Vulnerability-Lookup

GHSA-FPVP-JGX3-4W9Q

Vulnerability from github – Published: 2026-08-21 18:34 – Updated: 2026-08-21 18:34

Details

llama.cpp before b8585 contains a use-after-free vulnerability in the RPC server's GRAPH_RECOMPUTE handler that allows unauthenticated remote attackers to achieve arbitrary read and write access by storing a computation graph, freeing referenced buffers, and reclaiming freed memory with attacker-controlled content. Attackers can send RPC requests to trigger re-execution of stored graphs with dangling pointers, enabling full remote code execution without requiring authentication or user interaction.

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

9.2 (Critical)


                  
                    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-39909"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-21T17:16:30Z",
    "severity": "CRITICAL"
  },
  "details": "llama.cpp before b8585 contains a use-after-free vulnerability in the RPC server\u0027s GRAPH_RECOMPUTE handler that allows unauthenticated remote attackers to achieve arbitrary read and write access by storing a computation graph, freeing referenced buffers, and reclaiming freed memory with attacker-controlled content. Attackers can send RPC requests to trigger re-execution of stored graphs with dangling pointers, enabling full remote code execution without requiring authentication or user interaction.",
  "id": "GHSA-fpvp-jgx3-4w9q",
  "modified": "2026-08-21T18:34:58Z",
  "published": "2026-08-21T18:34:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39909"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ggml-org/llama.cpp/pull/21175"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ggml-org/llama.cpp/commit/389c7d4955ba55c7418afaebf7c23d9ed64ef707"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ggml-org/llama.cpp/releases/tag/b8585"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/llama-cpp-use-after-free-in-rpc-graph-recompute-handler"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-39909 (GCVE-0-2026-39909)

Vulnerability from cvelistv5 – Published: 2026-08-21 16:28 – Updated: 2026-08-21 21:43

Title

llama.cpp Use-After-Free in RPC GRAPH_RECOMPUTE Handler

Summary

Severity

9.2 (Critical)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 21:20 UTC

CWE

CWE-416 - Use After Free

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/ggml-org/llama.cpp/releases/ta…	release-notes
https://github.com/ggml-org/llama.cpp/pull/21175	issue-tracking
https://github.com/ggml-org/llama.cpp/commit/389c…	patch
https://www.vulncheck.com/advisories/llama-cpp-us…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
ggml-org	llama.cpp	Affected: 0 , < b8585 (custom)

Date Public

2026-03-30 00:00

Credits

Olivier Laflamme

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39909",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-21T21:20:35.912727Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-08-21T21:43:56.000Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/ggml-org/llama.cpp",
          "product": "llama.cpp",
          "repo": "https://github.com/ggml-org/llama.cpp",
          "vendor": "ggml-org",
          "versions": [
            {
              "lessThan": "b8585",
              "status": "affected",
              "version": "0",
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      "credits": [
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          "type": "finder",
          "value": "Olivier Laflamme"
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      "descriptions": [
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          "lang": "en",
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        }
      ],
      "metrics": [
        {
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            "Recovery": "NOT_DEFINED",
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            "baseScore": 9.2,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
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            "providerUrgency": "NOT_DEFINED",
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            "subConfidentialityImpact": "NONE",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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          "name": "Release Notes",
          "tags": [
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        },
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          "url": "https://github.com/ggml-org/llama.cpp/pull/21175"
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        },
        {
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          "url": "https://www.vulncheck.com/advisories/llama-cpp-use-after-free-in-rpc-graph-recompute-handler"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
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    "datePublished": "2026-08-21T16:28:26.774Z",
    "dateReserved": "2026-04-07T20:57:06.209Z",
    "dateUpdated": "2026-08-21T21:43:56.000Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-FPVP-JGX3-4W9Q

CVE-2026-39909 (GCVE-0-2026-39909)

Tags

Sightings

Nomenclature