Out-of-bounds Read in Turboderp-Org Exllamav3
CVE-2026-124994
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: 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.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Turboderp-Org Exllamav3 — versions 1.6.0, 1.6.1, 1.6.2
Weakness classification (CWE)
References
- VDB-433165 | Turboderp-org ExLlamaV3 NGramEmbedding ngram.cu ngram_dequant out-of-bounds (vdb-entry, technical-description)
- VDB-433165 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- CVE-2026-124994 | CVE Analysis and Report (third-party-advisory)
- Submit #1040626 | turboderp-org exllamav3 commit 6ff3a17ea7f3 (version 1.4.8) Out-of-bounds Read (third-party-advisory)
- github.com/turboderp-org/exllamav3/issues/525 (issue-tracking)
- github.com/user-attachments/files/33598849/poc.zip (exploit)
- github.com/turboderp-org/exllamav3/commit/c9a57ae832a3035e264e0a412e1daf4ebb699… (patch)
- github.com/turboderp-org/exllamav3/releases/tag/v1.6.4 (patch)
- github.com/turboderp-org/exllamav3/ (product)
Frequently asked questions
- What is CVE-2026-124994?
- CVE-2026-124994 is a medium-severity vulnerability in Turboderp-Org Exllamav3, classified under Out-of-bounds Read. CVSS score: 6.3/10. Published 2026-11-09.
- How severe is CVE-2026-124994?
- Medium severity. CVSS v3 base score is 6.3 out of 10.