Use After Free Affecting glibc package, versions <2.32-1


Severity

Recommended
0.0
critical
0
10

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Threat Intelligence

EPSS
2.87% (86th percentile)

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  • Snyk IDSNYK-ECHOLATEST-GLIBC-18610916
  • published11 Aug 2026
  • disclosed25 May 2021

Introduced: 25 May 2021

CVE-2021-33574  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Echo:latest glibc to version 2.32-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream glibc package and not the glibc package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes object (passed through its struct sigevent parameter) after it has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified other impact.

CVSS Base Scores

version 3.1