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MEDIUM

CVE-2022-31015

CVSS v3

5.9

MEDIUM

EPSS Score

1.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • waitressPyPIfrom 2.1.0 · fixed in 2.1.2

Vendor advisories

  • CVE-2022-31015 Red Hat Product Security

    waitress: uncaught Exception (due to a data race) leads to process termination

Full record on NVD

Description

Waitress is a Web Server Gateway Interface server for Python 2 and 3. Waitress versions 2.1.0 and 2.1.1 may terminate early due to a thread closing a socket while the main thread is about to call select(). This will lead to the main thread raising an exception that is not handled and then causing the entire application to be killed. This issue has been fixed in Waitress 2.1.2 by no longer allowing the WSGI thread to close the socket. Instead, that is always delegated to the main thread. There is no work-around for this issue. However, users using waitress behind a reverse proxy server are less likely to have issues if the reverse proxy always reads the full response.

Technical details

Published
2022-05-31

Frequently asked questions

What is CVE-2022-31015?

Waitress is a Web Server Gateway Interface server for Python 2 and 3. Waitress versions 2.1.0 and 2.1.1 may terminate early due to a thread closing a socket while the main thread is about to call select(). This will lead to the main thread raising an exception that is not handled and then causing the entire application to be killed. This issue has been fixed in Waitress 2.1.2 by no longer allowing the WSGI thread to close the socket. Instead, that is always delegated to the main thread. There is no work-around for this issue. However, users using waitress behind a reverse proxy server are less likely to have issues if the reverse proxy always reads the full response.

Is CVE-2022-31015 actively exploited?

Active exploitation of CVE-2022-31015 has not been confirmed. Its EPSS score was 1.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-31015?

CVE-2022-31015 has a CVSS v3 base score of 5.9 (MEDIUM severity).

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