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  4. CVE 2026 15310 zipfile bzip2lzmazstandard members decompress
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Back to active CVEs
Low ยท CVSS 2.1CVE-2026-15310

zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limitsCVE-2026-15310

Answer in brief

CVE-2026-15310 records a Low severity (CVSS 2.1) vulnerability in zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits. The current sources do not mark it as known exploited. The current feed maps Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Oct 2, 2026Source checked Oct 10, 2026First seen by HOL Aug 25, 2026Material review Oct 2, 2026
Upstream Advisory

Key facts

Risk
Low ยท CVSS 2.1
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 2.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic), Python Software Foundation/CPython (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Python Software Foundation/CPythongeneric>=0 <3.10.22 || >=3.11.0 <3.11.17 || >=3.12.0 <3.12.15 || >=3.13.0 <3.13.16 || >=3.14.0 <3.14.8 || >=3.15.0a1 <3.15.0rc23.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2
Python Software Foundation/CPythongeneric>=0 <3.16.03.16.0
Python Software Foundation/CPythongeneric>=0 <3.15.03.15.0
Python Software Foundation/CPythongeneric>=0 <3.15.0rc23.15.0rc2
Python Software Foundation/CPythongeneric>=0 <3.12.15 || >=3.13.0 <3.13.16 || >=3.14.0 <3.14.8 || >=3.15.0a1 <3.15.0rc23.12.15, 3.13.16, 3.14.8, 3.15.0rc2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Python Software Foundation/CPython, Python Software Foundation/CPython, Python Software Foundation/CPython.
  2. 2Review the reported fix. Update Python Software Foundation/CPython to 3.10.22; Python Software Foundation/CPython to 3.16.0; Python Software Foundation/CPython to 3.15.0; Python Software Foundation/CPython to 3.15.0rc2; Python Software Foundation/CPython to 3.12.15 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 25, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencemail.python.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart body processorAlso CWE-400
  • ageLANServer: Unbounded JSON Array Allocation in AoE3 Cloud `getFileURL` Endpoint Leads to Remote Denial of ServiceAlso CWE-400
  • yopass Prometheus metrics middleware allows remote memory exhaustion through unbounded method labelsAlso CWE-400
  • MariaDB: `qc_info` plugin can do OOB reads if query contains \0Same generic ecosystem
  • MariaDB: mysql_json plugin OOB readsSame generic ecosystem
  • MariaDB: environment injection via wsrep bootstrap in the mariadb.service fileSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-400
Source
CVE List V5
Source checked
Oct 10, 2026
References
13 linked sources
Open source record