Quick answers
- Is CVE-2026-90559 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-90559 being exploited in the wild.
- How severe is CVE-2026-90559?
- High severity, with a CVSS score of 7.5, published 12 September 2026.
- Which products and versions are affected?
- Xerial Snappy-Java through 1.1.10.8.
- Is there a fix for CVE-2026-90559?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-90559 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-90559?
- Check whether you run Xerial Snappy-Java at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an out-of-bounds write in the Snappy.uncompress(ByteBuffer, ByteBuffer) method, which does not validate the destination buffer capacity against the decompressed output size. An attacker can craft valid compressed data that decompresses to a size larger than the destination buffer, causing memory writes past buffer boundaries. This occurs when decompressing attacker-controlled compressed payloads, without requiring authentication or prior access. Exploitation results in JVM termination and potential denial of service; code execution impact is not confirmed. Patches are expected in versions after 1.1.10.8.
Affected products
- Xerial snappy-java through 1.1.10.8
Timeline
- 2026-09-12: disclosed