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PatchSiren cyber security CVE debrief

CVE-2026-114198 Mandiant FLARE CVE debrief

CVE-2026-114198 is a high-severity vulnerability in Mandiant FLARE floss releases before 3.2.0, allowing arbitrary code execution when a crafted .viv or .exe.viv workspace is passed to the floss utility. The vulnerability has a CVSS score of 8.7 and is classified as HIGH. The CVE record was published on 2026-10-21T00:39:47.288Z and has not been modified since then.

Vendor
Mandiant FLARE
Product
floss
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-21
Original CVE updated
2026-10-21
Advisory published
2026-10-21
Advisory updated
2026-10-21

Who should care

Defenders responsible for Mandiant FLARE floss installations, especially those processing untrusted workspaces, should assess exposure and prioritize patching.

Why it matters

CVE-2026-114198 is a high-severity vulnerability in Mandiant FLARE floss releases before 3.2.0, allowing arbitrary code execution. Defenders should prioritize patching vulnerable installations, especially in environments where untrusted workspaces are processed.

  • Potential arbitrary code execution
  • Need for patching vulnerable installations
  • Importance of restricting access to floss utility

Technical summary

The vulnerability is caused by deserialization of untrusted data in Mandiant FLARE floss releases before 3.2.0. This allows arbitrary code execution when a crafted .viv or .exe.viv workspace is passed to the floss utility. Affected product deployments should be confirmed in managed environments, with an owner assigned for follow-up. The vulnerability has a CVSS score of 8.7 and is classified as HIGH. Defenders should prioritize patching vulnerable floss installations, especially in environments where untrusted workspaces are processed.

Defensive priority

Defenders should prioritize patching vulnerable floss installations, especially in environments where untrusted workspaces are processed.

Recommended defensive actions

  • Patch vulnerable floss installations
  • Restrict access to floss utility
  • Monitor for suspicious workspace uploads

Evidence notes

The vulnerability is described in the CVE record and the source item from cve_program_cvelist_v5. The affected vendor, Mandiant FLARE, is also mentioned. However, there is limited information on potential exploits or victims.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-114198 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-114198

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-114198 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-114198

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Deserialization of untrusted data in floss

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/114xxx/CVE-2026-114198.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0036.md

    Supplemental source - third-party-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.