Vulnerability Description
Heap type confusion vulnerability in Apache Fory C++ deserialization. This issue affects Apache Fory C++ versions from 0.14.0 before 1.5.0. A crafted input payload can bypass type compatibility checks during polymorphic smart-pointer deserialization, causing an object of an incompatible type to be treated as the declared base type. This may result in undefined behavior and potentially lead to denial of service or arbitrary code execution. Users are recommended to upgrade to Apache Fory 1.5.0, which fixes this issue. Applications not using Apache Fory C++ polymorphic smart-pointer deserialization are not affected.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Fory | >= 0.14.0, < 1.5.0 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/oywndv60jwqdv6j37t7bc1qbcc4b235rMailing ListVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/08/07/3Mailing ListThird Party Advisory
FAQ
What is CVE-2026-71558?
CVE-2026-71558 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Heap type confusion vulnerability in Apache Fory C++ deserialization. This issue affects Apache Fory C++ versions from 0.14.0 before 1.5.0. A crafted input payload can bypass type compatibility check...
How severe is CVE-2026-71558?
CVE-2026-71558 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-71558?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Fory.