nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins
Summary
| CVE | CVE-2026-121549 |
|---|---|
| State | PUBLISHED |
| Assigner | VulnCheck |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-03 16:17:26 UTC |
| Updated | 2026-11-03 16:30:17 UTC |
| Description | nnn through 5.3 contains an insecure temporary file vulnerability in the pdfread and nuke plugins that allows local attackers to overwrite files by exploiting predictable paths in /tmp. Attackers can pre-create a symlink at the name-derived or PID-derived path so the victim's plugin truncates and overwrites any file the victim can write. |
Risk And Classification
Primary CVSS: v4.0 4.1 MEDIUM from [email protected]
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-377 | CWE-377 Insecure Temporary File
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 4.1 | MEDIUM | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 4.1 | MEDIUM | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Primary | 4.4 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N |
| 3.1 | CNA | CVSS | 4.4 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N |
CVSS v4.0 Breakdown
Attack Vector
LocalAttack Complexity
LowAttack Requirements
PresentPrivileges Required
LowUser Interaction
ActiveConfidentiality
NoneIntegrity
HighAvailability
NoneSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
HighPrivileges Required
LowUser Interaction
RequiredScope
UnchangedConfidentiality
NoneIntegrity
HighAvailability
NoneCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff | [email protected] | github.com | |
| github.com/jarun/nnn/blob/v5.3/plugins/pdfread | [email protected] | github.com | |
| github.com/jarun/nnn | [email protected] | github.com | |
| github.com/jarun/nnn/issues/2188 | [email protected] | github.com | |
| github.com/jarun/nnn/blob/v5.3/plugins/nuke | [email protected] | github.com | |
| www.vulncheck.com/advisories/nnn-through-5.3-insecure-temporary-file-symlink-ov... | [email protected] | www.vulncheck.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: George Chen (en)
There are currently no legacy QID mappings associated with this CVE.