What is CVE-2023-37188?

CVE-2023-37188 is a high-severity vulnerability in Blosc C-Blosc2, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2023-12-25.

How severe is CVE-2023-37188?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2023-37188 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Blosc C-Blosc2

CVE-2023-37188

C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the function zfp_rate_decompress at zfp/blosc2-zfp.c.

Published 2023-12-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Blosc C-Blosc2

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

DiRaltvein/memory-corruption-examples

References

github.com/Blosc/c-blosc2/commit/425e8a9a59d49378d57e2116b6c9b0190a5986f5 (Patch)
github.com/Blosc/c-blosc2/issues/521 (Exploit, Patch, Issue Tracking, Vendor Advisory)
github.com/Blosc/c-blosc2/compare/v2.9.2...v2.9.3 (Release Notes)

Frequently asked questions

What is CVE-2023-37188?: CVE-2023-37188 is a high-severity vulnerability in Blosc C-Blosc2, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2023-12-25.
How severe is CVE-2023-37188?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-37188 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.