Marshmallow has DoS in Schema.load(many)
Priority LOW 30CWE-405Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
Marshmallow is a lightweight library for converting complex objects to and from simple Python datatypes. In versions from 3.0.0rc1 to before 3.26.2 and from 4.0.0 to before 4.1.2, Schema.load(data, many=True) is vulnerable to denial of service attacks. A moderately sized request can consume a disproportionate amount of CPU time. This issue has been patched in version 3.26.2 and 4.1.2.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00296 22nd percentileScored 2026-11-07
Fix Partial marshmallow (marshmallow-code): 3.26.2, 4.1.2marshmallow (PyPI): 3.26.2, 4.1.2Red Hat: 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| marshmallow-code | marshmallow | 3.0.0rc1 to before 3.26.2; 4.0.0 to before 4.1.2 | 3.26.2, 4.1.2 | Patch available | CNA |
| — | marshmallow (PyPI) | 3.0.0rc1 to before 3.26.2 | 3.26.2 | Patch available | GHSA-428g-f7cq-pgp5 |
| — | marshmallow (PyPI) | 4.0.0 to before 4.1.2 | 4.1.2 | Patch available | GHSA-428g-f7cq-pgp5 |
- marshmallow Vendormarshmallow-code Affected 3.0.0rc1 to before 3.26.2; 4.0.0 to before 4.1.2 Fixed in 3.26.2, 4.1.2 Patch available CNA
- marshmallow (PyPI) Vendor— Affected 3.0.0rc1 to before 3.26.2 Fixed in 3.26.2 Patch available GHSA-428g-f7cq-pgp5
- marshmallow (PyPI) Vendor— Affected 4.0.0 to before 4.1.2 Fixed in 4.1.2 Patch available GHSA-428g-f7cq-pgp5
Remediation
- Fix · CNA marshmallow (marshmallow-code) Fixed in 3.26.2, 4.1.2
- Fix · GHSA-428g-f7cq-pgp5 marshmallow (PyPI) Fixed in 3.26.2 Advisory →
- Fix · GHSA-428g-f7cq-pgp5 marshmallow (PyPI) Fixed in 4.1.2 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-68480
- 2026-10-03 Alias added: GHSA-428g-f7cq-pgp5
References
Sources
- CVE-2025-68480 · CVE Program
- CVE-2025-68480 · NVD
- FIRST EPSS
- GHSA-428g-f7cq-pgp5 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-68480 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences