CVE-2024-0450Public exploit

Denial of service via overlapping ZIP entries

Published Mar 19, 2024 · Updated Nov 3, 2025

Denial of service in CPython allows local users to exhaust storage by extracting a crafted quoted-overlap ZIP archive with zipfile. ZipFile.open trusted each entry's compressed size without checking whether its data crossed the next local header or central directory, allowing overlapping streams to expand repeatedly. Exploitation requires code to process the crafted archive; the demonstrated 116 KB input expands to 17 GB and can interrupt the application or host.

CVSS severity6.2
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in CPython allows local users to exhaust storage by extracting a crafted quoted-overlap ZIP archive with zipfile. ZipFile.open trusted each entry's compressed size without checking whether its data crossed the next local header or central directory, allowing overlapping streams to expand repeatedly. Exploitation requires code to process the crafted archive; the demonstrated 116 KB input expands to 17 GB and can interrupt the application or host.

The record

CVE
CVE-2024-0450
Published
Mar 19, 2024
Updated
Nov 3, 2025
Vendor
Python Software Foundation
Product
CPython
Classifications
CWE-405, CAPEC-130
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.8.18
  2. Affected versionversion=0 <3.8.19
  3. Affected versionversion=3.10.0 <3.10.14
  4. Affected versionversion=3.10.13
  5. Affected versionversion=3.11.0 <3.11.8
  6. Affected versionversion=3.11.7
  7. Affected versionversion=3.12.0 <3.12.2
  8. Affected versionversion=3.12.1
  9. Affected versionversion=3.13.0a1 <3.13.0a3
  10. Affected versionversion=3.9.0 <3.9.19
  11. Affected versionversion=3.9.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Python Software Foundation · CPythonversion=0 <3.8.18; version=0 <3.8.19; version=3.10.0 <3.10.14; version=3.10.13; version=3.11.0 <3.11.8; version=3.11.7; version=3.12.0 <3.12.2; version=3.12.1; version=3.13.0a1 <3.13.0a3; version=3.9.0 <3.9.19; version=3.9.18

Published CVSS scores

6.2Python Software FoundationCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-405Asymmetric Resource Consumption (Amplification)
CAPEC-130Excessive Allocation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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