An improper certificate validation vulnerability exists in curl x*, which would match even though the IDN name most likely contained nothing even resembling an x.
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Score 5.9 from GitHub Security Advisory published 2023-05-26. NVD baseline CVSS 5.9; sources differ by 0.0.
An improper certificate validation vulnerability exists in curl x*, which would match even though the IDN name most likely contained nothing even resembling an x.
May 26, 2023
January 15, 2025
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | libcurl4-openssl-dev (7.47.0-1ubuntu2.19+esm9) @ xenial | 2026-05-25 | ubuntu |
| ubuntu | curl (7.68.0-1ubuntu2.19) @ focal | 2026-05-25 | ubuntu |
| redhat | curl-0:7.61.1-22.el8_6.9 | 2023-11-02 | redhat |
| redhat | curl-0:7.76.1-14.el9_0.7 | 2023-10-10 | redhat |
| redhat | jbcs-httpd24-curl-0:8.2.1-1.el7jbcs | 2023-08-15 | redhat |
| redhat | jbcs-httpd24-curl | 2023-08-15 | redhat |
| redhat | curl-0:7.61.1-30.el8_8.3 | 2023-08-08 | redhat |
| redhat | curl-0:7.76.1-23.el9_2.2 | 2023-08-01 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as "Subject Alternative Name" in TLS server certificates. curl can be built to use its own name matching function for TLS rather than one provided by a TLS library. This private wildcard matching function would match IDN (International Domain Name) hosts incorrectly and could as a result accept patterns that otherwise should mismatch. IDN hostnames are converted to puny code before used for certificate checks. Puny coded names always start with `xn--` and should not be allowed to pattern match but the wildcard check in curl could still check for `x*` which would match even though the IDN name most likely contained nothing even resembling an `x`.
RHSA-2023:4354 — Moderate
RHSA-2023:4523 — Moderate
RHSA-2023:4628 — Moderate
RHSA-2023:4629 — Moderate
RHSA-2023:5598 — Moderate
RHSA-2023:6292 — Moderate
curl vulnerabilities
curl vulnerabilities
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
Explore the affected products and dependency analysis for CVE-2023-28321
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