Process memory over-read via unchecked error cursor
Published May 13, 2024 · Updated Nov 4, 2025
Buffer over-read in XMLSoft xmllint before 2.11.8 and 2.12.0 through 2.12.6 allows local users to read outside an input buffer. The xmlHTMLPrintFileContext routine walks backward over newline and carriage-return bytes while formatting --htmlout errors but fails to stop at the buffer base. Exploitation requires local execution with --htmlout and input that provokes error-context formatting; the bounded consequence is an out-of-bounds read in that process.
Summary
What happened
Buffer over-read in XMLSoft xmllint before 2.11.8 and 2.12.0 through 2.12.6 allows local users to read outside an input buffer. The xmlHTMLPrintFileContext routine walks backward over newline and carriage-return bytes while formatting --htmlout errors but fails to stop at the buffer base. Exploitation requires local execution with --htmlout and input that provokes error-context formatting; the bounded consequence is an out-of-bounds read in that process.
The record
- CVE
- CVE-2024-34459
- Published
- May 13, 2024
- Updated
- Nov 4, 2025
- Vendor
- XMLSoft
- Product
- xmllint
- Classifications
- CWE-122
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- May 13, 2024CVE publishedPublication date reported by the CVE source.
- Nov 4, 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 <2.11.8
- Affected versionversion=2.12.0 <2.12.7
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
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Technologies
Your stack
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Your stack
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