Service interruption via malformed Markdown infinite loop
Published Dec 9, 2025 · Updated Dec 9, 2025
Denial of service in SAPUI5 SAP_UI 755 through 758 allows remote attackers to interrupt service with malformed Markdown input. The embedded markdown-it parser fails to terminate when it processes specially malformed input, entering an infinite loop that consumes CPU and blocks its processing thread. Exploitation requires no authentication but depends on specially crafted input; the resulting unresponsiveness affects availability without reported data exposure or modification.
Summary
What happened
Denial of service in SAPUI5 SAP_UI 755 through 758 allows remote attackers to interrupt service with malformed Markdown input. The embedded markdown-it parser fails to terminate when it processes specially malformed input, entering an infinite loop that consumes CPU and blocks its processing thread. Exploitation requires no authentication but depends on specially crafted input; the resulting unresponsiveness affects availability without reported data exposure or modification.
The record
- CVE
- CVE-2025-42873
- Published
- Dec 9, 2025
- Updated
- Dec 9, 2025
- Vendor
- SAP SE
- Product
- SAPUI5
- Classifications
- CWE-405, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 9, 2025CVE publishedPublication date reported by the CVE source.
- Dec 9, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=756
- Affected versionversion=757
- Affected versionversion=758
- Affected versionversion=SAP_UI 755
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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