What’s Vulnerable › Vulnerabilities

CVE-2022-42916

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-10-29 · updated 2026-10-14
• Weakness: CWE-319

Description

In curl before 7.86.0, the HSTS check could be bypassed to trick it into staying with HTTP. Using its HSTS support, curl can be instructed to use HTTPS directly (instead of using an insecure cleartext HTTP step) even when HTTP is provided in the URL. This mechanism could be bypassed if the host name in the given URL uses IDN characters that get replaced with ASCII counterparts as part of the IDN conversion, e.g., using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop of U+002E (.). The earliest affected version is 7.77.0 2021-05-26.

Affected products

• Apple macOS: before 12.6.3; from 13.0 before 13.2 — fixed in 12.6.3, 13.2
• Fedoraproject Fedora: 35, 36, 37
• curl: from 7.77.0 before 7.86.0 — fixed in 7.86.0
• Splunk Universal Forwarder: from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6; 9.1.0 — fixed in 8.2.12, 9.0.6

How to fix

Upgrade to a fixed version: Apple macOS 12.6.3, 13.2; curl 7.86.0; Splunk Universal Forwarder 8.2.12, 9.0.6. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2023/Jan/19
• http://seclists.org/fulldisclosure/2023/Jan/20
• http://www.openwall.com/lists/oss-security/2022/12/21/1
• https://curl.se/docs/CVE-2022-42916.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5QEVY6LIH2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2ILLC6OV76/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON32XPVWTKDK/
• https://security.gentoo.org/glsa/202212-01
• https://security.netapp.com/advisory/ntap-20221209-0010/
• https://support.apple.com/kb/HT213604
• https://support.apple.com/kb/HT213605
• http://seclists.org/fulldisclosure/2023/Jan/19

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