CVE-2026-90559: Out-of-bounds Write in xerial snappy-java
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.
AI Analysis
Technical Summary
The vulnerability in snappy-java (<=1.1.10.8) arises because the destination ByteBuffer capacity is never checked against the size of decompressed data in the Snappy.uncompress method. An attacker can provide compressed data that decompresses to a size larger than the destination buffer, resulting in out-of-bounds writes. This memory corruption can cause the Java Virtual Machine to terminate unexpectedly.
Potential Impact
Successful exploitation can cause out-of-bounds memory writes leading to JVM crashes or termination. There is no indication of privilege escalation or code execution from the provided data. The impact is denial of service via JVM termination.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted compressed data with vulnerable versions of snappy-java.
CVE-2026-90559: Out-of-bounds Write in xerial snappy-java
Description
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.
CVSS v4.0
Score 8.7high
Affected software
xerial
snappy-java
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in snappy-java (<=1.1.10.8) arises because the destination ByteBuffer capacity is never checked against the size of decompressed data in the Snappy.uncompress method. An attacker can provide compressed data that decompresses to a size larger than the destination buffer, resulting in out-of-bounds writes. This memory corruption can cause the Java Virtual Machine to terminate unexpectedly.
Potential Impact
Successful exploitation can cause out-of-bounds memory writes leading to JVM crashes or termination. There is no indication of privilege escalation or code execution from the provided data. The impact is denial of service via JVM termination.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted compressed data with vulnerable versions of snappy-java.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-12T11:13:43.326Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa5974855bf5e2cf597728b
Added to database: 09/12/2026, 18:17:44 UTC
Last enriched: 09/12/2026, 18:31:30 UTC
Last updated: 09/13/2026, 03:10:14 UTC
Views: 12
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.