CVE-2024-36124: iq80 Snappy has an out-of-bounds read when uncompressing data, leading to JVM crash

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-03 · updated 2026-06-17
Weakness: CWE-125

Description

iq80 Snappy is a compression/decompression library. When uncompressing certain data, Snappy tries to read outside the bounds of the given byte arrays. Because Snappy uses the JDK class `sun.misc.Unsafe` to speed up memory access, no additional bounds checks are performed and this has similar security consequences as out-of-bounds access in C or C++, namely it can lead to non-deterministic behavior or crash the JVM. iq80 Snappy is not actively maintained anymore. As quick fix users can upgrade to version 0.5.

Affected products

dain snappy: before 0.5 — fixed in 0.5

How to fix

Upgrade to a fixed version: dain snappy 0.5. Check the vendor advisory for mitigations.

References

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