What is CVE-2023-3635?

CVE-2023-3635 is a medium-severity vulnerability in Squareup Okio, classified under CWE-195. CVSS score: 5.9/10. Published 2023-07-12.

How severe is CVE-2023-3635?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2023-3635 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Squareup Okio

CVE-2023-3635

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.

Published 2023-07-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.3th percentile), scored 2026-10-25.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Squareup Okio

Weakness classification (CWE)

Public proof-of-concept exploits

References

research.jfrog.com/vulnerabilities/okio-gzip-source-unhandled-exception-dos-xra… (Exploit, Patch, Third Party Advisory)
github.com/square/okio/commit/81bce1a30af244550b0324597720e4799281da7b (Patch)

Frequently asked questions

What is CVE-2023-3635?: CVE-2023-3635 is a medium-severity vulnerability in Squareup Okio, classified under CWE-195. CVSS score: 5.9/10. Published 2023-07-12.
How severe is CVE-2023-3635?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2023-3635 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.