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Fencer Vulns
medium 5.9

CVE-2023-3635 json

Okio GzipSource unhandled exception Denial of Service

published 2023-07-12 3 y ago modified 2026-09-10 1 mo ago also GHSA-w33c-445m-f8w7 , EUVD-2023-2158

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven com.squareup.okio:okio 1.17.6, 3.4.0
  • maven com.squareup.okio:okio-jvm 3.4.0
  • squareup okio 1.17.6, 3.4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-3635 updated cvss 7.5

okio: GzipSource class improper exception handling

  • Red Hat build of Apicurio Registry 2 okio
    affected: no fix available
  • Red Hat Data Grid 8 okio
    affected: no fix available “Fix deferred”
  • Red Hat Decision Manager 7 okio Red Hat JBoss Fuse 6 okio
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Application Runtimes okio
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 3.11 openshift3/ose-logging-elasticsearch5, openshift3/ose-metrics-hawkular-metrics
    affected: no fix planned “Out of support scope”
  • Red Hat Single Sign-On 7 okio
    affected: no fix planned “Will not fix”
  • Red Hat support for Spring Boot okio
    affected: no fix available “Fix deferred”
  • Red Hat streams for Apache Kafka okio
    affected: no fix available
show 6 more
  • Red Hat AMQ Streams 2.5.0
    fixed: vendor fix RHSA-2023:5165
  • Red Hat Fuse 7.12.1
    fixed: vendor fix RHSA-2023:7247
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
    fixed: vendor fix RHSA-2024:3385
  • Red Hat OpenShift Dev Spaces 3 devspaces/udi-rhel8 3.16-6, devspaces/idea-rhel8 3.16-3, devspaces/code-rhel8 3.16-20, devspaces/server-rhel8 3.16-14, devspaces/traefik-rhel8 3.16-2, devspaces/configbump-rhel8 3.16-4, +7 more
    fixed: vendor fix RHSA-2024:6667
  • Red Hat RHPAM 7.13.5 async
    fixed: vendor fix RHSA-2024:1353
  • Red Hat Cryostat 2 okio Red Hat JBoss Enterprise Application Platform 7 okio Red Hat OpenShift Container Platform 4 openshift4/ose-metering-hive, openshift4/ose-metering-hadoop, openshift4/ose-metering-presto
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.25% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • research.jfrog.com https://research.jfrog.com/vulnerabilities/okio-gzip-source-unhandled-exception-dos-xray-523195/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven com.squareup.okio:okio
>=2.0.0-RC1, <3.4.0
<1.17.6
3.4.0
1.17.6
maven com.squareup.okio:okio-jvm
>=2.0.0-RC1, <3.4.0
3.4.0

Classification

Weakness
  • CWE-195 Signed to Unsigned Conversion Error
  • CWE-681 Incorrect Conversion between Numeric Types

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.