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CVE-2019-19275

typed-ast Out-of-bounds Read

7.5 HighFix available

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

3.28%Up 1.7 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
CVE-2019-19275
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-125
Updated
2026-11-02
CVE List No score

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
CVE-2019-19275
Updated
2026-11-02
EUVDEUVD-2019-0150 No score

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
EUVD-2019-0150
Updated
2026-11-03
GitHub AdvisoriesGHSA-7xxv-wpxj-mx5v 8.7

typed-ast Out-of-bounds Read

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
GHSA-7xxv-wpxj-mx5v
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSVBELL-CVE-2019-19275 7.5

CVE-2019-19275 does not affect BellSoft software

Record
BELL-CVE-2019-19275
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 7.5

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
CVE-2019-19275
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 7 moreShow less
OSVDEBIAN-CVE-2019-19275 7.5

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
DEBIAN-CVE-2019-19275
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVGHSA-7xxv-wpxj-mx5v 8.7

typed-ast Out-of-bounds Read

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
GHSA-7xxv-wpxj-mx5v
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSVUBUNTU-CVE-2019-19275 7.5

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
UBUNTU-CVE-2019-19275
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2020-0249 No score

Updated python-typed-ast packages fix security vulnerability

Updated python-typed-ast package fixes security vulnerabilities:

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 (CVE-2019-19274).

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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 (CVE-2019-19275).

Record
MGASA-2020-0249
Updated
2026-11-02
OSVopenSUSE-SU-2020:0567-1 No score

Security update for python-typed-ast

This update for python-typed-ast fixes the following issues:

python-typed-ast was reverted to version 1.3.1 because it broke another package (bsc#1163532).

Security issues fixed:

  • CVE-2019-19274: Fixed an out-of-bounds read (bsc#1161562).
  • CVE-2019-19275: Fixed an out-of-bounds read (bsc#1161563).
Record
openSUSE-SU-2020:0567-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:0609-1 No score

Security update for python-typed-ast

This update for python-typed-ast fixes the following issues:

python-typed-ast was reverted to version 1.3.1 because it broke another package (bsc#1163532).

Security issues fixed:

  • CVE-2019-19274: Fixed an out-of-bounds read (bsc#1161562).
  • CVE-2019-19275: Fixed an out-of-bounds read (bsc#1161563).

This update was imported from the openSUSE:Leap:15.1:Update update project.

Record
openSUSE-SU-2020:0609-1
Updated
2026-11-02
OSVPYSEC-2019-131 No score

typed_ast 1.3.0 and 1.3.1 has an ast_for_arguments 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.)

Record
PYSEC-2019-131
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
typed-ast
PyPI
1.3.0 to 1.3.1
1.3.2
python3-typed-ast
Debian:12
before 1.4.0-1
1.4.0-1
typed-ast
PyPI
1.3.0 up to 1.3.2, plus listed versions
1.3.1
1.3.2
python-typed-ast
Mageia:7
before 1.3.1-1.1.mga7
1.3.1-1.1.mga7
typed-ast
PyPI
before 1.3.2, plus listed versions
0.50.5.10.5.20.5.30.5.4
Show 17 moreShow less
0.5.50.5.60.6.00.6.10.6.20.6.31.0.01.0.11.0.21.0.31.0.41.1.01.1.11.1.21.2.01.3.01.3.1
1.3.2
python3-typed-ast
Ubuntu:18.04:LTS
All versions, plus listed versions
1.0.4-1build11.1.0-1
None known
python-typed-ast
openSUSE:Leap 15.1
before 1.3.1-lp151.2.6.1
1.3.1-lp151.2.6.1
python-typed-ast
SUSE:Package Hub 15 SP1
before 1.3.1-bp151.2.6.1
1.3.1-bp151.2.6.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-19275 is a high vulnerability (CVSS 7.5) in Python Typed Ast, published November 26, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.28%, the 88th percentile. Fixed in typed-ast 1.3.2.

References

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