OSV-2021-997

Heap-buffer-overflow in ZSTD_createDDict_advanced

No scoreFix available

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=36103

Crash type: Heap-buffer-overflow READ {*}
Crash state:
ZSTD_createDDict_advanced
ZSTD_createDDict
blosc_run_decompression_with_context

What each source reports

OSV No score

Heap-buffer-overflow in ZSTD_createDDict_advanced

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=36103

Crash type: Heap-buffer-overflow READ {*}
Crash state:
ZSTD_createDDict_advanced
ZSTD_createDDict
blosc_run_decompression_with_context

Record: OSV-2021-997
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`c-blosc2` OSS-Fuzz	Listed versions, plus commit ranges v2.0.0v2.0.0-rc2v2.0.0.rc1v2.0.1v2.0.2 Show 4 moreShow less v2.0.3v2.0.4v2.1.0v2.1.1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

OSV-2021-997 is a vulnerability with no CVSS score yet in c-blosc2, published July 14, 2021. No source lists public exploit code. A source reports a fix.

References

bugs.chromium.org/p/oss-fuzz/issues/detail?id=36103