CVE-2026-32141: WebReflection flatted · Uncontrolled Recursion
Affects WebReflection flattedSource CVE Database V5
Not known to be exploited · CVSS 7.5 High : upgrade to 3.4.0 soon.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.8% chance of exploitation in 30 days – higher than 57% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 3.4.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 12 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade WebReflection flatted to 3.4.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| WebReflectionflatted | Affected
| Fixed in
|
npmflattedpkg:npm/flattedOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available in flatted version 3.4.0. Users should upgrade to version 3.4.0 or later to remediate this vulnerability. The Red Hat advisory notes that no alternative mitigations meet their criteria for ease of use and applicability, so upgrading is the recommended action.
Description
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.
References
- github.com/WebReflection/flatted/security/advisories/GHSA-25h7-pfq9-p65f (opens in a new tab)
- github.com/WebReflection/flatted/pull/88 (opens in a new tab)
- github.com/WebReflection/flatted/commit/7eb65d857e1a40de11c47461cdbc8541449f0606 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-32141 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2447083 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32141.json (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:34342 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:9742 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:13826 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:36651 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:40945 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:40118 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:5807 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21772 (opens in a new tab)