KEV Lag Tracker → CVE-2026-66384. Data verified against the official CISA KEV catalog and the National Vulnerability Database.
CISA added CVE-2026-66384 (JFrog Artifactory) to the Known Exploited Vulnerabilities catalog on August 27, 2026. It was publicly known for 15 days before CISA confirmed active exploitation. A KEV listing is CISA’s official confirmation that a vulnerability is being exploited in the wild.
The Record
| CVE | CVE-2026-66384 |
| Vendor / product | JFrog Artifactory |
| Vulnerability | JFrog Artifactory Improper Limitation of a Pathname to a Restricted Directory Vulnerability |
| CVSS base score | 5.3 |
| EPSS probability the day before the KEV listing | 0.26% (17.9% percentile) |
| NVD publication date | August 12, 2026 |
| Added to CISA KEV | August 27, 2026 |
| Lag (public → KEV listing) | 15 days |
| Federal patch deadline | September 10, 2026 |
| Known ransomware use | No |
Measured against the 1703 entries in our tracker with verified publication dates, CVE-2026-66384 was flagged faster than 72% of them.
What CISA Reported
CISA describes the flaw as follows: “JFrog Artifactory contains an improper limitation of a pathname to a restricted directory vulnerability. This can allow an authenticated user to write data outside the intended Docker cache path under specific remote-repository conditions.”
Federal Patch Deadline
Under Binding Operational Directive rules, U.S. federal agencies must remediate CVE-2026-66384 by September 10, 2026 — a 14-day remediation window from the KEV listing date. Private organizations are not bound by that deadline; CISA treats it as the benchmark for how urgently a confirmed-exploited flaw should be patched.
What EPSS Forecast Before the Confirmation
The EPSS forecast (FIRST’s daily estimate of the probability a CVE will be exploited within 30 days) put CVE-2026-66384 at 0.26% on the day before CISA confirmed active exploitation — the 17.9% percentile of all scored CVEs that day. That places it outside the top 10% of EPSS risk on the eve of confirmation — a patch queue ordered by EPSS alone would have left it for later.
| EPSS for CVE-2026-66384 | Value |
|---|---|
| Probability the day before the KEV listing | 0.26% |
| Percentile the day before the KEV listing | 17.9% |
| Probability today (September 10, 2026) | 0.58% |
| Percentile today | 45.8% |
Today’s figure is not evidence that the forecast worked: EPSS reacts to the KEV listing itself, so the score for any confirmed-exploited CVE tends to rise after CISA acts. Only the eve-of-listing number was available to a defender making the call. Across every KEV entry we track, we measured how often that number was high — see the EPSS accuracy analysis.
How This Compares
We do not yet track enough JFrog entries to publish a vendor median (the threshold is five with verified publication dates), so the reference here is the catalog as a whole:
| Across all tracked KEV entries | Value |
|---|---|
| Entries with verified publication dates | 1703 |
| Median lag (disclosure → KEV listing) | 260 days |
| Exploited within 7 days of disclosure | 24% |
| Tied to known ransomware campaigns | 19% |
Frequently Asked Questions
What is CVE-2026-66384?
CVE-2026-66384 is a vulnerability in JFrog Artifactory (JFrog Artifactory Improper Limitation of a Pathname to a Restricted Directory Vulnerability) that CISA added to its Known Exploited Vulnerabilities catalog on August 27, 2026. A KEV listing is CISA’s official confirmation that the flaw is being exploited in the wild.
How long was CVE-2026-66384 public before CISA confirmed exploitation?
15 calendar days, measured from its NVD publication date to the date CISA added it to the KEV catalog.
What is the federal patch deadline for CVE-2026-66384?
U.S. federal agencies must remediate CVE-2026-66384 by September 10, 2026, a 14-day window from the KEV listing date. Private organizations are not bound by that deadline, but CISA treats it as the benchmark for how urgently a confirmed-exploited flaw should be patched.
Is CVE-2026-66384 used in ransomware campaigns?
CISA has not flagged CVE-2026-66384 as known to be used in ransomware campaigns. That field reflects confirmed campaign use, not the absence of risk.
What was the EPSS score for CVE-2026-66384 before it was confirmed as exploited?
0.26% — the probability EPSS assigned on the day before CISA added CVE-2026-66384 to the KEV catalog, placing it in the 17.9% percentile of all scored CVEs that day. That is outside the top 10% of EPSS risk. Its score today is higher in most cases because EPSS reacts to the KEV listing itself, so only the eve-of-listing figure reflects what a defender could have acted on.
Is a 15-day lag typical?
The median across all 1703 KEV entries we track with verified publication dates is 260 days, so CVE-2026-66384 is below the catalog median.
Related Coverage
- Critical Microsoft SharePoint Flaw CVE-2026-50522 (CVSS 9.8) Added to CISA KEV (July 2026)
- WordPress’s CVE-2026-63030 Was Exploited in 4 Days — Well Under Its 420-Day Median (July 2026)
Primary Sources
- CISA Known Exploited Vulnerabilities Catalog — the official listing that confirms active exploitation, and the source of the KEV date on this page.
- NVD — CVE-2026-66384 — publication date, CVSS score and the full technical record.
- Vendor advisory — docs.jfrog.com — JFrog’s own disclosure, with the affected versions and the fix.
- Vendor advisory — docs.jfrog.com — JFrog’s own disclosure, with the affected versions and the fix.
How We Track This
This page is generated from our CISA KEV Lag Tracker, which syncs the official CISA KEV catalog daily and records the date each CVE is added. For every entry we retrieve the original NVD publication date and compute the lag in calendar days. No date or figure on this page is estimated or taken from a third-party source — they come directly from CISA and NVD records. Free to cite with attribution to CVEDaily (CC BY 4.0).