Apollo Router Operation Limits Vulnerable to Bypass via Integer Overflow

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

• CVE-2025-32033: 0.60% estimated exploitation activity in the next 30 days; percentile 48.56 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact Summary A vulnerability in Apollo Router allowed certain queries to bypass configured operation limits, specifically due to integer overflow. Details 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. Fix/Mitigation Logic was updated to ensure counter overflow is handled correctly and does not wrap around to 0. Patches This has been remediated in apollo-router versions 1.61.2 and 2.1.1. Workarounds The only known workaround is "Safelisting" or "Safelisting with IDs only" per Safelisting with Persisted Queries - Apollo GraphQL Docs. Acknowledgements We appreciate the efforts of the…

Published by the source

7 Apr 2025, 18:59 UTC

Last modified by the source

8 Apr 2025, 17:51 UTC

Source last checked

26 Oct 2026, 15:38 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-84m6-5m72-45fp

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# Patch Next advisory brief: CVE-2025-32033

Advisory: Apollo Router Operation Limits Vulnerable to Bypass via Integer Overflow
IDs: CVE-2025-32033, GHSA-84m6-5m72-45fp
Record: https://patchnext.com/advisories/cve-2025-32033 (revision 1, source checked 26 Oct 2026, 15:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: apollo-router 2.1.1, 1.61.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io apollo-router: affected < 1.61.2; >= 2.0.0-alpha.0, < 2.1.1; fixed in 1.61.2, 2.1.1

## Suggested inspection (read-only)
- crates.io apollo-router: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on apollo-router.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-84m6-5m72-45fp (GitHub-reviewed advisory GHSA-84m6-5m72-45fp lists affected ranges: crates.io apollo-router >=0 =2.0.0-alpha.0 <2.1.1)

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