Local crash via include substring over-read
Published Sep 26, 2025 · Updated Sep 26, 2025
Heap-buffer over-read in Vsevolod Stakhov libucl 0.9.0 through 0.9.2 allows local users to crash a parsing process. The ucl_strnstr helper calls strncmp without first ensuring that the remaining bounded input is at least as long as the search string, reading beyond the heap buffer during .include handling. The path requires locally supplied UCL input that reaches include processing; the published reproducer demonstrates an instrumented-process abort, not code execution.
Summary
What happened
Heap-buffer over-read in Vsevolod Stakhov libucl 0.9.0 through 0.9.2 allows local users to crash a parsing process. The ucl_strnstr helper calls strncmp without first ensuring that the remaining bounded input is at least as long as the search string, reading beyond the heap buffer during .include handling. The path requires locally supplied UCL input that reaches include processing; the published reproducer demonstrates an instrumented-process abort, not code execution.
The record
- CVE
- CVE-2025-11010
- Published
- Sep 26, 2025
- Updated
- Sep 26, 2025
- Vendor
- Vsevolod Stakhov
- Product
- libucl
- Classifications
- CWE-122, CWE-119
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 26, 2025CVE publishedPublication date reported by the CVE source.
- Sep 26, 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=0.9.0
- Affected versionversion=0.9.1
- Affected versionversion=0.9.2
What conditions does exploitation require?
What is affected?
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
- ucl_strnstr crafted-input reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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