What’s Vulnerable › Vulnerabilities

CVE-2021-3757: Prototype Pollution in immerjs/immer

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-02 · updated 2026-06-17
• Weakness: CWE-1321

Description

immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Affected products

• immer: through 9.0.5

References

• https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237
• https://huntr.dev/bounties/23d38099-71cd-42ed-a77a-71e68094adfa
• https://github.com/immerjs/immer/commit/fa671e55ee9bd42ae08cc239102b665a23958237
• https://huntr.dev/bounties/23d38099-71cd-42ed-a77a-71e68094adfa

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