Service interruption via unbounded and fatal STIX parsing
Published Aug 21, 2026 · Updated Aug 21, 2026
Denial of service in MISP-STIX 2026.7.8 and earlier allows attackers to interrupt importers via crafted STIX documents. The import path calls sys.exit() on parsing failures and materializes unbounded input before validating its size or type. Attackers must be able to supply STIX content to an import workflow; successful input terminates the importer or severely degrades its service.
Summary
What happened
Denial of service in MISP-STIX 2026.7.8 and earlier allows attackers to interrupt importers via crafted STIX documents. The import path calls sys.exit() on parsing failures and materializes unbounded input before validating its size or type. Attackers must be able to supply STIX content to an import workflow; successful input terminates the importer or severely degrades its service.
The record
- CVE
- CVE-2026-77755
- Published
- Aug 21, 2026
- Updated
- Aug 21, 2026
- Vendor
- MISP
- Product
- MISP-STIX
- Classifications
- T1499.004
- 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=2026.7.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo