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No exploitation reportedFix available

CVE-2023-23969

No exploitation reported by the sources we read.

  • Published2023-02-01
  • Fixed in4.1.6 · 4.0.9 · 3.2.17
  • WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Django 3.2 before 3.2.17, 4.0 before 4.0.9, and 4.1 before 4.1.6, the parsed values of Accept-Language headers are cached in order to avoid repetitive parsing. This leads to a potential denial-of-service vector via excessive memory usage if the raw value of Accept-Language headers is very large.

Timeline

dates in UTC
  1. 2023-02-0119:15CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-23969?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-23969?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Django
BranchAffectedFixed in
4.1≥ 4.1, < 4.1.64.1.6
4.0≥ 4.0, < 4.0.94.0.9
3.2≥ 3.2, < 3.2.173.2.17
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Django to 4.1.6 · 4.0.9 · 3.2.17

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2025-03-27
  • OpenCVESSVC decisionnone—
  • CISA-ADPCVSS 3.17.52025-03-27
  • NVDCVSS 3.17.5read 2026-10-23
  • CISA-ADPweakness (CWE)CWE-7702025-03-27
  • NVDweakness (CWE)CWE-770read 2026-10-23
  • FIRST EPSSEPSS score47.4 %read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2023-02-01
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-23969?

In Django 3.2 before 3.2.17, 4.0 before 4.0.9, and 4.1 before 4.1.6, the parsed values of Accept-Language headers are cached in order to avoid repetitive parsing. This leads to a potential denial-of-service vector via excessive memory usage if the raw value of Accept-Language headers is very large.

Is CVE-2023-23969 actively exploited?

Active exploitation of CVE-2023-23969 has not been confirmed. Its EPSS score was 47.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-23969?

CVE-2023-23969 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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