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CVE-2026-40556 (GCVE-0-2026-40556)
Vulnerability from cvelistv5 – Published: 2026-04-28 13:54 – Updated: 2026-04-29 07:17
VLAI
EPSS
VEX
This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Replaced by CVE-2026-6842
Show details on NVD website{
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FKIE_CVE-2026-40556
Vulnerability from fkie_nvd - Published: 2026-04-28 15:16 - Updated: 2026-04-29 08:16
Severity
Summary
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
References
| URL | Tags |
|---|
Impacted products
| Vendor | Product | Version |
|---|
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GHSA-9G7J-RCQF-CPCX
Vulnerability from github – Published: 2026-04-28 15:30 – Updated: 2026-04-29 09:30
VLAI
Details
GNU nano creates the user’s ~/.local directory with overly permissive permissions when the directory does not exist yet. On first use of features requiring Cross-Desktop Group (XDG) data storage, nano explicitly requests directory mode 0777, making the directory world‑writable in environments where the process umask does not sufficiently restrict permissions. In systems with a relaxed or zero umask, such as container environments, CI/CD runners, embedded systems, or user shells configured with umask 000, this results in ~/.local being created as world‑writable. A local attacker can exploit a race window between nano’s creation of ~/.local and its subsequent creation of more restrictive subdirectories to write attacker‑controlled files into the victim’s XDG directory hierarchy.
This problem was fixed in nano version 9.0
Severity
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"modified": "2026-04-29T09:30:23Z",
"published": "2026-04-28T15:30:51Z",
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MSRC_CVE-2026-40556
Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-29 01:07Summary
Insecure Directory Permissions in GNU nano Leading to Privilege Abuse
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
CWE-732
- Incorrect Permission Assignment for Critical Resource
Affected products
Under investigation
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 17084-1 | — |
References
4 references
| URL | Category |
|---|---|
| https://msrc.microsoft.com/csaf/vex/2026/msrc_cve… | self |
| https://support.microsoft.com/lifecycle | external |
| https://www.first.org/cvss | external |
| https://msrc.microsoft.com/csaf/vex/2026/msrc_cve… | self |
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OPENSUSE-SU-2026:11120-1
Vulnerability from csaf_opensuse - Published: 2026-06-25 00:00 - Updated: 2026-06-25 00:00Summary
nano-9.1-1.1 on GA media
Severity
Moderate
Notes
Title of the patch: nano-9.1-1.1 on GA media
Description of the patch: These are all security issues fixed in the nano-9.1-1.1 package on the GA media of openSUSE Tumbleweed.
Patchnames: openSUSE-Tumbleweed-2026-11120
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
Affected products
Recommended
8 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Tumbleweed:nano-9.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:nano-9.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:nano-9.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:nano-9.1-1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:nano-lang-9.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:nano-lang-9.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:nano-lang-9.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:nano-lang-9.1-1.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
moderate
References
5 references
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"category": "external",
"summary": "SUSE Bug 1263437 for CVE-2026-40556",
"url": "https://bugzilla.suse.com/1263437"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"openSUSE Tumbleweed:nano-9.1-1.1.aarch64",
"openSUSE Tumbleweed:nano-9.1-1.1.ppc64le",
"openSUSE Tumbleweed:nano-9.1-1.1.s390x",
"openSUSE Tumbleweed:nano-9.1-1.1.x86_64",
"openSUSE Tumbleweed:nano-lang-9.1-1.1.aarch64",
"openSUSE Tumbleweed:nano-lang-9.1-1.1.ppc64le",
"openSUSE Tumbleweed:nano-lang-9.1-1.1.s390x",
"openSUSE Tumbleweed:nano-lang-9.1-1.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-06-25T00:00:00Z",
"details": "moderate"
}
],
"title": "CVE-2026-40556"
}
]
}
ubuntu-cve-2026-40556
Vulnerability from osv_ubuntu
Published
2026-04-29 00:00
Modified
2026-04-29 00:00
Summary
Details
(GNU nano creates the user\u2019s ~/.local directory with overly permis ...)
Severity
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nano",
"binary_version": "2.2.6-1ubuntu1+esm1"
},
{
"binary_name": "nano-tiny",
"binary_version": "2.2.6-1ubuntu1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@2.2.6-1ubuntu1+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.6-1ubuntu1",
"2.2.6-1ubuntu1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nano",
"binary_version": "2.5.3-2ubuntu2+esm1"
},
{
"binary_name": "nano-tiny",
"binary_version": "2.5.3-2ubuntu2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@2.5.3-2ubuntu2+esm1?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.2-1",
"2.4.2-1ubuntu1",
"2.4.3-1",
"2.5.0-1",
"2.5.1-1",
"2.5.2-1",
"2.5.3-2",
"2.5.3-2ubuntu1",
"2.5.3-2ubuntu2",
"2.5.3-2ubuntu2+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nano",
"binary_version": "2.9.3-2ubuntu0.1~esm1"
},
{
"binary_name": "nano-tiny",
"binary_version": "2.9.3-2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@2.9.3-2ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.8.6-3",
"2.8.7-1",
"2.9.0-1",
"2.9.1-1",
"2.9.2-1",
"2.9.3-1",
"2.9.3-2",
"2.9.3-2ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nano",
"binary_version": "4.8-1ubuntu1.1"
},
{
"binary_name": "nano-tiny",
"binary_version": "4.8-1ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@4.8-1ubuntu1.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.3-1",
"4.5-1",
"4.7-1",
"4.7-2",
"4.8-1",
"4.8-1ubuntu1",
"4.8-1ubuntu1.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nano",
"binary_version": "6.2-1ubuntu0.1"
},
{
"binary_name": "nano-tiny",
"binary_version": "6.2-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@6.2-1ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.6.1-1build1",
"5.9-1",
"6.0-1",
"6.1-1",
"6.2-1",
"6.2-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nano",
"binary_version": "7.2-2ubuntu0.1"
},
{
"binary_name": "nano-tiny",
"binary_version": "7.2-2ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@7.2-2ubuntu0.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.2-1",
"7.2-2",
"7.2-2build1",
"7.2-2ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nano",
"binary_version": "8.4-1"
},
{
"binary_name": "nano-tiny",
"binary_version": "8.4-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@8.4-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.3-1",
"8.4-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nano",
"binary_version": "8.7.1-1"
},
{
"binary_name": "nano-tiny",
"binary_version": "8.7.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04",
"name": "nano",
"purl": "pkg:deb/ubuntu/nano@8.7.1-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.4-1",
"8.6-1",
"8.7-1",
"8.7.1-1"
]
}
],
"aliases": [],
"details": "(GNU nano creates the user\\u2019s ~/.local directory with overly permis ...)",
"id": "UBUNTU-CVE-2026-40556",
"modified": "2026-04-29T00:00:00Z",
"published": "2026-04-29T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-40556"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-40556"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-40556"
],
"withdrawn": "2026-05-14T11:40:57Z"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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