CVE-2026-4800High· 8.1▾ MidnightPoC availableImpact: The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the s…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 44.6 · likelihood 0.6 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
1.7%
1.7% → 2.8%
2 GitHub repos
Last analysed / modified upstream
Impact:
The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink.
When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time.
Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function().
Patches:
Users should upgrade to version 4.18.0.
Workarounds:
Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.
lodash >= 4.0.0, < 4.18.0lodash-amd >= 4.0.0, < 4.18.0lodash-es >= 4.0.0, < 4.18.0lodash.template >= 4.0.0, < 4.18.0Upgrade past the affected range:
lodash 4.18.0lodash-amd 4.18.0lodash-es 4.18.0lodash.template 4.18.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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