Out-of-bounds Read in Python Typed Ast
CVE-2019-19274
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.)
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.033 (88.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000
Affected products
- Python Typed Ast — versions 1.3.0, 1.3.1
Weakness classification (CWE)
References
- github.com/python/typed_ast/commit/156afcb26c198e162504a57caddfe0acd9ed7dce (Patch, Third Party Advisory)
- github.com/python/cpython/commit/dcfcd146f8e6fc5c2fc16a4c192a0c5f5ca8c53c (Patch, Third Party Advisory)
- github.com/python/cpython/commit/a4d78362397fc3bced6ea80fbc7b5f4827aec55e (Patch, Third Party Advisory)
- github.com/python/typed_ast/commit/dc317ac9cff859aa84eeabe03fb5004982545b3b (Patch, Third Party Advisory)
- bugs.python.org/issue36495 (Patch, Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2019-19274?
- CVE-2019-19274 is a high-severity vulnerability in Python Typed Ast, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2019-11-26.
- How severe is CVE-2019-19274?
- High severity. CVSS v3 base score is 7.5 out of 10.