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TI-2026-84355 Aliases CVE-2026-121549GHSA-p7pp-h3gc-2v7m

nnn Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins

Priority MEDIUM 52CWE-377Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
Active
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

The jarun nnn file manager through 5.3 uses predictable temporary file paths in /tmp in its pdfread and nuke plugins. A local attacker with low privileges can plant a symlink at one of those paths so that the plugin truncates and overwrites any file the victim can write (CWE-377).

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00109 1st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
jarunnnnup to 5.3—No fix listedCNA
  • nnn Vendorjarun Affected up to 5.3 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for nnn. The sources do not list a workaround.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-121549
  2. 2026-11-03 Alias added: GHSA-p7pp-h3gc-2v7m
  3. 2026-11-04 Affected versions changed · Red Hat
  4. 2026-11-04 CVSS score added · Red Hat
  5. 2026-11-07 CISA SSVC decision points changed
  6. 2026-11-07 Priority changed: LOW → MEDIUM

References

Patch 1

Other 4

  • TI-2026-84354 OS command injection in nnn togglex plugin via crafted filenames CVSS 4.0HIGH 8.4
  • TI-2026-85580 Server-side request forgery in Buku bukuserver reaches internal hosts CVSS 4.0MEDIUM 6.3
  • TI-2026-84450 Stored cross-site scripting in buku bookmark list via bookmark URL CVSS 4.0MEDIUM 5.3
  • TI-2025-12396 jarun nnn nnn.c run_cmd_as_plugin double free CVSS 4.0MEDIUM 4.8
  • TI-2026-84356 Symlink-following write in nnn via NNN_FIFO handling CVSS 4.0LOW 1.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences