CVE-2026-76844
Path traversal in webpack-dev-middleware allows reading files outside the output directory.
Is CVE-2026-76844 being exploited?
Not confirmed. CVE-2026-76844 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-76844?
CVE-2026-76844 is rated High with a CVSS score of 8.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-76844?
Yes. A fix has been recorded for CVE-2026-76844. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-76844 affect?
CVE-2026-76844 affects webpack-dev-middleware (releases from 5.3.4, 6.1.2, 7.1.0 and onward), Apps using writeToDisk=true or custom outputFileSystem. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76844?
Update to vendor patch when available; disable writeToDisk and avoid exposing dev middleware.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local file disclosure (read files one directory up) via crafted URL when middleware uses the physical filesystem (writeToDisk or custom outputFileSystem).
Immediate action required
- affected<= 5.3.4
- affected>= 6.1.2 and <= 6.1.3
- affected>= 7.1.0 and <= 7.4.5
- affected>= 8.0.0 and <= 8.1.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.