6.8

CVE-2026-6390: nano

CVSS: 6.8v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-6390DEBIAN-CVE-2026-6390
Published 23-07-2026Last modified 01-09-2026
Open JSON

Vulnerability summary

CVE-2026-6390 is a medium (CVSS 6.8) vulnerability in nano. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.1% of scored vulnerabilities.

Overall risk
27/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 23-07-2026
    PublishedVulnerability first disclosed.
  2. 01-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

0.00 pp

From 0.15% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • nanoAll versions (No fix recorded) | < 9.0-1
Ubuntu1 product
  • nano< 6.2-1ubuntu0.2 | < 7.2-2ubuntu0.2 | < 8.4-1ubuntu0.1 | < 8.7.1-1ubuntu0.1

2 vendors · 2 products

References

5 links