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TI-2026-76373 Aliases CVE-2026-112107GHSA-4xjv-j4pr-6vxm

Buffer overflow in ztxz16 fastllm Safetensors weight loading

Priority MEDIUM 57CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

ztxz16 fastllm up to 1.8.2 is affected. In the SafeTensorItem::CreateBuffer function, manipulating the data_offsets argument causes a buffer overflow (CWE-120). The attack can be initiated remotely without privileges, and a public exploit has been published.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

A flaw has been found in ztxz16 fastllm up to 1.8.2. Affected by this issue is the function SafeTensorItem::CreateBuffer of the file src/model.cpp of the component Safetensors Weight Loading. This manipulation of the argument data_offsets causes buffer overflow. The attack can be initiated remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00267 18th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ztxz16fastllm1.8.0; 1.8.1; 1.8.2—No fix listedCNA
  • fastllm Vendorztxz16 Affected 1.8.0; 1.8.1; 1.8.2 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:ztxz16:fastllm:*:*:*:*:*:*:*:*——ztxz16
  • cpe:2.3:a:ztxz16:fastllm:*:*:*:*:*:*:*:* Versions — — ·ztxz16

Remediation

The sources list no fixed version for fastllm.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-19 Threatist record created from CVE-2026-112107
  2. 2026-10-19 Alias added: GHSA-4xjv-j4pr-6vxm
  3. 2026-10-19 CISA SSVC decision points changed
  4. 2026-10-19 Priority changed: LOW → MEDIUM

References

Exploit 1

Other 2

  • TI-2026-76381 Buffer overflow in ztxz16 fastllm GGUF string parsing CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences