Vulnerability-Lookup

OESA-2026-3166 (CVE-2026-61714)

Vulnerability from osv_openeuler – Published: 2026-07-24 11:12 – Updated: 2026-08-06 11:12 – Source website

Summary

fluidsynth security update

Details

FluidSynth is a free software synthesizer. Its currently based on the SoundFont 2 specifications and supports real time MIDI effect controls. It can be used as a shared library for embedding in other applications, can play MIDI files and has a command line shell. Many other applications use FluidSynth for audio synthesis.

Security Fix(es):

A heap-based buffer overflow was discovered in fluidsynth's MIDI player. When the synth is configured with synth.midi-channels > 16 an out-of-bounds memory access is performed on the array _fluid_player_t::channel_isplaying in heap memory invoking undefined behavior. No crafted MIDI file is required to expose this vulnerability.(CVE-2026-61714)

Severity

7.8 (High)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-61714	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "fluidsynth-2.3.4-3.oe2403sp3.aarch64.rpm",
          "fluidsynth-debuginfo-2.3.4-3.oe2403sp3.aarch64.rpm",
          "fluidsynth-debugsource-2.3.4-3.oe2403sp3.aarch64.rpm",
          "fluidsynth-devel-2.3.4-3.oe2403sp3.aarch64.rpm",
          "fluidsynth-help-2.3.4-3.oe2403sp3.aarch64.rpm"
        ],
        "src": [
          "fluidsynth-2.3.4-3.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "fluidsynth-2.3.4-3.oe2403sp3.x86_64.rpm",
          "fluidsynth-debuginfo-2.3.4-3.oe2403sp3.x86_64.rpm",
          "fluidsynth-debugsource-2.3.4-3.oe2403sp3.x86_64.rpm",
          "fluidsynth-devel-2.3.4-3.oe2403sp3.x86_64.rpm",
          "fluidsynth-help-2.3.4-3.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "fluidsynth",
        "purl": "pkg:rpm/openEuler/fluidsynth\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.4-3.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "FluidSynth is a free software synthesizer. Its currently based on the SoundFont 2 specifications and supports real time MIDI effect controls. It can be used as a shared library for embedding in other applications, can play MIDI files and has a command line shell. Many other applications use FluidSynth for audio synthesis.\r\n\r\nSecurity Fix(es):\n\nA heap-based buffer overflow was discovered in fluidsynth\u0026apos;s MIDI player. When the synth is configured with `synth.midi-channels \u0026gt; 16` an out-of-bounds memory access is performed on the array `_fluid_player_t::channel_isplaying` in heap memory invoking undefined behavior. No crafted MIDI file is required to expose this vulnerability.(CVE-2026-61714)",
  "id": "OESA-2026-3166",
  "modified": "2026-08-06T11:12:02Z",
  "published": "2026-07-24T11:12:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3166"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61714"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "fluidsynth security update",
  "upstream": [
    "CVE-2026-61714"
  ]
}

CVE-2026-61714 (GCVE-0-2026-61714)

Vulnerability from cvelistv5 – Published: 2026-09-18 20:01 – Updated: 2026-09-18 20:01

Title

FluidSynth: Heap Buffer Overflow in MIDI Player

Summary

FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6, configuring synth.midi-channels above 16 allows the MIDI player to index _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels. The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality, integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the vulnerable path. This issue is fixed in version 2.5.6.

Severity

7.8 (High)


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

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-125 - Out-of-bounds Read
CWE-787 - Out-of-bounds Write

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/FluidSynth/fluidsynth/security…	x_refsource_CONFIRM
https://github.com/FluidSynth/fluidsynth/commit/7…	x_refsource_MISC
https://github.com/FluidSynth/fluidsynth/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FluidSynth	fluidsynth	Affected: >= 2.2.4, < 2.5.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "fluidsynth",
          "vendor": "FluidSynth",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.2.4, \u003c 2.5.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.2.4 until 2.5.6, configuring synth.midi-channels above 16 allows the MIDI player to index _fluid_player_t::channel_isplaying outside its fixed-size heap allocation while tracking active channels. The resulting out-of-bounds reads and writes invoke undefined behavior and may compromise confidentiality, integrity, or availability. No crafted MIDI file is required because the unsafe condition is created by the channel-count configuration itself. Keeping synth.midi-channels at its default value of 16 avoids the vulnerable path. This issue is fixed in version 2.5.6."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "CWE-122: Heap-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787: Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T20:01:14.342Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-976m-35rw-h3m6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-976m-35rw-h3m6"
        },
        {
          "name": "https://github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e2269211effc",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/FluidSynth/fluidsynth/commit/772702e00cc6acc7c607efb40283e2269211effc"
        },
        {
          "name": "https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/FluidSynth/fluidsynth/releases/tag/v2.5.6"
        }
      ],
      "source": {
        "advisory": "GHSA-976m-35rw-h3m6",
        "discovery": "UNKNOWN"
      },
      "title": "FluidSynth: Heap Buffer Overflow in MIDI Player"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61714",
    "datePublished": "2026-09-18T20:01:14.342Z",
    "dateReserved": "2026-07-10T18:51:13.920Z",
    "dateUpdated": "2026-09-18T20:01:14.342Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "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.

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.
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OESA-2026-3166 (CVE-2026-61714)

CVE-2026-61714 (GCVE-0-2026-61714)

Tags

Sightings

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