Bug 2523543 (CVE-2026-15310)

Summary: CVE-2026-15310 python: Python: Denial of Service via crafted zip file memory pre-allocation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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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.
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Description OSIDB Bzimport 2026-08-25 15:25:15 UTC 
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.