Threat-intelligence corruption via retained parser state
Published Aug 21, 2026 · Updated Aug 21, 2026
Parser state isolation failure in MISP-STIX 2026.7.8 and earlier allows attackers to contaminate later MISP events via crafted STIX documents. Reused STIX 1 and STIX 2 parser instances fail to clear galaxies, references, passive DNS bookkeeping, titles, dates, and timestamps between conversions. Exploitation requires application-level parser reuse and controlled document ordering, enabling false associations and limited cross-scope disclosure without code execution or service interruption.
Summary
What happened
Parser state isolation failure in MISP-STIX 2026.7.8 and earlier allows attackers to contaminate later MISP events via crafted STIX documents. Reused STIX 1 and STIX 2 parser instances fail to clear galaxies, references, passive DNS bookkeeping, titles, dates, and timestamps between conversions. Exploitation requires application-level parser reuse and controlled document ordering, enabling false associations and limited cross-scope disclosure without code execution or service interruption.
The record
- CVE
- CVE-2026-77761
- Published
- Aug 21, 2026
- Updated
- Aug 21, 2026
- Vendor
- MISP
- Product
- MISP-STIX
- Classifications
- T1565.001
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 21, 2026CVE publishedPublication date reported by the CVE source.
- Aug 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <=2026.7.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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