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Vulnerability record · CVE-2022-42916 · published 29 October 2022

CVE-2022-42916: Haxx curl cleartext transmission vulnerability

Haxx · Curl

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.

7.5 CVSS 3.1 High EPSS 2.5% · top 15.0% CWE-319 · Cleartext transmission
7.5CVSS 3.1 base score
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
24References
14 Oct 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://seclists.org/fulldisclosure/2023/Jan/19 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2023/Jan/20 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/12/21/1 Mailing ListThird Party Advisory
https://curl.se/docs/CVE-2022-42916.html Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON3 Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202212-01 Third Party Advisory
https://security.netapp.com/advisory/ntap-20221209-0010/ Broken Link
https://support.apple.com/kb/HT213604 Third Party Advisory
https://support.apple.com/kb/HT213605 Third Party Advisory
http://seclists.org/fulldisclosure/2023/Jan/19 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2023/Jan/20 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/12/21/1 Mailing ListThird Party Advisory
https://curl.se/docs/CVE-2022-42916.html Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON3 Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202212-01 Third Party Advisory
https://security.netapp.com/advisory/ntap-20221209-0010/ Broken Link
https://support.apple.com/kb/HT213604 Third Party Advisory
https://support.apple.com/kb/HT213605 Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://cert-portal.siemens.com/productcert/html/ssa-892048.html

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Source: NIST National Vulnerability Database (record CVE-2022-42916), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.