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4 vulnerabilities found for flatted by WebReflection
CVE-2026-33228 (GCVE-0-2026-33228)
Vulnerability from nvd – Published: 2026-03-20 23:06 – Updated: 2026-06-27 05:17
VLAI
Title
flatted: Prototype Pollution via parse()
Summary
flatted is a circular JSON parser. Prior to version 3.4.2, the parse() function in flatted can use attacker-controlled string values from the parsed JSON as direct array index keys, without validating that they are numeric. Since the internal input buffer is a JavaScript Array, accessing it with the key "__proto__" returns Array.prototype via the inherited getter. This object is then treated as a legitimate parsed value and assigned as a property of the output object, effectively leaking a live reference to Array.prototype to the consumer. Any code that subsequently writes to that property will pollute the global prototype. This issue has been patched in version 3.4.2.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/WebReflection/flatted/security… | x_refsource_CONFIRM |
| https://github.com/WebReflection/flatted/commit/8… | x_refsource_MISC |
| https://github.com/WebReflection/flatted/releases… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-33228 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2449872 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:9742 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:13826 | vendor-advisoryx_refsource_REDHAT |
Impacted products
31 products
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CVE-2026-32141 (GCVE-0-2026-32141)
Vulnerability from nvd – Published: 2026-03-12 18:08 – Updated: 2026-03-13 16:20
VLAI
Title
flatted: Unbounded recursion DoS in parse() revive phase
Summary
flatted is a circular JSON parser. Prior to 3.4.0, flatted's parse() function uses a recursive revive() phase to resolve circular references in deserialized JSON. When given a crafted payload with deeply nested or self-referential $ indices, the recursion depth is unbounded, causing a stack overflow that crashes the Node.js process. This vulnerability is fixed in 3.4.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/WebReflection/flatted/security… | x_refsource_CONFIRM |
| https://github.com/WebReflection/flatted/pull/88 | x_refsource_MISC |
| https://github.com/WebReflection/flatted/commit/7… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| WebReflection | flatted |
Affected:
< 3.4.0
|
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CVE-2026-33228 (GCVE-0-2026-33228)
Vulnerability from cvelistv5 – Published: 2026-03-20 23:06 – Updated: 2026-06-27 05:17
VLAI
Title
flatted: Prototype Pollution via parse()
Summary
flatted is a circular JSON parser. Prior to version 3.4.2, the parse() function in flatted can use attacker-controlled string values from the parsed JSON as direct array index keys, without validating that they are numeric. Since the internal input buffer is a JavaScript Array, accessing it with the key "__proto__" returns Array.prototype via the inherited getter. This object is then treated as a legitimate parsed value and assigned as a property of the output object, effectively leaking a live reference to Array.prototype to the consumer. Any code that subsequently writes to that property will pollute the global prototype. This issue has been patched in version 3.4.2.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/WebReflection/flatted/security… | x_refsource_CONFIRM |
| https://github.com/WebReflection/flatted/commit/8… | x_refsource_MISC |
| https://github.com/WebReflection/flatted/releases… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-33228 | vdb-entryx_refsource_REDHAT |
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| https://access.redhat.com/errata/RHSA-2026:13826 | vendor-advisoryx_refsource_REDHAT |
Impacted products
31 products
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CVE-2026-32141 (GCVE-0-2026-32141)
Vulnerability from cvelistv5 – Published: 2026-03-12 18:08 – Updated: 2026-03-13 16:20
VLAI
Title
flatted: Unbounded recursion DoS in parse() revive phase
Summary
flatted is a circular JSON parser. Prior to 3.4.0, flatted's parse() function uses a recursive revive() phase to resolve circular references in deserialized JSON. When given a crafted payload with deeply nested or self-referential $ indices, the recursion depth is unbounded, causing a stack overflow that crashes the Node.js process. This vulnerability is fixed in 3.4.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/WebReflection/flatted/security… | x_refsource_CONFIRM |
| https://github.com/WebReflection/flatted/pull/88 | x_refsource_MISC |
| https://github.com/WebReflection/flatted/commit/7… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| WebReflection | flatted |
Affected:
< 3.4.0
|
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