Trending
CVE-2026-3644

CVE detail

CVE-2026-3644

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().

CVSS 6.0 · MediumBuzz score 38.0

Buzz score

Why this CVE is surfacing

Buzz score total 38.0

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 23.0 · diversity 15.0 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

23.0

9 evidence mentions in the snapshot

Diversity score

15.0

3 sources across 3 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 0; within the 30d window
Peak daily: 0; highest bucket

Evidence

Source links by recency

Newest mentions first

9 source links · newest first

CVE-2026-3644 Incomplete control character validation in http.cookiesMicrosoft MSRC
Information published.
vendormsrc.microsoft.comJun 3, 2026, 8:46 AM
https://mail.python.org/archives/list/[email protected]/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/mail.python.org
No excerpt available.
Vendor Advisorymail.python.orgMar 16, 2026, 6:16 PM
https://github.com/python/cpython/pull/145600github.com
No excerpt available.
Exploitgithub.comMar 16, 2026, 6:16 PM
https://github.com/python/cpython/issues/145599github.com
No excerpt available.
Exploitgithub.comMar 16, 2026, 6:16 PM
https://github.com/python/cpython/commit/dae4b1a21f8df4570e30986affd61bbe4ade4cefgithub.com
No excerpt available.
Exploitgithub.comMar 16, 2026, 6:16 PM
https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979ddgithub.com
No excerpt available.
Exploitgithub.comMar 16, 2026, 6:16 PM
https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590ddgithub.com
No excerpt available.
Exploitgithub.comMar 16, 2026, 6:16 PM
https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4github.com
No excerpt available.
Exploitgithub.comMar 16, 2026, 6:16 PM
https://github.com/python/cpython/commit/556aa098e738b127c714866f819b4abe2f7593d8github.com
No excerpt available.
Exploitgithub.comMar 16, 2026, 6:16 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

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External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2026-3644.

Product-level CPE searches intentionally omit version fields and NVD version-range or configuration certainty. Verify the exact product version and configuration independently.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

cpe:2.3:a:python:pythonSearch this product on Shodan

Exact CVE query

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vuln:CVE-2026-3644Search this CVE on Shodan

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Metadata

Canonical fields

NVD status

Modified

Published

Mar 16, 2026

Modified

Jun 30, 2026

Official record

Authoritative NVD record

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE IDs

Vendor classifications

How this vector reads

CVSS 4.0 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Network. The vulnerable system can be reached across network boundaries.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Attack Requirements (AT): Present. A prerequisite deployment or execution condition must be present.
Privileges Required (PR): Low. The attacker needs basic user-level privileges.
User Interaction (UI): None. Exploitation does not require a targeted user to act.
Vulnerable System Confidentiality (VC): Low. There is a limited impact to this security property.
Vulnerable System Integrity (VI): High. There is a total or serious impact to this security property.
Vulnerable System Availability (VA): None. There is no direct impact to this security property.
Subsequent System Confidentiality (SC): None. There is no direct impact to this security property.
Subsequent System Integrity (SI): None. There is no direct impact to this security property.
Subsequent System Availability (SA): None. There is no direct impact to this security property.

Optional CVSS v4 metrics remain in the raw vector; only base metrics are expanded here.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses