CVE-2025-9809Public exploit

Code execution via oversized CUE file path

Published Sep 1, 2025 · Updated Sep 1, 2025

Out-of-bounds write in Libretro libretro-common allows remote attackers to execute arbitrary code through a crafted .cue file. Within cdfs_open_cue_track, memcpy uses the untrusted file-path length as its copy size even when that length exceeds the fixed PATH_MAX_LENGTH destination buffer. Exploitation requires a vulnerable consumer to process the attacker-supplied CUE file; the CNA assessment treats delivery as local and requires active user interaction.

CVSS severity8.4
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Libretro libretro-common allows remote attackers to execute arbitrary code through a crafted .cue file. Within cdfs_open_cue_track, memcpy uses the untrusted file-path length as its copy size even when that length exceeds the fixed PATH_MAX_LENGTH destination buffer. Exploitation requires a vulnerable consumer to process the attacker-supplied CUE file; the CNA assessment treats delivery as local and requires active user interaction.

The record

CVE
CVE-2025-9809
Published
Sep 1, 2025
Updated
Sep 1, 2025
Vendor
Libretro
Product
libretro-common
Classifications
CWE-787, CAPEC-100, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Libretro · libretro-commonversion=0

Published CVSS scores

8.4CyberArk LabsCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CAPEC-100Overflow Buffers
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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