CVE-2016-2402 Improper Certificate Validation in OkHttp
Man-in-the-middle attackers can bypass certificate pinning in OkHttp by presenting a valid chain from a non-pinned trusted CA.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-2402?
CVE-2016-2402 is a medium-severity vulnerability in n/a, published on 30 Jan 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OkHttp before 2.7.4 and 3.x before 3.1.2 allows man-in-the-middle attackers to bypass certificate pinning by sending a certificate chain with a certificate from a non-pinned trusted CA and the pinned certificate.
Weakness: CWE-295
Which versions are affected by CVE-2016-2402?
4 open source packages ship an affected version, including com.squareup.okhttp3:okhttp. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
com.squareup.okhttp3:okhttp Maven | All versions | 2.7.4 |
com.squareup.okhttp3:okhttp Maven | All versions | 2.7.4 |
com.squareup.okhttp3:okhttp Maven | From 3.0.0 | 3.1.2 |
com.squareup.okhttp3:okhttp Maven | From 3.0.0 | 3.1.2 |
Products include Squareup Okhttp, Squareup Okhttp3.
How do I fix CVE-2016-2402?
Upgrade com.squareup.okhttp3:okhttp to a fixed version for your release line: 2.7.4 or 3.1.2.
Is CVE-2016-2402 being exploited?
There is no known exploitation of CVE-2016-2402 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in n/a
Sources
Also known as CLEANSTART-2026-HM98634, GHSA-4hc2-jh7r-wrc3.