EUVD-2026-65519
GHSA-xj79-6hh5-9w6q
Severity by source
CVSS: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
Network-delivered archive requires victim to open it (UI:R); impact is limited to partial memory exhaustion with no confidentiality or integrity exposure.
Primary rating from Vendor (PSF).
CVSS VectorVendor: PSF
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Unbounded memory allocation in CPython's zipfile module allows a crafted archive to exhaust process memory during decompression of bzip2, LZMA, or Zstandard members. The ZipExtFile._read1() method lacked the max_length output bound that the DEFLATE code path already enforced, permitting a small compressed member with an attacker-controlled declared size to expand into unlimited memory per read call. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target opens a crafted zip archive using Python's zipfile module, and that the archive contains at least one member compressed with bzip2 (ZIP_BZIP2), LZMA (ZIP_LZMA), or Zstandard (ZIP_ZSTANDARD) - the DEFLATE (ZIP_DEFLATED) and stored (ZIP_STORED) formats are NOT vulnerable, as they already enforced output bounds. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 2.1 accurately reflects the constrained real-world impact: VA:L indicates only low availability loss, UI:A requires that someone or something opens the crafted archive, and AT:P signals a specific attack requirement is present. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The upstream fix is available as merged GitHub pull request https://github.com/python/cpython/pull/156003, which adds bounded decompress() calls for bzip2, LZMA, and Zstandard paths in zipfile. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today