CVE catalog

CVE-2026-6390

Severity: Medium · CVSS 6.8CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H
Published: Jul 22, 2026, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.15% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	nano	sid	`9.3-1`	fixed
Debian	nano	forky	`9.2-1`	fixed
Debian	nano	trixie	`8.4-1+deb13u1`	vulnerable
Debian	nano	bookworm	`7.2-1+deb12u1`	vulnerable
Ubuntu	nano	22.04	`5.6.1-1build1`	vulnerable
Ubuntu	nano	22.04	`5.9-1`	vulnerable
Ubuntu	nano	22.04	`6.0-1`	vulnerable
Ubuntu	nano	22.04	`6.1-1`	vulnerable
Ubuntu	nano	22.04	`6.2-1`	vulnerable
Ubuntu	nano	22.04	`6.2-1ubuntu0.1`	vulnerable
Ubuntu	nano	22.04	`6.2-1ubuntu0.2`	fixed
Ubuntu	nano	24.04	`7.2-1`	vulnerable
Ubuntu	nano	24.04	`7.2-2`	vulnerable
Ubuntu	nano	24.04	`7.2-2build1`	vulnerable
Ubuntu	nano	24.04	`7.2-2ubuntu0.1`	vulnerable
Ubuntu	nano	24.04	`7.2-2ubuntu0.2`	fixed
Ubuntu	nano	25.10	`8.3-1`	vulnerable
Ubuntu	nano	25.10	`8.4-1`	vulnerable
Ubuntu	nano	25.10	`8.4-1ubuntu0.1`	fixed
Ubuntu	nano	26.04	`8.4-1`	vulnerable
Ubuntu	nano	26.04	`8.6-1`	vulnerable
Ubuntu	nano	26.04	`8.7-1`	vulnerable
Ubuntu	nano	26.04	`8.7.1-1`	vulnerable
Ubuntu	nano	26.04	`8.7.1-1ubuntu0.1`	fixed
Opensuse	nano	tumbleweed	`9.3-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	nano	source	sid	`9.0-1`	not yet assigned	Not reported	Not reported
Debian	nano	source	forky	`9.0-1`	not yet assigned	Not reported	Not reported
Debian	nano	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	nano	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Ubuntu	nano	deb	22.04	`6.2-1ubuntu0.2`	Not reported	UBUNTU-CVE-2026-6390	Not reported
Ubuntu	nano	deb	24.04	`7.2-2ubuntu0.2`	Not reported	UBUNTU-CVE-2026-6390	Not reported
Ubuntu	nano	deb	25.10	`8.4-1ubuntu0.1`	Not reported	UBUNTU-CVE-2026-6390	Not reported
Ubuntu	nano	deb	26.04	`8.7.1-1ubuntu0.1`	Not reported	UBUNTU-CVE-2026-6390	Not reported
Opensuse	nano	rpm	tumbleweed	`9.3-1.1`	Not reported	OPENSUSE-SU-2026:12247-1	Not reported

Notes

[trixie] nano: Minor issue [bookworm] nano: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[nano]Affected
Details (2)
- 7.2-1+deb12u1 · amd64 · bookworm
  Affected
  nvd · nano · debian · bookworm; nvd · nano · debian · 12
- 7.2-1+deb12u1 · arm64 · bookworm
  Affected
  nvd · nano · debian · bookworm; nvd · nano · debian · 12
[nano-tiny]Affected
Source package: [nano]
Details (2)
- 7.2-1+deb12u1 · amd64 · bookworm
  Affected
  nvd · nano · debian · bookworm; nvd · nano · debian · 12
- 7.2-1+deb12u1 · arm64 · bookworm
  Affected
  nvd · nano · debian · bookworm; nvd · nano · debian · 12

[Debian 13 (Trixie)]

[nano]Affected
Details (2)
- 8.4-1+deb13u1 · amd64 · trixie
  Affected
  nvd · nano · debian · 13
- 8.4-1+deb13u1 · arm64 · trixie
  Affected
  nvd · nano · debian · 13
[nano-tiny]Affected
Source package: [nano]
Details (2)
- 8.4-1+deb13u1 · amd64 · trixie
  Affected
  nvd · nano · debian · 13
- 8.4-1+deb13u1 · arm64 · trixie
  Affected
  nvd · nano · debian · 13

[openSUSE Tumbleweed]

[nano]Affected
Source package: [nano]
Details (1)
- 9.2-1.1 · x86_64 · tumbleweed
  Affected · Fixed: 9.3-1.1
  nvd · nano · opensuse · tumbleweed
[nano-lang]Unknown
Source package: [nano]
Details (1)
- 9.2-1.1 · noarch · tumbleweed
  Unknown · Fixed: 9.3-1.1
  Version impact unknown
  nvd · nano · opensuse · tumbleweed

Observed: Oct 25, 2026, 7:19:44 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]