2.2+esm3, 2.2.2-1ubuntu2.2+esm4, 2.2.5-1, 2.2.5-1ubuntu0.2, 2.2.5-1ubuntu0.2+esm1, 2.2.5-1ubuntu0.2+esm2, 2.2.5-1ubuntu0.2+esm3, 2.2.5-1ubuntu0.2+esm4, 2.2.6-1, 2.2.6-1ubuntu0.18.04.2, 2.2.6-1ubuntu0.18.04.2+esm1, 2.2.6-1ubuntu0.18.04.2+esm2, 2.2.6-1ubuntu0.18.04.2+esm3, 2.2.6-1ubuntu0.18.04.2+esm4, 3.1.12~ds-3, 3.1.12~ds-4, 3.1.12~ds-4ubuntu0.20.04.1, 3.1.12~ds-4ubuntu0.20.04.3, 3.1.12~ds-4ubuntu0.20.04.3+esm1, 3.1.12~ds-4ubuntu0.20.04.4, 3.1.12~ds-4ubuntu0.20.04.4+esm1, 3.1.12~ds-4ubuntu0.20.04.4+esm2, 3.1.12~ds-9, 3.1.12~ds-9build1, 3.1.12~ds-9ubuntu0.22.04.1, 3.1.12~ds-9ubuntu0.22.04.3, 3.1.12~ds-9ubuntu0.22.04.3+esm1, 3.1.12~ds-9ubuntu0.22.04.4, 3.1.12~ds-9ubuntu0.22.04.4+esm1, 3.1.12~ds-9ubuntu0.22.04.4+esm2, 3.1.15~ds-1ubuntu1, 3.1.18~ds-1, 3.1.18~ds-1build2, 3.1.18~ds-1build4, 3.1.18~ds-1ubuntu0.1~esm1, 3.1.18~ds-1ubuntu0.1~esm2, 3.1.18~ds-1ubuntu0.1~esm3, 4.1.2~ds-4, 4.2.1~ds-1, 4.2.3~ds-1, 4.2.3~ds-2, 4.2.3~ds-2.1, 4.2.3~ds-2.1ubuntu0.1, 4.2.3~ds-2.1ubuntu0.2, 4.4.3~ds-1, 4.5.0~ds-3, 4.5.1~ds-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45699
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:14 UTC · Revision 1
Source evidence
Netatalk is a Free and Open Source file server suite for Unix-like operating systems. In versions 3.1.19 through 4.4.2, a stack-based buffer overflow exists in the copydir() function of Netatalk's afpd daemon due to an integer underflow in the calculation of the remaining buffer size used for path construction. copydir() is a utility function called when a file operation crosses a device boundary inside an AFP shared volume, which the standard library's renameat() cannot handle. The function attempts to track available buffer space using srem and drem for source and destination paths. Incorrect arithmetic causes both srem and drem to underflow to SIZE_MAX. Consequently, boundary checks against strlen(de->d_name) always pass, allowing strcpy() to append filenames into nearly full stack buffers. Version 4.4.3 patches the issue. As a workaround, configure each AFP shared volume to be structured as a single file system, in other words no subdirectory of a shared volume should be a mount point for a different file system.
osv:UBUNTU-CVE-2026-45699
netatalk
Fixed versions: Not specified
netatalk
Fixed versions: Not specified
netatalk
Fixed versions: Not specified
netatalk
Fixed versions: Not specified
netatalk
Fixed versions: Not specified
netatalk
Fixed versions: Not specified
netatalk
Fixed versions: Not specified
netatalk
Fixed versions: Not specified
netatalk
Fixed versions: Not specified
Complete source record
{
"id": "972018bc26b8adf9155535b2634be978d6cee24454ebe133ad1d8b02b9a02d48",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-45699",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-45699",
"summary": "Netatalk is a Free and Open Source file server suite for Unix-like operating systems. In versions 3.1.19 through 4.4.2, a stack-based buffer overflow exists in the copydir() function of Netatalk's afpd daemon due to an integer underflow in the calculation of the remaining buffer size used for path construction. copydir() is a utility function called when a file operation crosses a device boundary inside an AFP shared volume, which the standard library's renameat() cannot handle. The function attempts to track available buffer space using srem and drem for source and destination paths. Incorrect arithmetic causes both srem and drem to underflow to SIZE_MAX. Consequently, boundary checks against strlen(de->d_name) always pass, allowing strcpy() to append filenames into nearly full stack buffers. Version 4.4.3 patches the issue. As a workaround, configure each AFP shared volume to be structured as a single file system, in other words no subdirectory of a shared volume should be a mount point for a different file system.",
"evidence": "osv:UBUNTU-CVE-2026-45699",
"products": [
{
"name": {
"value": "netatalk",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.2-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.2-1ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.2-1ubuntu2.2",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.2-1ubuntu2.2+esm1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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}
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"evidence": "/affected/1/versions"
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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{
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{
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{
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{
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{
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},
{
"name": {
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
},
{
"value": "3.1.12~ds-4",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.12~ds-4ubuntu0.20.04.1",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.12~ds-4ubuntu0.20.04.3",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.12~ds-4ubuntu0.20.04.3+esm1",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.12~ds-4ubuntu0.20.04.4",
"evidence": "/affected/3/versions"
},
{
"value": "3.1.12~ds-4ubuntu0.20.04.4+esm1",
"evidence": "/affected/3/versions"
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{
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{
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{
