CVE-2023-37186Public exploitNetwork attack vector

Process crash via unchecked NDLZ output pointer

Published Dec 25, 2023 · Updated Aug 2, 2024

A NULL pointer dereference in C-Blosc2 before 2.9.3 allows attackers to crash a consuming process by supplying a crafted NDLZ chunk. In ndlz8_decompress, inadequate validation permits the output-size calculation to overflow and execution to reach memset with a null output pointer. Any application that decompresses attacker-controlled NDLZ data can terminate, but the published evidence shows no data disclosure or code execution.

CVSS severity7.5
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in C-Blosc2 before 2.9.3 allows attackers to crash a consuming process by supplying a crafted NDLZ chunk. In ndlz8_decompress, inadequate validation permits the output-size calculation to overflow and execution to reach memset with a null output pointer. Any application that decompresses attacker-controlled NDLZ data can terminate, but the published evidence shows no data disclosure or code execution.

The record

CVE
CVE-2023-37186
Published
Dec 25, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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