snappy-java: Heap buffer overflow in Snappy.uncompress*Array typed-array methods
CVE-2026-93451
Impact Snappy.uncompressCharArray, uncompressShortArray, uncompressIntArray, uncompressLongArray, uncompressFloatArray and uncompressDoubleArray sized the result array by dividing the declared uncompressed byte length by the element size, but native code wrote the full byte length. If the declared length is not a multiple of the element size, up to 7 bytes are written past the end of the Java array, corrupting the heap. Patches Fixed in 1.1.10.9 ([#739](https://github.com/xerial/snappy-java/pull/739)). These methods now reject uncompressed lengths that are not a multiple of the element size with SnappyIOException. Workarounds Check that Snappy.uncompressedLength(input) is a multiple of the element size before calling these methods.
Assessment
- CVSS
- 7.5 (v3.1)
- Severity
- High
- EPSS
- 0.00296% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 27 October 2026
- Last updated
- 27 October 2026
- Affected
- maven · org.xerial.snappy:snappy-java
- Weakness
- CWE-193, CWE-787
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
At the source
References
- https://github.com/xerial/snappy-java/security/advisories/GHSA-gwq9-9ffj-mvrv
- https://nvd.nist.gov/vuln/detail/CVE-2026-93451
- https://github.com/xerial/snappy-java/issues/729
- https://github.com/xerial/snappy-java/pull/739
- https://github.com/xerial/snappy-java/commit/943c6043a292568575e8347af4507d015e802c75
- https://github.com/xerial/snappy-java/blob/v1.1.10.8/src/main/java/org/xerial/snappy/Snappy.java#L802
- https://github.com/xerial/snappy-java/releases/tag/v1.1.10.9
- https://www.vulncheck.com/advisories/snappy-java-through-1.1.10.8-buffer-overflow-via-typed-uncompress-methods
- https://github.com/advisories/GHSA-gwq9-9ffj-mvrv
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