CVE-2019-9710
Webargs mishandles concurrent JSON parsing
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2019-9710- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-362
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2019-9710- Updated
- 2026-11-02
EUVDEUVD-2019-0159 No score
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.
- Record
EUVD-2019-0159- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8554-jxcw-454q
Webargs mishandles concurrent JSON parsing
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.
- Record
GHSA-8554-jxcw-454q- CVSS 4.0
- 8.2 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P - CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-362
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2019-9710- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-8554-jxcw-454q
Webargs mishandles concurrent JSON parsing
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.
- Record
GHSA-8554-jxcw-454q- CVSS 4.0
- 8.2 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P - CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-362
- Updated
- 2026-11-02
OSVPYSEC-2019-139 No score
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.
- Record
PYSEC-2019-139- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
webargsPyPI |
before 5.1.3 | 5.1.3 |
webargsPyPI |
before 5.1.3, plus listed versions 0.1.00.10.00.11.00.12.00.13.0 Show 45 moreShow less0.14.00.15.00.16.00.17.00.18.00.2.00.3.00.3.10.3.20.3.30.3.40.4.00.5.00.5.10.6.00.6.10.6.20.7.00.8.00.8.10.9.00.9.11.0.01.1.01.1.11.10.01.2.01.3.01.3.11.3.21.3.31.3.41.4.01.5.01.5.11.5.21.5.31.6.01.6.11.6.21.6.31.7.01.8.01.8.11.9.0 |
5.1.3 |
webargsPyPI |
before 5.1.3, plus listed versions 0.1.00.2.00.3.00.3.10.3.2 Show 45 moreShow less0.3.30.3.40.4.00.5.00.5.10.6.00.6.10.6.20.7.00.8.00.8.10.9.00.9.10.10.00.11.00.12.00.13.00.14.00.15.00.16.00.17.00.18.01.0.01.1.01.1.11.2.01.3.01.3.11.3.21.3.31.3.41.4.01.5.01.5.11.5.21.5.31.6.01.6.11.6.21.6.31.7.01.8.01.8.11.9.01.10.0 |
5.1.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-9710 is a high vulnerability (CVSS 8.1) in Webargs Project Webargs, published March 12, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.12%, the 66th percentile. Fixed in webargs 5.1.3.
References
webargs.readthedocs.io/en/latest/changelog.html
github.com/marshmallow-code/webargs/issues/371
nvd.nist.gov/vuln/detail/CVE-2019-9710
Left out here: 40 versions. The JSON record has them.