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EUVD-2026-13881Published

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 intern…

Exact source revision recorded 9 Nov 2026 08:10:03 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

euvd · EUVD-2026-13881

Published

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.

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Mar 20, 2026, 11:06:48 PM

dateUpdated: Sep 7, 2026, 12:05:12 PM

5 related source bulletins · separate from aliases

msrc_CVE-2026-33228: flatted: Prototype Pollution via parse()

CVE-2026-33228

RHSA-2026:86618: Red Hat Security Advisory: New container image: rhceph-9.2

CVE-2023-46159 · CVE-2024-47866 · CVE-2024-48916 · CVE-2024-55565 · CVE-2025-12816 · CVE-2025-15599 · CVE-2025-26791 · CVE-2025-30156 · CVE-2025-50181 · CVE-2025-50182 · CVE-2025-58754 · CVE-2025-59343 · CVE-2025-62718 · CVE-2025-66030 · CVE-2025-66035 · CVE-2025-66412 · CVE-2025-69873 · CVE-2026-0540 · CVE-2026-21441 · CVE-2026-22610 · CVE-2026-25639 · CVE-2026-26996 · CVE-2026-27903 · CVE-2026-27904 · CVE-2026-27970 · CVE-2026-32141 · CVE-2026-33228 · CVE-2026-33671 · CVE-2026-33672 · CVE-2026-33891 · CVE-2026-33894 · CVE-2026-33895 · CVE-2026-33896 · CVE-2026-39865 · CVE-2026-40175 · CVE-2026-40895 · CVE-2026-41238 · CVE-2026-41239 · CVE-2026-41240 · CVE-2026-41305 · CVE-2026-42033 · CVE-2026-42034 · CVE-2026-42035 · CVE-2026-42036 · CVE-2026-42037 · CVE-2026-42038 · CVE-2026-42039 · CVE-2026-42040 · CVE-2026-42041 · CVE-2026-42042 · CVE-2026-42043 · CVE-2026-42044 · CVE-2026-50152 · CVE-2026-58224

RHSA-2026:9742: Red Hat Security Advisory: Red Hat Developer Hub 1.8.6 release.

CVE-2025-62718 · CVE-2025-69534 · CVE-2025-69873 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-3118 · CVE-2026-4800 · CVE-2026-4926 · CVE-2026-25679 · CVE-2026-26996 · CVE-2026-27601 · CVE-2026-27904 · CVE-2026-29063 · CVE-2026-29074 · CVE-2026-29186 · CVE-2026-32141 · CVE-2026-33036 · CVE-2026-33228 · CVE-2026-33891 · CVE-2026-33894 · CVE-2026-33895 · CVE-2026-33896 · CVE-2026-39983 · CVE-2026-40175

RHSA-2026:34342: Red Hat Security Advisory: Cluster Observability Operator 1.5.0

CVE-2020-7753 · CVE-2021-33623 · CVE-2024-4068 · CVE-2024-45338 · CVE-2024-52011 · CVE-2025-22868 · CVE-2025-22870 · CVE-2025-22872 · CVE-2025-47911 · CVE-2025-58190 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-4800 · CVE-2026-4867 · CVE-2026-6321 · CVE-2026-6322 · CVE-2026-6734 · CVE-2026-9277 · CVE-2026-9697 · CVE-2026-12143 · CVE-2026-12151 · CVE-2026-25680 · CVE-2026-25681 · CVE-2026-29063 · CVE-2026-32141 · CVE-2026-33228 · CVE-2026-33671 · CVE-2026-33814 · CVE-2026-33891 · CVE-2026-33894 · CVE-2026-33895 · CVE-2026-33896 · CVE-2026-33937 · CVE-2026-33938 · CVE-2026-33939 · CVE-2026-33940 · CVE-2026-33941 · CVE-2026-39821 · CVE-2026-42506 · CVE-2026-48779

RHSA-2026:13826: Red Hat Security Advisory: Red Hat Developer Hub 1.9.4 release.

CVE-2025-62718 · CVE-2025-69534 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-3118 · CVE-2026-4800 · CVE-2026-4926 · CVE-2026-27601 · CVE-2026-27904 · CVE-2026-29063 · CVE-2026-29074 · CVE-2026-29186 · CVE-2026-32141 · CVE-2026-32280 · CVE-2026-32282 · CVE-2026-33228 · CVE-2026-33891 · CVE-2026-33894 · CVE-2026-33895 · CVE-2026-33896 · CVE-2026-39983 · CVE-2026-40175 · CVE-2026-40895

Source published
Mar 20, 2026, 11:06:48 PM (timezone not stated)
Source modified
Sep 7, 2026, 12:05:12 PM (timezone not stated)
Observed here
9 Nov 2026 08:10:03 UTC
Source terms
ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 4.0 · 8.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

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Sources read 11 Nov 21:06 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current

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