CVE-2026-121549
nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Active
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins
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.
- Record
CVE-2026-121549- CVSS 4.0
- 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 - CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N - Weakness
- CWE-377
- Updated
- 2026-11-07
EUVDEUVD-2026-115894
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.
- Record
EUVD-2026-115894- CVSS 4.0
- 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 - Updated
- 2026-11-07
GitHub AdvisoriesGHSA-p7pp-h3gc-2v7m
nnn through 5.3 contains an insecure temporary file vulnerability in the pdfread and nuke plugins...
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.
- Record
GHSA-p7pp-h3gc-2v7m- CVSS 4.0
- 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/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 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N - Weakness
- CWE-377
- Updated
- 2026-11-03
NVD
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.
- Record
CVE-2026-121549- CVSS 4.0
- 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/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 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N - Weakness
- CWE-377
- Updated
- 2026-11-07
OSV
nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins
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.
- Record
CVE-2026-121549- CVSS 4.0
- 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 - Weakness
- CWE-377
- Updated
- 2026-11-05
OSVDEBIAN-CVE-2026-121549
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.
- Record
DEBIAN-CVE-2026-121549- CVSS 4.0
- 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/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 - Updated
- 2026-11-07
OSVUBUNTU-CVE-2026-121549
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.
- Record
UBUNTU-CVE-2026-121549- CVSS 4.0
- 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 - CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N - Updated
- 2026-11-05
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
nnnDebian:12 |
All versions, plus listed versions 4.7-14.8-14.9-15.0-15.1-15.2-15.3-1 |
None known |
nnnDebian:13 |
All versions, plus listed versions 5.0-15.1-15.2-15.3-1 |
None known |
nnnDebian:14 |
All versions, plus listed versions 5.0-15.1-15.2-15.3-1 |
None known |
nnnUbuntu:18.04:LTS |
All versions, plus listed versions 1.3-21.5-11.6-11.7-1 |
None known |
nnnUbuntu:20.04:LTS |
All versions, plus listed versions 2.6-12.7-12.8-12.8.1-12.9-13.0-13.0-2 |
None known |
nnnUbuntu:22.04:LTS |
All versions, plus listed versions 3.5-14.3-1 |
None known |
nnnUbuntu:24.04:LTS |
All versions, plus listed versions 4.8-14.9-14.9-1build14.9-1build2 |
None known |
nnnUbuntu:26.10 |
All versions, plus listed versions 5.1-15.2-15.3-1 |
None known |
nnnUbuntu:26.04:LTS |
All versions, plus listed versions 5.0-15.1-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| references | CVE List, EUVD | |
| affected, aliases, references | OSV | |
| affected, aliases, references | OSV | |
| references | OSV | |
| published | EUVD | |
| published | EUVD | |
| aliases, references | GitHub Advisories, NVD | |
| cwes, facts, references, severity, title | CVE List | |
| first indexed | EUVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-121549 is a medium vulnerability (CVSS 4.1) in Jarun Nnn, published November 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.11%, the 1st percentile. No source names a fixed version.
References
github.com/jarun/nnn/issues/2188
vulncheck.com/advisories/nnn-through-5.3-insecure-temporary-file-symlink-overwrite-via-pdfread-and-nuke-plugins