Security readout for executives and security teams
Plain-English summary
CVE-2026-0672 affects CPython’s http.cookies.Morsel handling. If an application places user-controlled data into cookie names, values, or parameters, an attacker may inject extra HTTP headers. The business concern is response manipulation, not system takeover. Public sources do not indicate active exploitation.
Executive priority
Treat as a timely patching item for Python web services, especially where users influence cookie contents. It is not currently supported as an emergency active-exploitation issue by the provided sources.
Technical view
The issue is CWE-93 header injection in http.cookies.Morsel. The CVSS 4.0 score is 6.0 with network attack vector, low complexity, low privileges required, and attack prerequisites present. The patch rejects control characters in cookie names, values, and parameters.
Likely exposure
Exposure is most likely in Python applications that use http.cookies.Morsel directly or indirectly with user-controlled cookie data. Listed affected CPython versions include 3.11.0, 3.12.0, 3.13.0, 3.14.0, and 3.15.0a1.
Exploitation context
Successful abuse depends on an application passing attacker-controlled cookie fields into Morsel. Sources do not report known exploitation, and the CVE is not listed as KEV in the provided data.
Researcher notes
Focus review on control-character handling in cookie serialization and framework wrappers around http.cookies.Morsel. The source bundle confirms patches across CPython commits but does not provide complete fixed-version mapping.
Mitigation direction
- Apply the Python Software Foundation patch or vendor-provided fixed CPython packages.
- Review PSF security advisory for exact fixed release guidance.
- Avoid placing unsanitized user input into cookie names, values, or parameters.
- Prioritize internet-facing applications that construct cookies from authenticated user input.
Validation and detection
- Inventory CPython versions used by applications and containers.
- Identify code paths using http.cookies.Morsel or cookie-building wrappers.
- Check whether cookie fields can include user-controlled data.
- Verify updated runtimes reject control characters in cookie fields.
- Review package-manager advisories for backported fixes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-93: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-0672 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6 (4.0)
- Known Exploited
- No
- Published
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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6MediumVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/python/cpython/pull/143920CVE reference · patch
- https://github.com/python/cpython/issues/143919CVE reference · issue-tracking
- https://mail.python.org/archives/list/security-announce@python.org/thread/6VFLQQEIX673KXKFUZXCUNE5AZOGZ45M/CVE reference · vendor-advisory
- https://github.com/python/cpython/commit/95746b3a13a985787ef53b977129041971ed7f70CVE reference · patch
- https://github.com/python/cpython/commit/712452e6f1d4b9f7f8c4c92ebfcaac1705faa440CVE reference · patch
- https://github.com/python/cpython/commit/62700107418eb2cca3fc88da036a243ea975f172CVE reference · patch
- https://github.com/python/cpython/commit/7852d72b653fea0199acf5fc2a84f6f8b84eba8dCVE reference · patch
- https://github.com/python/cpython/commit/918387e4912d12ffc166c8f2a38df92b6ec756caCVE reference · patch
- https://github.com/python/cpython/commit/b1869ff648bbee0717221d09e6deff46617f3e85CVE reference · patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of CRLF Sequences ('CRLF Injection')
Improper Neutralization of CRLF Sequences ('CRLF Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.