CVE-2026-103222: Integer Overflow in Blosc C-Blosc2
CVE-2026-103222 is an integer overflow vulnerability in the Blosc C-Blosc2 library affecting versions 3.3.0, 3.3.1, and 3.3.2. The flaw exists in the blosclz_decompress function within the blosc/blosclz.c component. Exploitation requires high complexity and is considered difficult, but it can be triggered remotely. The issue is resolved by upgrading to version 3.3.3.
AI Analysis
Technical Summary
An integer overflow vulnerability was identified in the blosclz_decompress function of the blosc/blosclz.c file in Blosc C-Blosc2 versions 3.3.0 through 3.3.2. This flaw could be triggered remotely, though exploitation complexity is high and difficult. The vulnerability is fixed in version 3.3.3 by patch fe2964d114d97847f56570a0ab2be2c57ccbeedc.
Potential Impact
Successful exploitation of this vulnerability could lead to an integer overflow during decompression operations, potentially causing memory corruption or denial of service. However, the attack complexity is high and exploitability is difficult, reducing the likelihood of widespread exploitation. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade the affected Blosc C-Blosc2 component to version 3.3.3, which contains the official fix for this integer overflow vulnerability. No additional mitigations are specified or required.
CVE-2026-103222: Integer Overflow in Blosc C-Blosc2
Description
CVE-2026-103222 is an integer overflow vulnerability in the Blosc C-Blosc2 library affecting versions 3.3.0, 3.3.1, and 3.3.2. The flaw exists in the blosclz_decompress function within the blosc/blosclz.c component. Exploitation requires high complexity and is considered difficult, but it can be triggered remotely. The issue is resolved by upgrading to version 3.3.3.
CVSS v4.0
Score 6.3medium
Affected software
Blosc
C-Blosc2
pkg:github/blosc/c-blosc2cpe:2.3:a:blosc:c-blosc2:*:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An integer overflow vulnerability was identified in the blosclz_decompress function of the blosc/blosclz.c file in Blosc C-Blosc2 versions 3.3.0 through 3.3.2. This flaw could be triggered remotely, though exploitation complexity is high and difficult. The vulnerability is fixed in version 3.3.3 by patch fe2964d114d97847f56570a0ab2be2c57ccbeedc.
Potential Impact
Successful exploitation of this vulnerability could lead to an integer overflow during decompression operations, potentially causing memory corruption or denial of service. However, the attack complexity is high and exploitability is difficult, reducing the likelihood of widespread exploitation. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade the affected Blosc C-Blosc2 component to version 3.3.3, which contains the official fix for this integer overflow vulnerability. No additional mitigations are specified or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-30T07:25:13.598Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abd1a472a4e24523d1a5fb8
Added to database: 09/30/2026, 14:18:47 UTC
Last enriched: 09/30/2026, 14:33:30 UTC
Last updated: 09/30/2026, 14:48:15 UTC
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.