Skip to content
Noroxi
CVE-2024-3203· NVD / CVE Program· CNA VulDB

c-blosc2 ndlz8x8.c ndlz8_decompress heap-based overflow

A vulnerability, which was classified as critical, was found in c-blosc2 up to 2.13.2. Affected is the function ndlz8_decompress of the file /src/c-blosc2/plugins/codecs/ndlz/ndlz8x8.c. The manipulation leads to heap-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 2.14.3 is able to address this issue. It is recommended to upgrade the affected component. VDB-259050 is the identifier assigned to this vulnerability.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Apr 2, 2024
Updated
Jun 17, 2026
EPSS
1.3% · 71th percentile
Follow this CVE

Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.8
CNA · VulDB
7.3
2.5 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Affected systems

VendorProduct
bloscc-blosc2

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • blosc c-blosc2up to 2.13.2 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a c-blosc2

    • 2.13.0, 2.13.1, 2.13.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13c-blosc2before 2.13.1+ds-32.13.1+ds-3

Same product

blosc: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-3204c-blosc2 ndlz4x4.c ndlz4_decompress heap-based overflow
    39Monitor
  • CVE-2020-29367blosc2.c in Blosc C-Blosc2 through 2.0.0.beta.5 has a heap-based buffer overflow when there is a lack of space to write compressed data.
    31Monitor
  • CVE-2023-37188C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the function zfp_rate_decompress at zfp/blosc2-zfp.c.
    30Monitor
  • CVE-2023-37187C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the zfp/blosc2-zfp.c zfp_acc_decompress.
    30Monitor
  • CVE-2023-37186C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference in ndlz/ndlz8x8.c via a NULL pointer to memset.
    30Monitor
  • CVE-2023-37185C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the function zfp_prec_decompress at zfp/blosc2-zfp.c.
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
n/a c-blosc22.14.3 · descriptionVendor (CNA)
debian:c-blosc22.13.1+ds-3 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-32040 days apartc-blosc2 ndlz4x4.c ndlz4_decompress heap-based overflow
    39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records