CVE-2026-123338
What it is
Out-of-bounds Write vulnerability in Apache DataSketches C++. An application that deserializes a REQ sketch from an untrusted source can have heap memory corrupted by a crafted sketch, because the serialized compactor headers were not validated. This issue affects Apache DataSketches C++: from 3.0.0 through 5.3.0. Users are recommended to upgrade to version 5.3.1, which fixes the issue.
At a glance
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: not scored yet.
- Severity: not scored yet.
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Weakness
- CWE-787 · Out-of-bounds write
- Record status
- Received
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-123338.md and follow it. Check whether this project is affected by CVE-2026-123338. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/apache/datasketches-cpp/commit/9839ffd2ccc038d453e38b545750a5ed2d589dea
- https://github.com/apache/datasketches-cpp/pull/568
- https://github.com/apache/datasketches-cpp/releases/tag/5.3.1
References
- https://github.com/apache/datasketches-cpp/commit/9839ffd2ccc038d453e38b545750a5ed2d589dea
- https://github.com/apache/datasketches-cpp/pull/568
- https://github.com/apache/datasketches-cpp/releases/tag/5.3.1
- https://lists.apache.org/thread/wjsso4wl0f0nczwh7gd74kc5wckn1635
- http://www.openwall.com/lists/oss-security/2026/11/13/2