Blosc C-Blosc2 up to 3.3.2 blosclz Decompression blosc/blosclz.c blosclz_decompress integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k1.70

Summaryinfo

A vulnerability marked as problematic has been reported in Blosc C-Blosc2 up to 3.3.2. Affected is the function blosclz_decompress of the file blosc/blosclz.c of the component blosclz Decompression. The manipulation leads to integer overflow. This vulnerability is referenced as CVE-2026-103222. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Blosc C-Blosc2 up to 3.3.2. This issue affects the function blosclz_decompress of the file blosc/blosclz.c of the component blosclz Decompression. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-103222. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 3.3.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch fe2964d114d97847f56570a0ab2be2c57ccbeedc is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: C-Blosc2 3.3.3
Patch: fe2964d114d97847f56570a0ab2be2c57ccbeedc

Timelineinfo

09/30/2026 Advisory disclosed
09/30/2026 +0 days VulDB entry created
09/30/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: fe2964d114d97847f56570a0ab2be2c57ccbeedc
Status: Confirmed

CVE: CVE-2026-103222 (🔒)
GCVE (CVE): GCVE-0-2026-103222
GCVE (VulDB): GCVE-100-411905

Entryinfo

Created: 09/30/2026 09:30
Changes: 09/30/2026 09:30 (60)
Complete: 🔍
Submitter: zzxzzb
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #954976: Blosc c-blosc2 >= 2.0.0, < fix commit fe2964d114d9 Memory Corruption (by zzxzzb)

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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