Buffer overflow in Xerial Snappy-Java
CVE-2026-90559
snappy-java through 1.1.10.8 contains an out-of-bounds write vulnerability in Snappy.uncompress(ByteBuffer, ByteBuffer) because destination buffer capacity is never validated against decompressed size. Attackers can supply valid compressed data that decompresses larger than the destination buffer, causing writes past buffer boundaries and JVM termination.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (50.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/xerial/snappy-java (product)
- github.com/xerial/snappy-java/blob/v1.1.10.8/src/main/java/org/xerial/snappy/Sn… (technical-description)
- github.com/xerial/snappy-java/issues/728 (issue-tracking)
- www.vulncheck.com/advisories/snappy-java-through-1.1.10.8-out-of-bounds-write-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90559?
- CVE-2026-90559 is a high-severity vulnerability in Xerial Snappy-Java, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-09-12.
- How severe is CVE-2026-90559?
- High severity. CVSS v3 base score is 7.5 out of 10.