CVE-2023-28320

2023-05-2600:00:00

CWE-400

hackerone

www.cve.org

denial of service

curl

vulnerability

libcurl

synchronous resolver

name resolves

timeout

alarm

siglongjmp

multithreaded application

crash

AI Score

6.8

Confidence

High

EPSS

0.002

Percentile

55.5%

JSON

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.

CNA Affected

[
  {
    "vendor": "n/a",
    "product": "https://github.com/curl/curl",
    "versions": [
      {
        "version": "Fixed in 8.1.0",
        "status": "affected"
      }
    ]
  }
]