OkHttp through 5.5.1 contains an improper certificate validation vulnerability in CertificatePinner that skips pin checks because…
CVE-2026-129482
OkHttp through 5.5.1 contains an improper certificate validation vulnerability in CertificatePinner that skips pin checks because Pin.matchesHostname does not normalize trailing-dot hostnames. Network attackers with a CA-trusted certificate not matching configured pins can intercept or modify TLS traffic when applications request the trailing-dot form of pinned hosts.
Assessment
- CVSS
- 6.3 (v4.0)
- Severity
- Medium
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 15 November 2026
- Last updated
- 15 November 2026
- Assigner
- VulnCheck
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
At the source
References
- https://github.com/lysine-dev/okhttp/issues/9724
- https://github.com/lysine-dev/okhttp/pull/9734
- https://github.com/lysine-dev/okhttp/commit/30aa589761a9b4f5fe84c00e21e5ab44b22bd7c1
- https://github.com/lysine-dev/okhttp/blob/parent-5.5.1/okhttp/src/commonJvmAndroid/kotlin/okhttp3/CertificatePinner.kt#L293-L314
- https://www.vulncheck.com/advisories/okhttp-through-5.5.1-certificate-pinning-bypass-via-trailing-dot-hostname
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