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Medium, CVSS 5.9

Okio Signed to Unsigned Conversion Error vulnerability

CVE-2023-3635GHSA-w33c-445m-f8w7

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (com.squareup.okio:okio 3.4.0, 1.17.6; com.squareup.okio:okio-jvm 3.4.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.9 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2023-3635: 1.25% estimated exploitation activity in the next 30 days; percentile 69.52 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

GzipSource does not handle an exception that might be raised when parsing a malformed gzip buffer. This may lead to denial of service of the Okio client when handling a crafted GZIP archive, by using the GzipSource class.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-w33c-445m-f8w7

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2023-3635

Advisory: Okio Signed to Unsigned Conversion Error vulnerability
IDs: CVE-2023-3635, GHSA-w33c-445m-f8w7
Record: https://patchnext.com/advisories/cve-2023-3635 (revision 1, source checked 26 Oct 2026, 16:20 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: com.squareup.okio:okio 3.4.0, 1.17.6; com.squareup.okio:okio-jvm 3.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.squareup.okio:okio: affected >= 2.0.0-RC1, < 3.4.0; < 1.17.6; fixed in 1.17.6, 3.4.0
- Maven com.squareup.okio:okio-jvm: affected >= 2.0.0-RC1, < 3.4.0; fixed in 3.4.0

## Suggested inspection (read-only)
- Maven com.squareup.okio:okio: check the installed version with your package manager.
- Maven com.squareup.okio:okio-jvm: 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 com.squareup.okio:okio, com.squareup.okio:okio-jvm.
- 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-w33c-445m-f8w7 (GitHub-reviewed advisory GHSA-w33c-445m-f8w7 lists affected ranges: Maven com.squareup.okio:okio >=2.0.0-RC1 =0 =2.0.0-RC1 <3.4.0)

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