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Medium 2 vendors · 2 advisories

CVE-2026-3644: Incomplete control character validation in http.cookies

CVE-2026-3644 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
Medium
CVSS base score
6 (NetApp), 5.4 (Red Hat)
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 · base score 6, scored by PSFAttack vector: network. Attack complexity: low. Attack requirements: present. Privileges required: low. User interaction: none. Confidentiality impact on the vulnerable system: low. Integrity impact on the vulnerable system: high. Availability impact on the vulnerable system: none. Confidentiality impact on subsequent systems: none. Integrity impact on subsequent systems: none. Availability impact on subsequent systems: none.
Weakness
  • CWE-20 Improper Input Validation
  • CWE-116 Improper Encoding or Escaping of Output
EPSS
0.51% chance of exploitation in the next 30 days (43rd percentile). FIRST EPSS, .
CISA SSVC
Exploitation: none observed. Automatable: no. Technical impact: partial. CISA, .
Fixed releases
  • Red Hat: RHSA-2026:19019
Vendor advisories
2 from NetApp, Red Hat
Assigned by
PSF (CNA)
CVE record published
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-3644; each belongs to its advisory, not to every product listed. How records are collected and checked.

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().

Text from the CVE.org record (PSF).

How do I fix CVE-2026-3644?

Upgrade to a fixed release named by the vendor:

  • Red Hat: RHSA-2026:19019
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:19019 (`sudo dnf update` / `yum update`). (Red Hat)

Vendor advisories for CVE-2026-3644

NetApp

1 advisory
  • Advisory severityMedium6.0

    Medium [CVE-2026-3644] Python Vulnerability in NetApp Products

    NTAP-20260410-0020Source published Source updated

    Multiple NetApp products incorporate Python. Certain versions of Python are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information or addition or modification of data. Affected products: Active IQ Unified Manager for Microsoft Windows, Active IQ Unified Manager for VMware vSphere, Management Services for Element Software and NetApp HCI. NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.

    Affected products in this advisory
    • Active IQ Unified Manager for Microsoft Windows
    • Active IQ Unified Manager for VMware vSphere
    • Management Services for Element Software and NetApp HCI
    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityMedium5.4

    Medium [CVE-2026-3644] Incomplete control character validation in http.cookies

    CVE-2026-3644Source published

    Incomplete control character validation in http.cookies. Red Hat rates this moderate (CVSS 5.4). Weakness: CWE-791. Affected package(s): python3.12, python3, python3.14, rhui5/rhua-rhel9:1779798222, rhui5/installer-rhel9:1779798165. Resolved in Red Hat advisory RHSA-2026:19019 — update the affected packages (`sudo dnf update`).

    Related products — impact not confirmed
    • Red Hat Enterprise Linux 9
    • Red Hat Enterprise Linux 1
    • Red Hat Enterprise Linux 8
    • python3.12

    3 more entries in the full advisory.

    Source-reported affected versions
    • python3.12-0:3.12.13-2.el9_8
    • python3-12-main-3.12.13-3.hum1
    • python3-14-main-3.14.4-1.hum1
    • python3.12-0:3.12.13-2.el10_2

    7 more entries in the full advisory.

    Source-reported fixed versions
    • RHSA-2026:19019
    Mitigation guidance
    • Update the affected package(s) to the fixed version shipped in RHSA-2026:19019 (`sudo dnf update` / `yum update`).
    Full advisory and evidenceOpen source bulletin

References

Timeline

  1. First vendor advisory listed by VulniPulse
  2. CVE record published
  3. CVE record last updated

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