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Vulnerability record · CVE-2022-43552 · published 9 February 2023

CVE-2022-43552: Haxx curl use after free vulnerability

Haxx · Curl

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

5.9 CVSS 3.1 Medium EPSS 2.5% · top 15.8% CWE-416 · Use after free
5.9CVSS 3.1 base score
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

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

Affected products

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

References

LinkTags
http://seclists.org/fulldisclosure/2023/Mar/17 Mailing ListThird Party Advisory
https://hackerone.com/reports/1764858 ExploitIssue TrackingThird Party Advisory
https://security.gentoo.org/glsa/202310-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20230214-0002/ Vendor Advisory
https://support.apple.com/kb/HT213670 Third Party Advisory
http://seclists.org/fulldisclosure/2023/Mar/17 Mailing ListThird Party Advisory
https://hackerone.com/reports/1764858 ExploitIssue TrackingThird Party Advisory
https://security.gentoo.org/glsa/202310-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20230214-0002/ Vendor Advisory
https://support.apple.com/kb/HT213670 Third Party Advisory

Track CVE-2022-43552 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2022-43552), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.