An issue was discovered in webargs before 5.1.3, as used with marshmallow and other…
Priority LOW 37CWE-362Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.
Summary
An issue was discovered in webargs before 5.1.3, as used with marshmallow and other products. JSON parsing uses a short-lived cache to store the parsed JSON body. This cache is not thread-safe, meaning that incorrect JSON payloads could have been parsed for concurrent requests.
Why it matters now
EPSS 0.01124 66th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed webargs (PyPI): 5.1.3
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | webargs (PyPI) | before 5.1.3 | 5.1.3 | Patch available | GHSA-8554-jxcw-454q |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- webargs (PyPI) Vendor— Affected before 5.1.3 Fixed in 5.1.3 Patch available GHSA-8554-jxcw-454q
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:webargs_project:webargs:*:*:*:*:*:*:*:* | before 5.1.3 | Vulnerable | Webargs Project |
- cpe:2.3:a:webargs_project:webargs:*:*:*:*:*:*:*:* Versions before 5.1.3 Vulnerable ·Webargs Project
Remediation
- Fix · GHSA-8554-jxcw-454q webargs (PyPI) Fixed in 5.1.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2019-9710
- 2026-10-03 Alias added: GHSA-8554-jxcw-454q
References
Advisory 2
Other 5
- https://github.com/marshmallow-code/webargs/pull/373
- https://github.com/marshmallow-code/webargs/commit/716bd8d1f24c84aaf99170efaa17d1d34206f6c0
- https://github.com/marshmallow-code/webargs
- https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2019-139.yaml
- https://webargs.readthedocs.io/en/latest/changelog.html#id24
More Webargs Project Webargs vulnerabilities
- TI-2020-06443 flaskparser.py in Webargs 5.x through 5.5.2 doesn't check that the Content-Type header is… CVSS 3.1HIGH 8.8
Sources
- CVE-2019-9710 · CVE Program
- CVE-2019-9710 · NVD
- FIRST EPSS
- GHSA-8554-jxcw-454q · GitHub Advisory Database · CC BY 4.0
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