CVE-2024-3203Public exploitNetwork attack vector

Process memory corruption via unchecked NDLZ offsets

Published Apr 2, 2024 · Updated Aug 1, 2024

Heap-based buffer overflow in C-Blosc2 2.13.0 through 2.13.2 allows remote attackers to corrupt process memory via crafted NDLZ data. The ndlz8_decompress function parses token-controlled offsets and copies referenced or literal rows into 8-by-8 cell buffers without first validating all input boundaries. Reachability requires a host application to pass untrusted compressed data to the NDLZ 8-by-8 codec; authoritative sources establish memory corruption but not code execution.

CVSS severity9.8
Critical
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in C-Blosc2 2.13.0 through 2.13.2 allows remote attackers to corrupt process memory via crafted NDLZ data. The ndlz8_decompress function parses token-controlled offsets and copies referenced or literal rows into 8-by-8 cell buffers without first validating all input boundaries. Reachability requires a host application to pass untrusted compressed data to the NDLZ 8-by-8 codec; authoritative sources establish memory corruption but not code execution.

The record

CVE
CVE-2024-3203
Published
Apr 2, 2024
Updated
Aug 1, 2024
Vendor
Blosc
Product
C-Blosc2
Classifications
CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.13.0
  2. Affected versionversion=2.13.1
  3. Affected versionversion=2.13.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Blosc · C-Blosc2version=2.13.0; version=2.13.1; version=2.13.2

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

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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