OSV-2021-476

Heap-buffer-overflow in blosc_d

No scoreFix available

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31556

Crash type: Heap-buffer-overflow READ 4
Crash state:
blosc_d
do_job
blosc_run_decompression_with_context

What each source reports

OSV No score

Heap-buffer-overflow in blosc_d

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31556

Crash type: Heap-buffer-overflow READ 4
Crash state:
blosc_d
do_job
blosc_run_decompression_with_context

Record: OSV-2021-476
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.rc1v2.0.1v2.0.2v2.0.3v2.0.4	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-2021-476 is a vulnerability with no CVSS score yet in c-blosc2, published March 2, 2021. No source lists public exploit code. A source reports a fix.

References

bugs.chromium.org/p/oss-fuzz/issues/detail?id=31556