What’s Vulnerable › Vulnerabilities

CVE-2016-1133

• Severity: low (CVSS 3.7 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-01-16 · updated 2026-06-17

Description

CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.

Affected products

• h2o: through 1.6.1; 1.7.0-beta2

References

• http://jvn.jp/en/jp/JVN45928828/index.html
• http://jvndb.jvn.jp/jvndb/JVNDB-2016-000003
• https://github.com/h2o/h2o/issues/682
• https://github.com/h2o/h2o/issues/684
• https://h2o.examp1e.net/vulnerabilities.html#CVE-2016-1133
• http://jvn.jp/en/jp/JVN45928828/index.html
• http://jvndb.jvn.jp/jvndb/JVNDB-2016-000003
• https://github.com/h2o/h2o/issues/682
• https://github.com/h2o/h2o/issues/684
• https://h2o.examp1e.net/vulnerabilities.html#CVE-2016-1133

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