CVE-2026-47138
Unauthenticated requests cause CPU backtracking in Parse Server header parser.
Is CVE-2026-47138 being exploited?
Not confirmed. CVE-2026-47138 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 0.58% probability of exploitation in the next 30 days.
How severe is CVE-2026-47138?
CVE-2026-47138 is rated High with a CVSS score of 8.7. 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-2026-47138?
Yes. A fix has been recorded for CVE-2026-47138. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-47138 affect?
CVE-2026-47138 affects Parse Server, Node.js deployments hosting Parse Server. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-47138?
Upgrade to 8.6.77 or 9.9.1-alpha.1
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Denial-of-service via CPU exhaustion on Node.js workers; occurs before auth.
Patch when possible
- affected< 8.6.77
- affected>= 9.0.0 and < 9.9.1-alpha.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.