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VULNERABILITIES

CVE-2026-3644 Details

Description

The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/python/cpython/commit/3974092b037f9a3b000fb15b48ea61ce3b25d330 [email protected]
https://github.com/python/cpython/commit/556aa098e738b127c714866f819b4abe2f7593d8 [email protected]
https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4 [email protected]Patch
https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd [email protected]Patch
https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd [email protected]Patch

see all 9 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-116Improper Encoding or Escaping of OutputCISA-ADP
CWE-20Improper Input ValidationCISA-ADP

Affected Products

ProductVersions
python python
< 3.13.13
>= 3.14.0, < 3.14.4
3.15.0 alpha1
3.15.0 alpha2
3.15.0 alpha3

CPE

  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*
  • cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

8 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-3644
NVD Published Date:
Mar 16, 2026
NVD Last Modified:
Aug 13, 2026
Source:
[email protected]