CVE-2023-3635

MEDIUMNVD 5.95.9—

5.9

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.

CVSS v3: 5.9
EG Score: 5.9(medium)
EPSS: 68.8%
KEV: Not listed

Published

July 12, 2023

Last Modified

November 21, 2024

References (4)

reefs@jfroghttps://github.com/square/okio/commit/81bce1a30af244550b0324597720e4799281da7b
reefs@jfroghttps://research.jfrog.com/vulnerabilities/okio-gzip-source-unhandled-exception-dos-xray-523195/
af854a3a-2127-422b-91ae-364da2661108https://github.com/square/okio/commit/81bce1a30af244550b0324597720e4799281da7b
af854a3a-2127-422b-91ae-364da2661108https://research.jfrog.com/vulnerabilities/okio-gzip-source-unhandled-exception-dos-xray-523195/

Patch Availability(3)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	devspaces/udi-rhel8:3.16-6	2024-09-12	redhat
redhat	okio	2024-05-28	redhat
redhat	patch	2023-09-14	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 1 ecosystem)

Maven(2)

Package	Vulnerable range	Fixed in	Dependents
com.squareup.okio:okio	0.5.0 ... 1.9.0 (31 versions)	1.17.6	—
com.squareup.okio:okio-jvm	3.0.0 ... 3.3.0 (6 versions)	3.4.0	—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 21:19 UTCEG score recompute

Frequently asked(5)

What is CVE-2023-3635?

CVE-2023-3635 is a medium vulnerability published on July 12, 2023. 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.

When was CVE-2023-3635 disclosed?

CVE-2023-3635 was first published in the National Vulnerability Database on July 12, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-3635 actively exploited?

CVE-2023-3635 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 68.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-3635?

CVE-2023-3635 has a CVSS v3 base score of 5.9 (NVD).

How do I remediate CVE-2023-3635?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-3635, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-3635

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