TI-2026-85949 Aliases CVE-2026-123487 GHSA-r7pw-r949-xvmf

ReDoS in Parse Server email validation blocks the event loop

MEDIUM 44CWE-1333Published 2026-11-06 · Updated 2026-11-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-1333.

Summary

Parse Server before 8.6.115 and from 9.0.0 before 9.10.7-alpha.1 checks user email address format with a regular expression whose run time grows quadratically with input length, and the check has no length limit. An unauthenticated attacker who knows the application ID can send a sign-up request with a long crafted email address, or a logged-in user can do the same by updating their own email, to block the Node.js event loop (CWE-1333). This denies service to all clients.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Parse Server before 8.6.115 and 9.0.0 before 9.10.7-alpha.1 validates user email address format with a regular expression whose run time grows quadratically with input length and that is applied without a length limit. An unauthenticated attacker who knows the application ID can send a sign-up request, or a logged-in user can update their own email, with a long crafted email address to block the Node.js event loop and deny service to all clients.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00383 32nd percentileScored 2026-11-07

Fix Fixed parse-server (parse-community): 9.10.7-alpha.1, 8.6.115

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
parse-community	parse-server	9.0.0 to before 9.10.7-alpha.1	9.10.7-alpha.1	Patch available	CNA
parse-community	parse-server	before 8.6.115	8.6.115	Patch available	CNA

parse-server Vendorparse-community Affected 9.0.0 to before 9.10.7-alpha.1 Fixed in 9.10.7-alpha.1 Patch available CNA
parse-server Vendorparse-community Affected before 8.6.115 Fixed in 8.6.115 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:parseplatform:parse-server::::::::	—	—	parse-community

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:*:*:* Versions — — ·parse-community

Remediation

Upgrade Parse Server to 8.6.115 for the 8.x line and to 9.10.7-alpha.1 for the 9.x line.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA parse-server (parse-community) Fixed in 9.10.7-alpha.1
Fix · CNA parse-server (parse-community) Fixed in 8.6.115

Timeline

2026-11-06 Threatist record created from CVE-2026-123487
2026-11-06 Alias added: GHSA-r7pw-r949-xvmf
2026-11-06 CISA SSVC decision points changed

References

Advisory 1

GitHub Security Advisory (GHSA-9492-427f-466x)

TI-2022-08574 Command Injection in Parse server CVSS 3.1CRITICAL 10.0
TI-2024-18136 Parse Server literalizeRegexPart SQL Injection CVSS 3.1CRITICAL 10.0
TI-2022-18768 Parse Server vulnerable to Remote Code Execution via prototype pollution in MongoDB BSON parser CVSS 3.1CRITICAL 9.8
TI-2024-31550 Parse Server's custom object ID allows to acquire role privileges CVSS 3.1HIGH 8.1
TI-2025-35510 parse is a package designed to parse JavaScript SDK. CVSS 3.1MEDIUM 6.5
TI-2024-26265 ZDI-CAN-23894: Parse Server literalizeRegexPart SQL Injection Authentication Bypass Vulnerability CVSS 3.1CRITICAL 9.8

See all 158 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences