CVE-2019-19274

Name: CVE-2019-19274
Creator: NVD / NIST
Published: 2019-11-26T15:15:12.77+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.26%

Last modified Jun 17, 2026

CVE-2019-19274 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. typed_ast 1.3.0 and 1.3.1 has a handle_keywordonly_args out-of-bounds read. An attacker with the ability to cause a Python interpreter to parse Python source (but not necessarily execute it) may be able to crash the interpreter process. EPSS estimates a 3.26% chance of exploitation in the next 30 days.

Description

typed_ast 1.3.0 and 1.3.1 has a handle_keywordonly_args out-of-bounds read. An attacker with the ability to cause a Python interpreter to parse Python source (but not necessarily execute it) may be able to crash the interpreter process. This could be a concern, for example, in a web-based service that parses (but does not execute) Python code. (This issue also affected certain Python 3.8.0-alpha prereleases.)

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.26%

86.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Python	Typed Ast	1.3.0
Python	Typed Ast	1.3.1

References

https://bugs.python.org/issue36495Patch, Vendor Advisory
https://github.com/python/cpython/commit/a4d78362397fc3bced6ea80fbc7b5f4827aec55ePatch, Third Party Advisory
https://github.com/python/cpython/commit/dcfcd146f8e6fc5c2fc16a4c192a0c5f5ca8c53cPatch, Third Party Advisory
https://github.com/python/typed_ast/commit/156afcb26c198e162504a57caddfe0acd9ed7dcePatch, Third Party Advisory
https://github.com/python/typed_ast/commit/dc317ac9cff859aa84eeabe03fb5004982545b3bPatch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LG5H4Q6LFVRX7SFXLBEJMNQFI4T5SCEA/
https://bugs.python.org/issue36495Patch, Vendor Advisory
https://github.com/python/cpython/commit/a4d78362397fc3bced6ea80fbc7b5f4827aec55ePatch, Third Party Advisory
https://github.com/python/cpython/commit/dcfcd146f8e6fc5c2fc16a4c192a0c5f5ca8c53cPatch, Third Party Advisory
https://github.com/python/typed_ast/commit/156afcb26c198e162504a57caddfe0acd9ed7dcePatch, Third Party Advisory
https://github.com/python/typed_ast/commit/dc317ac9cff859aa84eeabe03fb5004982545b3bPatch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LG5H4Q6LFVRX7SFXLBEJMNQFI4T5SCEA/

Timeline

Published: Nov 26, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-19274?

How severe is CVE-2019-19274?

CVE-2019-19274 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.26% probability of exploitation in the next 30 days.

How do I fix CVE-2019-19274?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-19274?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST