CVE-2026-123487
ReDoS via email regex in Parse Server causing Node.js event-loop DoS
do firstUpgrade to a fixed release: 9.10.7-alpha.1, 8.6.115.
Is CVE-2026-123487 being exploited?
Not confirmed. CVE-2026-123487 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.
How severe is CVE-2026-123487?
CVE-2026-123487 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-2026-123487?
Yes. A fix has been recorded for CVE-2026-123487. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-123487 affect?
CVE-2026-123487 affects Parse Server < 8.6.115, Parse Server 9.0.0 < 9.10.7-alpha.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-123487?
Upgrade to 8.6.115 or 9.10.7-alpha.1+; enforce email length limits and rate-limit signups/WAF rules.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated or authenticated attacker can submit a long crafted email to trigger regex ReDoS, block the Node.js event loop, and cause service denial.
Patch when possible
- affected>= 9.0.0 and < 9.10.7-alpha.1
- affected< 8.6.115
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.
cisa ssvc
- exploitation
- none
- automatable
- yes
- technical impact
- partial
Assessed by CISA 6 Nov 2026 (SSVC 2.0.3).
timeline
- 6 Nov 2026Published
- 6 Nov 2026CISA SSVC assessment: exploitation none · same day later
- 6 Nov 2026CVE record last updated · same day later
- 7 Nov 2026Analysed by vulneraibility.com · 1 day later
also known as
- Advisorygithub.com /parse-community/parse-server/security/advisories/GHSA-9492-427f-466x
- Advisoryvulncheck.com /advisories/parse-server-9.0.0-before-9.10.7-alpha.1-redos-via-email-validation-
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- OSV: advisory aliases and downstream package versions
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.