Denial of service via allocation amplification
Published Sep 15, 2025 · Updated Jul 14, 2026
Resource exhaustion in Expat libexpat before 2.7.2 allows remote attackers to crash parsing processes with a small XML document. Each opening XML tag causes a fixed-size TAG structure and buffer allocation, allowing roughly 250 KiB of input to consume about 800 MiB of heap. Exploitation requires a consuming application to parse attacker-controlled XML; the consequence is process termination or service interruption from memory exhaustion.
Summary
What happened
Resource exhaustion in Expat libexpat before 2.7.2 allows remote attackers to crash parsing processes with a small XML document. Each opening XML tag causes a fixed-size TAG structure and buffer allocation, allowing roughly 250 KiB of input to consume about 800 MiB of heap. Exploitation requires a consuming application to parse attacker-controlled XML; the consequence is process termination or service interruption from memory exhaustion.
The record
- CVE
- CVE-2025-59375
- Published
- Sep 15, 2025
- Updated
- Jul 14, 2026
- Vendor
- Siemens
- Product
- SCALANCE XRM334 (24 V DC, 12xFO)
- Classifications
- CWE-770, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 15, 2025CVE publishedPublication date reported by the CVE source.
- Jul 14, 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 <V3.3
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Technologies
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Your stack
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