CVE-2021-3918
9.8
CRITICAL · CVSS 3.1 · EPSS 3.8% (pctl 90)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
json-schema is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 3.83% — more likely to be exploited than 90% of all CVEs |
| Weakness | CWE-1321 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-11-13 |
| Last modified | 2026-06-17 |
Affected (2)
| Vendor | Product |
|---|---|
| debian | debian linux |
| json-schema project | json-schema |
References
- https://github.com/kriszyp/json-schema/commit/22f146111f541d9737e832823699ad3528ca7741
- https://huntr.dev/bounties/bb6ccd63-f505-4e3a-b55f-cd2662c261a9
- https://lists.debian.org/debian-lts-announce/2022/12/msg00013.html
- https://github.com/kriszyp/json-schema/commit/22f146111f541d9737e832823699ad3528ca7741
- https://huntr.dev/bounties/bb6ccd63-f505-4e3a-b55f-cd2662c261a9
- https://lists.debian.org/debian-lts-announce/2022/12/msg00013.html
- https://security.netapp.com/advisory/ntap-20250117-0004/
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