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"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
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{
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{
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{
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"evidence": "/affected/4/versions"
},
{
"value": "3.1.12~ds-9ubuntu0.22.04.4+esm1",
"evidence": "/affected/4/versions"
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{
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}
]
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{
"name": {
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},
"prerequisites": [],
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{
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"evidence": "/affected/5/versions"
},
{
"value": "3.1.18~ds-1",
"evidence": "/affected/5/versions"
},
{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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{
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{
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{
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{
"value": "4.4.3~ds-1",
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{
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{
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"evidence": "/affected/8/versions"
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{
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{
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{
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-45699",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
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],
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},
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"3.1.18~ds-1",
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"3.1.18~ds-1ubuntu0.1~esm3"
],
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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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],
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},
"ecosystem_specific": {
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{
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"binary_version": "4.2.3~ds-1"
},
{
"binary_name": "atalkd",
"binary_version": "4.2.3~ds-1"
},
{
"binary_name": "libatalk",
"binary_version": "4.2.3~ds-1"
},
{
"binary_name": "macipgw",
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},
{
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},
{
"binary_name": "netatalk-tests",
"binary_version": "4.2.3~ds-1"
},
{
"binary_name": "netatalk-tools",
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},
{
"binary_name": "papd",
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},
{
"binary_name": "timelord",
"binary_version": "4.2.3~ds-1"
}
]
}
},
{
"ranges": [
{
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"events": [
{
"introduced": "0"
}
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}
],
"package": {
"name": "netatalk",
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"ecosystem": "Ubuntu:26.10"
},
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"4.2.3~ds-2.1",
"4.4.3~ds-1",
"4.5.0~ds-3",
"4.5.1~ds-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45699.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "a2boot",
"binary_version": "4.5.1~ds-1"
},
{
"binary_name": "atalkd",
"binary_version": "4.5.1~ds-1"
},
{
"binary_name": "libatalk",
"binary_version": "4.5.1~ds-1"
},
{
"binary_name": "macipgw",
"binary_version": "4.5.1~ds-1"
},
{
"binary_name": "netatalk",
"binary_version": "4.5.1~ds-1"
},
{
"binary_name": "netatalk-tests",
"binary_version": "4.5.1~ds-1"
},
{
"binary_name": "netatalk-tools",
"binary_version": "4.5.1~ds-1"
},
{
"binary_name": "papd",
"binary_version": "4.5.1~ds-1"
},
{
"binary_name": "timelord",
"binary_version": "4.5.1~ds-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netatalk",
"purl": "pkg:deb/ubuntu/netatalk?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"4.2.3~ds-1",
"4.2.3~ds-2",
"4.2.3~ds-2.1",
"4.2.3~ds-2.1ubuntu0.1",
"4.2.3~ds-2.1ubuntu0.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45699.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "a2boot",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
},
{
"binary_name": "atalkd",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
},
{
"binary_name": "libatalk",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
},
{
"binary_name": "macipgw",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
},
{
"binary_name": "netatalk",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
},
{
"binary_name": "netatalk-tests",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
},
{
"binary_name": "netatalk-tools",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
},
{
"binary_name": "papd",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
},
{
"binary_name": "timelord",
"binary_version": "4.2.3~ds-2.1ubuntu0.2"
}
]
}
}
],
"modified": "2026-10-17T12:58:22.769104467Z",
"provider": "osv",
"upstream": [
"CVE-2026-45699"
],
"references": [
"https://ubuntu.com/security/CVE-2026-45699",
"https://www.cve.org/CVERecord?id=CVE-2026-45699",
"https://netatalk.io/security/CVE-2026-45699"
]
},
"related_cves": [
{
"value": "CVE-2026-45699",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 358629,
"published_at": "2026-08-14T19:17:00+00:00"
}