CVE-2026-33298

CVE-2026-33298 is a high-severity vulnerability in Ggml Llama.cpp with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

• Severity: High (CVSS 3.x base score 7.8)
• EPSS exploit prediction: 0% (38th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2026-14668
• Weakness: CWE-122
• Affected product: Ggml Llama.cpp
• Published: 2026-03-24
• Last modified: 2026-06-17

Description

llama.cpp is an inference of several LLM models in C/C++. Prior to b7824, an integer overflow vulnerability in the `ggml_nbytes` function allows an attacker to bypass memory validation by crafting a GGUF file with specific tensor dimensions. This causes `ggml_nbytes` to return a significantly smaller size than required (e.g., 4MB instead of Exabytes), leading to a heap-based buffer overflow when the application subsequently processes the tensor. This vulnerability allows potential Remote Code Execution (RCE) via memory corruption. b7824 contains a fix.

Frequently asked questions

What is CVE-2026-33298?

llama.cpp is an inference of several LLM models in C/C++. Prior to b7824, an integer overflow vulnerability in the `ggml_nbytes` function allows an attacker to bypass memory validation by crafting a GGUF file with specific tensor dimensions. This causes `ggml_nbytes` to return a significantly smaller size than required (e.g., 4MB instead of Exabytes), leading to a heap-based buffer overflow when the application subsequently processes the tensor. This vulnerability allows potential Remote Code Execution (RCE) via memory corruption. b7824 contains a fix.

How severe is CVE-2026-33298?

CVE-2026-33298 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33298 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33298?

CVE-2026-33298 affects Ggml Llama.cpp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33298?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33298 have an EU (EUVD) identifier?

Yes. CVE-2026-33298 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14668.

When was CVE-2026-33298 published?

CVE-2026-33298 was published on 2026-03-24 and last updated on 2026-06-17.

References

• https://github.com/ggml-org/llama.cpp/releases/tag/b7824
• https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-96jg-mvhq-q7q7

Affected products (1)

• cpe:2.3:a:ggml:llama.cpp:*:*:*:*:*:*:*:*

More vulnerabilities in Ggml Llama.cpp

• CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
• CVE-2026-34159 — Critical (CVSS 9.8): llama.cpp is an inference of several LLM models in C/C++. Prior to version b8492, the RPC backend's…
• CVE-2026-21869 — High (CVSS 8.8): llama.cpp is an inference of several LLM models in C/C++. In commits 55d4206c8 and prior, the n_discard parameter is…
• CVE-2025-49847 — High (CVSS 8.8): llama.cpp is an inference of several LLM models in C/C++. Prior to version b5662, an attacker‐supplied GGUF model…
• CVE-2024-23605 — High (CVSS 8.8): A heap-based buffer overflow vulnerability exists in the GGUF library header.n_kv functionality of llama.cpp Commit…
• CVE-2024-23496 — High (CVSS 8.8): A heap-based buffer overflow vulnerability exists in the GGUF library gguf_fread_str functionality of llama.cpp Commit…

All CVEs affecting Ggml Llama.cpp →

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities

• CVE-2026-46752 — Critical (CVSS 10.0): Redis Lua HEAP overflow in cjson library vulnerability in Apache Kvrocks. This issue affects Apache Kvrocks: from…
• CVE-2026-24822 — Critical (CVSS 10.0): Out-of-bounds Write, Heap-based Buffer Overflow vulnerability in ttttupup wxhelper (src modules). This vulnerability is…
• CVE-2025-23123 — Critical (CVSS 10.0): A malicious actor with access to the management network could execute a remote code execution (RCE) by exploiting a…
• CVE-2022-34819 — Critical (CVSS 10.0): A vulnerability has been identified in SIMATIC CP 1242-7 V2 (All versions < V3.3.46), SIMATIC CP 1243-1 (All versions <…
• CVE-2026-44050 — Critical (CVSS 9.9): A heap-based buffer overflow in the CNID daemon comm_rcv() function in Netatalk 2.0.0 through 4.4.2 allows a remote…
• CVE-2026-49841 — Critical (CVSS 9.8): FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to…

Browse all CWE-122 (Heap-based Buffer Overflow) vulnerabilities →