Improper Handling of Highly Compressed Data (Data Amplification) in github.com/getkin/kin-openapi/openapi3filter

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-2025-30153: 0.62% estimated exploitation activity in the next 30 days; percentile 49.80 (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.

Summary When validating a request with a multipart/form-data schema, if the OpenAPI schema allows it, an attacker can upload a crafted ZIP file (e.g., a ZIP bomb), causing the server to consume all available system memory. Details The root cause comes from the ZipFileBodyDecoder, which is registered automatically by the module (contrary to what the documentation says. PoC To reproduce the vulnerability, you can use the following OpenAPI schema: And this code to validate the request (nothing fancy, it basically only calls the openapi3filter.ValidateRequest function): We also need to create a zip bomb. This command will create a 4.7GB file and compress it to to 4.7MB zip archive: Run the PoC provided, and upload the zip bomb with curl localhost:8080/ -F file="@/tmp/bomb.zip;type=application/zip" -v. Observe the memory consumption of the test server during and after the upload (it jumped to a bit over 22GB in my testing, with only a 4.7MB input file, you can reduce the size of the…

Published by the source

19 Mar 2025, 18:12 UTC

Last modified by the source

15 May 2025, 16:44 UTC

Source last checked

26 Oct 2026, 15:09 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-wq9g-9vfc-cfq9

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# Patch Next advisory brief: CVE-2025-30153

Advisory: Improper Handling of Highly Compressed Data (Data Amplification) in github.com/getkin/kin-openapi/openapi3filter
IDs: CVE-2025-30153, GHSA-wq9g-9vfc-cfq9
Record: https://patchnext.com/advisories/cve-2025-30153 (revision 1, source checked 26 Oct 2026, 15:09 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: github.com/getkin/kin-openapi 0.131.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/getkin/kin-openapi: affected < 0.131.0; fixed in 0.131.0

## Suggested inspection (read-only)
- Go github.com/getkin/kin-openapi: 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 github.com/getkin/kin-openapi.
- 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-wq9g-9vfc-cfq9 (GitHub-reviewed advisory GHSA-wq9g-9vfc-cfq9 lists affected ranges: Go github.com/getkin/kin-openapi >=0 <0.131.0)

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