Description (CNA)
Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring authentication, external entity resolution, or non-default parser options.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| libexpat project / libexpat | affected 0 through 2.8.3 |
CWE
CWE-407
References
- https://github.com/libexpat/libexpat/pull/1321
- https://www.vulncheck.com/advisories/expat-denial-of-service-via-storeatts-quadratic-complexity
ADP enrichment
No English description supplied.
No references supplied.