CVE-2023-37187: C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the zfp/blosc2-zfp.c zfp_acc_de

Q: How do I fix CVE-2023-37187?

c-blosc2: upgrade to 2.9.3. Exact commands for each OS are on this page.

Q: Is CVE-2023-37187 being exploited?

CVE-2023-37187 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-37187 affect?

CVE-2023-37187 affects c-blosc2. Severity is high (CVSS 7.5). C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the zfp/blosc2-zfp.c zfp_acc_decompress. function.

Q: How urgent is CVE-2023-37187?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2023-37187 is a high-severity flaw (CVSS 7.5) affecting c-blosc2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-476
Published	2023-12-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: blosc

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-25 07:15 UTCPublished CVE record published
2026-06-17 06:07 UTCUpdated Record last modified

blosc c-blosc2 UPGRADE

Affected: < 2.9.3

Fixed in: 2.9.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy c-blosc2 || rpm -q c-blosc2 || c-blosc2 --version

2. UPGRADE to 2.9.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade c-blosc2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade c-blosc2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-37187?

c-blosc2: upgrade to 2.9.3. Exact commands for each OS are on this page.

Is CVE-2023-37187 being exploited?

CVE-2023-37187 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-37187 affect?

CVE-2023-37187 affects c-blosc2. Severity is high (CVSS 7.5). C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the zfp/blosc2-zfp.c zfp_acc_decompress. function.

How urgent is CVE-2023-37187?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-3204 HIGH 7.3 UPGRADE A vulnerability has been found in c-blosc2 up to 2.13.2 and classified as critical
CVE-2024-3203 HIGH 7.3 UPGRADE A vulnerability, which was classified as critical, was found in c-blosc2 up to 2.13.2
CVE-2023-37188 HIGH 7.5 UPGRADE C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the function zfp_rate_decompres
CVE-2023-37186 HIGH 7.5 UPGRADE C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference in ndlz/ndlz8x8.c via a NULL pointe
CVE-2023-37185 HIGH 7.5 UPGRADE C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the function zfp_prec_decompres

References

← Back to latest CVEs