CVE-2026-116502 Details
Description
A flaw has been found in turboderp-org ExLlamaV2 up to 0.3.2. The impacted element is the function QMatrix::make_sequential of the file exllamav2/exllamav2_ext/cuda/q_matrix.cu of the component GPTQ Index Handler. Executing a manipulation of the argument g_idx can lead to out-of-bounds write. The attack needs to be launched locally. The project was informed of the problem early through an issue report but has not responded yet.
A vulnerability allowing out-of-bounds write has been identified in turboderp ExLlamaV2 versions through 0.3.2. The issue arises in the QMatrix GPTQ Index Handler, specifically within the make_sequential function of the file exllamav2/exllamav2_ext/cuda/q_matrix.cu. The vulnerability can be exploited locally by manipulating the g_idx argument, leading to unauthorized memory writes. This flaw was reported to the project, but no response has been received yet.
It is recommended to validate all model-supplied quantization metadata in the QMatrix constructor or make_sequential function. This includes checking that every g_idx value is within the valid range, ensuring q_group_map indices are correct, verifying that bits are not zero, and maintaining consistency between q_groups row counts and weight buffer sizes.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 26, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/turboderp-org/exllamav2/ | [email protected] | ProductVendor |
| https://github.com/turboderp-org/exllamav2/issues/817 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://vuldb.com/cve/CVE-2026-116502 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1022425 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/426401 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/426401/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| turboderp-org ExLlamaV2 | <= 0.3.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Oct 26, 2026 | New CVE Received | [email protected] |