CVE-2026-6390— Nano: gnu nano: arbitrary memory writes, information disclosure, or denial of service via format string vulnerability in error handling.
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
GNU nano是美国GNU基金会开源的一个命令行文本编辑器。 GNU nano存在格式化字符串错误漏洞，该漏洞源于GNU nano的多缓冲区错误消息处理中存在格式字符串漏洞，当用户在启动时打开多个文件且其中一个触发ALERT级错误时，包含printf格式说明符的特制文件名可能被重新解释，导致栈信息泄露、拒绝服务或内存写入。
Possible ATT&CK Techniques 2 AI
T1003 · OS Credential Dumping T1059 · Command and Scripting InterpreterAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 7 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
affected |
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I. Basic Information for CVE-2026-6390
Vulnerability Information
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Vulnerability Title
Nano: gnu nano: arbitrary memory writes, information disclosure, or denial of service via format string vulnerability in error handling.
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in GNU nano's multi-buffer error message handling. When a user opens multiple files at startup and one triggers an ALERT-level error, a specially crafted filename containing printf format specifiers can be reinterpreted. This format string vulnerability may allow an attacker to achieve stack information disclosure, cause a denial of service (crash), or potentially perform arbitrary memory writes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部控制的格式字符串
Source: CVE Program / CVE List V5
Vulnerability Title
GNU nano 格式化字符串错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU nano是美国GNU基金会开源的一个命令行文本编辑器。 GNU nano存在格式化字符串错误漏洞，该漏洞源于GNU nano的多缓冲区错误消息处理中存在格式字符串漏洞，当用户在启动时打开多个文件且其中一个触发ALERT级错误时，包含printf格式说明符的特制文件名可能被重新解释，导致栈信息泄露、拒绝服务或内存写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2026-6390
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-6390 (2)
Same Patch Batch · Red Hat · 2026-07-23 · 4 CVEs total
| CVE-2026-16745 | 8.8 HIGH | Odh-dashboard: odh-dashboard: backend port 8080 trusts x-forwarded-access-token without or |
| CVE-2026-64611 | 7.5 HIGH | Libcupsfilters: cups-filters: libcupsfilters: cpu exhaustion via infinite loop in cfieee12 |
| CVE-2026-12353 | 5.3 MEDIUM | Rhcs: memory leak during https connection leads to denial of service |
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V. Comments for CVE-2026-6390
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