CVE-2023-3782 — DoS of the OkHttp client when using a BrotliInterceptor and surfing to a malicio

DoS of the OkHttp client when using a BrotliInterceptor and surfing to a malicious web server, or when an attacker can perform MitM to inject a Brotli zip-bomb into an HTTP response

01What is this vulnerability?

DoS of the OkHttp client when using a BrotliInterceptor and surfing to a malicious web server, or when an attacker can perform MitM to inject a Brotli zip-bomb into an HTTP response

02Affected products

Vendor	Product	Versions
?	?	0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-07-19T20:57:16.170Z
• Last modified: 2024-10-28T15:09:37.728Z

09References

• github.com — https://github.com/square/okhttp/issues/7738
• research.jfrog.com — https://research.jfrog.com/vulnerabilities/okhttp-client-brotli-dos/