CVE-2026-15310
Low
Description
When decompressing crafted zip files using the bzip/LZMA/Zstandard compressions, Python could use an attacker-controlled size to pre-allocate memory, possibly resulting in memory exhaustion.
SeverityLow
CVSS2.1
Exploit probability—
ProductCPython
PublishedAug 25, 2026
First seenAug 25, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- Python Software Foundation CPython3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2 or later
Patches
- github.com/python/cpython/pull/156003
- github.com/python/cpython/commit/f897dbf2f36a5935700b7c2d94d4681d2136b7d4
- github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8
- github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89
- github.com/python/cpython/commit/e2311cfb3dd518f008f312fe0631f4f7490d237a
- github.com/python/cpython/commit/f507e6946a3194e83e1d7b8ee6e14567175e46de
- github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70
- github.com/python/cpython/commit/dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1
- github.com/python/cpython/commit/09a2e7e6678b4f65449e7ad8f112c48f944591e2
- github.com/python/cpython/commit/6257029de42ef89b67f3d20137de87d43e197530
- github.com/python/cpython/commit/c2bfbcdd1a11690507a10bc0998f95b8dc6b6fac
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Python Software Foundation CPython | v < 3.10.22, 3.11.0 ≤ v < 3.11.17, 3.12.0 ≤ v < 3.12.15, 3.13.0 ≤ v < 3.13.16, 3.14.0 ≤ v < 3.14.8, 3.15.0a1 ≤ v < 3.15.0rc2 | 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.