CVE-2023-28322: An information disclosure vulnerability exists in curl <v8.1.0 when doing HTTP(S) transfers libcurl might erroneously use the read callback (`CURLOPT_READFUNCTION`) to ask for data to send even when the `CURLOPT_POSTFIELDS` option has been set if the same handle previously wasused to issue a `PUT` request which used that callback. This flaw may surprise the application and cause it to misbehave and either send off the wrong data or use memory after free or similar in the second transfer. The problem exists in the logic for a reused handle when it is (expected to be) changed from a PUT to a POST.
Overview
- Severity
- Low (CVSS 3.7)
- CVSS Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2023-May
- Released
- 2023-05-27
- Last Updated
- 2026-02-18
- EPSS Score
- 2.21% (percentile: 81.1%)
FAQ
Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Affected Products (9)
Other
- 19668-17086
- 18295-17084
- 19671-17084
- 17875-16820
- 17876-16823
- 17877-16823
- 17878-17084
- 17879-17084
- 19686-17084
Revision History
- 2023-05-27: Information published.
- 2023-05-28: Added curl to CBL-Mariner 1.0
- 2024-06-30: Information published.
- 2026-02-18: Information published.