MEDIUM 5.9 Microsoft

CVE-2023-28320

A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for resolving host names selected at build time. If it is built to use the synchronous resolver it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.

Microsoft Security Update 2023-May: A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for resolving host names selected at build time. If it is built to use the synchronous resolver it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.

Affected Products

References

Published: 2023-05-09 · Source: Microsoft · Feed updated: 2026-09-03
This medium severity vulnerability with a CVSS score of 5.9 was published on 2023-05-09 via Microsoft. Affected: cbl2 rust 1.72.0-2 on CBL Mariner 2.0, cbl2 mysql 8.0.34-1 on CBL Mariner 2.0, cbl2 curl 8.2.1-1 on CBL Mariner 2.0 and 5 more.
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