CVE-2026-121550: jarun nnn

nnn through 5.3 Symlink-Following Write via NNN_FIFO Handling

CVSS 1.0 LowEPSS 0.0012 · 1st percentile

Published by the CVE Program (CNA: VulnCheck) at 3 Nov 2026, 15:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
jarun	nnn	affected 5.3 and earlier custom Other versions: unaffected

Identifiers

CVE-2026-121550

CNA

VulnCheck

Weakness (CWE)

CWE-59

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
1.0	Low	4.0	CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
3.3	Low	3.1	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0012, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

3 Nov 2026, 15:17 UTC Confirmed by the CVE List
3 Nov 2026, 15:23 UTC First seen by agentprime
3 Nov 2026, 16:17 UTC Confirmed by NVD

Sources

References from the CNA

github.com/jarun/nnn/issues/2188 issue-tracking
github.com/jarun/nnn product
github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff patch
github.com/jarun/nnn/blob/v5.3/src/nnn.c#L10635 technical-description
github.com/jarun/nnn/blob/v5.3/src/nnn.c#L7433 technical-description
www.vulncheck.com/advisories/nnn-through-5.3-symlink-following-write-via-nnn-fifo-handling third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.