# CVE-2026-124994: Turboderp-org ExLlamaV3 NGramEmbedding ngram.cu ngram_dequant out-of-bounds

Status: published. Published: 2026-11-09. Updated: 2026-11-09.

A security flaw has been discovered in Turboderp-org ExLlamaV3 up to 1.6.3. The affected element is the function ngram_dequant of the file exllamav3/exllamav3_ext/ngram.cu of the component NGramEmbedding. The manipulation of the argument head_bias results in out-of-bounds read. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 1.6.4 is sufficient to fix this issue. The patch is identified as c9a57ae832a3035e264e0a412e1daf4ebb699b98. It is suggested to upgrade the affected component.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulDB) — https://github.com/turboderp-org/exllamav3/commit/c9a57ae832a3035e264e0a412e1daf4ebb699b98
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulDB) — https://github.com/turboderp-org/exllamav3/releases/tag/v1.6.4

## Affected products and versions

- Turboderp-org / ExLlamaV3: 1.6.0 (affected); 1.6.1 (affected); 1.6.2 (affected); 1.6.3 (affected); 1.6.4 (unaffected). Source: CNA: VulDB

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P; source: CNA: VulDB

- CVSS 3.1: 6.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C; source: CNA: VulDB

- CVSS 3.0: 6.3 (medium); CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C; source: CNA: VulDB

- CVSS 2.0: 7.5 (high); AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C; source: CNA: VulDB

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-125, CWE-119

## Exploit evidence

- exploit: https://github.com/user-attachments/files/33598849/poc.zip (CNA: VulDB)

## References

- https://vuldb.com/vuln/433165 (CNA: VulDB; vdb-entry, technical-description)

- https://vuldb.com/vuln/433165/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-124994 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/1040626 (CNA: VulDB; third-party-advisory)

- https://github.com/turboderp-org/exllamav3/issues/525 (CNA: VulDB; issue-tracking)

- https://github.com/user-attachments/files/33598849/poc.zip (CNA: VulDB; exploit)

- https://github.com/turboderp-org/exllamav3/commit/c9a57ae832a3035e264e0a412e1daf4ebb699b98 (CNA: VulDB; patch)

- https://github.com/turboderp-org/exllamav3/releases/tag/v1.6.4 (CNA: VulDB; patch)

- https://github.com/turboderp-org/exllamav3/ (CNA: VulDB; product)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-124994; retrieved 2026-11-09; source updated 2026-11-09

Revision: 94b3ce688579604b729aae4f0c7b412e2d93e6a1ca99049134a503958459ad43

Canonical: https://y2.dev/cve/CVE-2026-124994

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