CVE-2024-7592Public exploitNetwork attack vector

Service interruption via quadratic cookie unquoting

Published Aug 19, 2024 · Updated Nov 3, 2025

Algorithmic complexity in CPython's http.cookies module allows remote attackers to consume excessive CPU via crafted quoted cookie values. _unquote() repeatedly searches the remaining string with two regular expressions, causing quadratic work as backslash sequences accumulate. Exposure requires an application to pass attacker-controlled Cookie headers to http.cookies; repeated requests can delay or interrupt service.

CVSS severity7.5
High
EPSS probability2.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Algorithmic complexity in CPython's http.cookies module allows remote attackers to consume excessive CPU via crafted quoted cookie values. _unquote() repeatedly searches the remaining string with two regular expressions, causing quadratic work as backslash sequences accumulate. Exposure requires an application to pass attacker-controlled Cookie headers to http.cookies; repeated requests can delay or interrupt service.

The record

CVE
CVE-2024-7592
Published
Aug 19, 2024
Updated
Nov 3, 2025
Vendor
Python Software Foundation
Product
CPython
Classifications
CWE-1333, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 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 <3.8.20
  2. Affected versionversion=3.10.0 <3.10.15
  3. Affected versionversion=3.11.0 <3.11.10
  4. Affected versionversion=3.12.0 <3.12.6
  5. Affected versionversion=3.13.0a1 <3.13.0rc2
  6. Affected versionversion=3.9.0 <3.9.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Python Software Foundation · CPythonversion=0 <3.8.20; version=3.10.0 <3.10.15; version=3.11.0 <3.11.10; version=3.12.0 <3.12.6; version=3.13.0a1 <3.13.0rc2; version=3.9.0 <3.9.20

Published CVSS scores

7.5National Vulnerability DatabaseCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CWE-400Uncontrolled Resource Consumption
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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