Unspecified impact via scaffold allocation overflow
Published Jan 8, 2022 · Updated May 5, 2025
Integer overflow in nextScaffoldPart in Expat before 2.4.3 allows attackers to cause an unspecified impact through crafted XML. In nextScaffoldPart, xmlparse.c doubles dtd->scaffSize and multiplies it by the CONTENT_SCAFFOLD size for reallocation without first bounding either operation. Exploitation requires an application to parse attacker-controlled XML; upstream material does not specify the behavior after the allocation-size arithmetic wraps.
Summary
What happened
Integer overflow in nextScaffoldPart in Expat before 2.4.3 allows attackers to cause an unspecified impact through crafted XML. In nextScaffoldPart, xmlparse.c doubles dtd->scaffSize and multiplies it by the CONTENT_SCAFFOLD size for reallocation without first bounding either operation. Exploitation requires an application to parse attacker-controlled XML; upstream material does not specify the behavior after the allocation-size arithmetic wraps.
The record
- CVE
- CVE-2022-22826
- Published
- Jan 8, 2022
- Updated
- May 5, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-190, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 8, 2022CVE publishedPublication date reported by the CVE source.
- May 5, 2025Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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