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Advisory record · GHSA-w33c-445m-f8w7

Okio Signed to Unsigned Conversion Error vulnerability

CVSS 5.9 MediumEPSS 0.013 · 69th percentile

Published by the GitHub Advisory Database at 12 Jul 2023, 21:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.squareup.okio:okioMaven>=2.0.0-RC1, <3.4.0 || <1.17.63.4.0, 1.17.6
com.squareup.okio:okio-jvmMaven>=2.0.0-RC1, <3.4.03.4.0
Identifiers
GHSA-w33c-445m-f8w7 · CVE-2023-3635
Weakness (CWE)
CWE-195 · CWE-681
Tags
Published
12 Jul 2023
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Okio (com.squareup.okio:okio) versions from 2.0.0-RC1 before 3.4.0, and versions before 1.17.6, are affected, as are okio-jvm versions from 2.0.0-RC1 before 3.4.0. An attacker who can supply a crafted GZIP archive that the application reads through GzipSource can cause a denial of service in the Okio client. Upgrade okio to 3.4.0 or 1.17.6, and okio-jvm to 3.4.0.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.9 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (JFROG)
  • CISA KEV Not listed.
  • EPSS 0.013, the 69th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:18 UTC First seen by agentprime
  2. 31 Oct 2026, 14:18 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.