CVE-2026-116840

llama.cpp b5854 before b11275 Integer Overflow in gguf_init_from_reader

Published Oct 27, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Description

llama.cpp b5854 before b11275 contains an integer overflow vulnerability in gguf_init_from_reader that bypasses the CVE-2025-53630 size check when padding near-SIZE_MAX tensor sizes. Attackers can supply a crafted GGUF file whose tensor size pads to zero, causing an undersized data blob and out-of-bounds reads by consumers.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

ggml-org

llama.cpp

unaffected

Version	Status	Constraints
`b5854`	affected	< b11275
`0.1.0`	affected	< 0.6.0

No data.

Vendor Product Versions

Ggml

Llama.cpp

Version	Status	Scheme	Platform
`[b5854,b11275)`	affected	generic	—
`[0.1.0,0.6.0)`	affected	semver	—

Ggml-org

Llama.cpp

Version	Status	Scheme	Platform
`[b5854,b11275)`	affected	generic	—
`[0.1.0,0.6.0)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.126% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://github.com/ggml-org/llama.cpp/blob/v0.5.0/ggml/src/gguf.cpp#L794-L795
https://github.com/ggml-org/llama.cpp/commit/a6ea155d3d38b3f6f43d0c0dc29c2d592413ef44
https://github.com/ggml-org/llama.cpp/issues/26978
https://github.com/ggml-org/llama.cpp/pull/26979
https://github.com/ggml-org/llama.cpp/releases/tag/b11275
https://www.vulncheck.com/advisories/llama-cpp-b5854-before-b11275-integer-overflow-in-gguf-init-from-reader

History

Oct 27, 2026 3:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 27, 2026 8:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Ggml-org Ggml-org llama.cpp
Vendors & Products		Ggml-org Ggml-org llama.cpp

Oct 27, 2026 4:30 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		llama.cpp b5854 before b11275 contains an integer overflow vulnerability in gguf_init_from_reader that bypasses the CVE-2025-53630 size check when padding near-SIZE_MAX tensor sizes. Attackers can supply a crafted GGUF file whose tensor size pads to zero, causing an undersized data blob and out-of-bounds reads by consumers.
Title		llama.cpp b5854 before b11275 Integer Overflow in gguf_init_from_reader
First Time appeared		Ggml Ggml llama.cpp
Weaknesses		CWE-190
CPEs		cpe:2.3:a:ggml:llama.cpp::::::::
Vendors & Products		Ggml Ggml llama.cpp
References		https://github.com/ggml-org/llama.cpp/blob/v0.5.0/ggml/src/gguf.cpp#L794-L795 https://github.com/ggml-org/llama.cpp/commit/a6ea155d3d38b3f6f43d0c0dc29c2d592413ef44 https://github.com/ggml-org/llama.cpp/issues/26978 https://github.com/ggml-org/llama.cpp/pull/26979 https://github.com/ggml-org/llama.cpp/releases/tag/b11275 https://www.vulncheck.com/advisories/llama-cpp-b5854-before-b11275-integer-overflow-in-gguf-init-from-reader
Metrics		cvssV3_1 `{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'}` cvssV4_0 `{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}`