CVE-2026-15310
published 2026-08-25CVE-2026-15310: When decompressing crafted zip files using the bzip/LZMA/Zstandard compressions, Python could use an attacker-controlled size to pre-allocate memory, possibly…
PriorityP416low2.1CVSS 4.0
AVNACLATPPRNUIAVCNVINVALSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.53%
43.7th percentile
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.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | python3.11 | — | — |
| debian | python3.13 | — | — |
| debian | python3.14 | — | — |
| python_software_foundation | cpython | < 3.10.22 | 3.10.22 |
| python_software_foundation | cpython | >= 3.11.0 < 3.11.17 | 3.11.17 |
| python_software_foundation | cpython | >= 3.12.0 < 3.12.15 | 3.12.15 |
| python_software_foundation | cpython | >= 3.13.0 < 3.13.16 | 3.13.16 |
| python_software_foundation | cpython | >= 3.14.0 < 3.14.8 | 3.14.8 |
| python_software_foundation | cpython | >= 3.15.0a1 < 3.15.0rc2 | 3.15.0rc2 |
| ubuntu | python3.10 | — | — |
| ubuntu | python3.12 | — | — |
CVSS provenance
nvdv4.02.1LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat2.1LOW
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VulDB
Python up to 3.15.x Zip File memory allocation (EUVD-2026-65519 / Nessus ID 364204)
vuldb·2026-10-08·CVSS 2.1
CVE-2026-15310 [LOW] Python up to 3.15.x Zip File memory allocation (EUVD-2026-65519 / Nessus ID 364204)
A vulnerability, which was classified as problematic, was found in Python up to 3.15.x. This vulnerability affects unknown code of the component Zip File Handler. Executing a manipulation can lead to uncontrolled memory allocation.
This vulnerability appears as CVE-2026-15310. The attack may be performed from remote. There is no available exploit.
You should upgrade the affected component.
GHSA
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.
ghsa_unreviewed·2026-08-25
CVE-2026-15310 [LOW] CWE-400 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.
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.
Red Hat
python: Python: Denial of Service via crafted zip file memory pre-allocation
vendor_redhat·2026-08-25·CVSS 2.1
CVE-2026-15310 [LOW] CWE-770 python: Python: Denial of Service via crafted zip file memory pre-allocation
python: Python: Denial of Service via crafted zip file memory pre-allocation
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.
A flaw was found in Python. When decompressing specially crafted zip files that use bzip, LZMA, or Zstandard compression methods, Python may pre-allocate memory based on an attacker-controlled size. This could lead to excessive memory consumption, potentially causing a Denial of Service (DoS) for the system.
Package: hi/python (Red Hat Hardened Images) - Not affected
Package: python3.10 (Red Hat Hardened Images) - Affected
Package: python3.11 (Red Hat Hardened Images) - Affected
Package: python3.12 (Red Hat Hardened Imag
No detection rules found.
No public exploits indexed.
https://github.com/python/cpython/commit/09a2e7e6678b4f65449e7ad8f112c48f944591e2https://github.com/python/cpython/commit/1b424c0178a01e155fd0267dc28a8fc1159b33a8https://github.com/python/cpython/commit/31980e84b9a708424a0a1dfecde3fc991e313f89https://github.com/python/cpython/commit/6257029de42ef89b67f3d20137de87d43e197530https://github.com/python/cpython/commit/9d167992b59cf5e23c66b9ed742b13f5925f7d70https://github.com/python/cpython/commit/c2bfbcdd1a11690507a10bc0998f95b8dc6b6fachttps://github.com/python/cpython/commit/dcdd406ddbfc4cb29b24c3df17cbabe21d316ce1https://github.com/python/cpython/commit/e2311cfb3dd518f008f312fe0631f4f7490d237ahttps://github.com/python/cpython/commit/f507e6946a3194e83e1d7b8ee6e14567175e46dehttps://github.com/python/cpython/commit/f897dbf2f36a5935700b7c2d94d4681d2136b7d4https://github.com/python/cpython/issues/156002https://github.com/python/cpython/pull/156003https://mail.python.org/archives/list/[email protected]/thread/YUHXURX2WZGKGNA4ANYBQS2VZRYQ5JNK/
2026-08-25
Published