LiveActive security incident?Get immediate response
CVE Record

CVE-2026-24486: Python-Multipart has Arbitrary File Write via Non-Default Configuration

Python-Multipart is a streaming multipart parser for Python. Prior to version 0.0.22, a Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename. Users should upgrade to version 0.0.22 to receive a patch or, as a workaround, avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations.

HighCVSS 8.6Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw affects python-multipart before 0.0.22 only when applications enable specific non-default upload settings. In that configuration, an unauthenticated attacker could cause uploaded files to be written outside the intended upload directory, potentially overwriting sensitive files or disrupting service.

Executive priority

Treat as a high-priority patching item for internet-facing upload services. Prioritize systems that preserve uploaded filenames or use packaged Red Hat components covered by the listed advisories.

Technical view

CVE-2026-24486 is a CWE-22 path traversal issue in Kludex python-multipart before 0.0.22. The vulnerable condition requires UPLOAD_DIR with UPLOAD_KEEP_FILENAME=True. Malicious filenames can escape the intended path and cause arbitrary file writes. CVSS is 8.6 high.

Likely exposure

Exposure is most likely in Python web applications using python-multipart below 0.0.22 and preserving client-supplied upload filenames. Default configurations are not described as vulnerable in the source bundle.

Exploitation context

The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. The attack is network-accessible, low-complexity, and unauthenticated when the vulnerable configuration is reachable through file upload functionality.

Researcher notes

The key constraint is configuration-dependent impact. Validate both package version and runtime settings before assigning exposure. The available sources identify the patched version and workaround but do not provide evidence of active exploitation.

Mitigation direction

  • Upgrade python-multipart to version 0.0.22 or later.
  • Disable UPLOAD_KEEP_FILENAME=True where it is configured.
  • Avoid trusting client-supplied filenames for filesystem paths.
  • Review Red Hat advisories if consuming python-multipart through Red Hat packages.
  • Check vendor guidance for environment-specific remediation details.

Validation and detection

  • Inventory applications and containers for python-multipart versions below 0.0.22.
  • Search configuration for UPLOAD_DIR combined with UPLOAD_KEEP_FILENAME=True.
  • Identify exposed upload endpoints using python-multipart.
  • Verify deployed builds use python-multipart 0.0.22 or later.
  • Review logs and file integrity alerts for unexpected upload-path writes.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

CWE-22: File access and web shell behavior lookup

File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookup
description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-24486 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
8.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Official CVE source material

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.

2CVSS vectors
5Timeline events
2ADP providers
15Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L3.94.7GitHub_M
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L3.94.7redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.6High
CVSS 3.1 vector shape for CVE-2026-24486Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPpython-multipart: Python-Multipart: Arbitrary file write via path traversal vulnerability
other:Red Hat severity ratingcvssV3_1
  • 2026-01-27T01:00:58.032Z: Reported to Red Hat.
  • 2026-01-27T00:34:06.229Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Kludexpython-multipart< 0.0.22Listed
Weakness

CWE details

CWE-22

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.