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EPSS 0.1%top 98%

Improper input validation in libcodec2_sec_flacdec.so prior to SMR Aug-2026 Release 1 allows local attackers to write out-of-bounds memory. (CVE-2026-21066)

0
Medium
Published: 08/10/2026 (08/10/2026, 09:31:23 UTC)
Source: GCVE Database

Description

CVE-2026-21066 is a vulnerability in libcodec2_sec_flacdec.so prior to SMR Aug-2026 Release 1 that allows local attackers to perform out-of-bounds memory writes due to improper input validation. This issue could lead to memory corruption if exploited. The vulnerability has a medium severity rating and no known exploits in the wild. No patch information is currently available.

CVSS v4.0

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
Low
Vuln. Integrity
Low
Vuln. Availability
Low
Subsq. Confidentiality
Low
Subsq. Integrity
Low
Subsq. Availability
Low
Scope
X
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/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

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/10/2026, 16:00:37 UTC

Technical Analysis

This vulnerability involves improper input validation in the libcodec2_sec_flacdec.so component before SMR Aug-2026 Release 1. Local attackers can exploit this flaw to write outside the bounds of allocated memory, potentially causing memory corruption. The CVSS 4.0 vector indicates local attack vector with low complexity and no privileges required, but the overall impact and exploitability metrics are marked as unknown or not specified. No vendor advisory or patch information is provided, and no known active exploitation has been reported.

Potential Impact

Successful exploitation allows a local attacker to write out-of-bounds memory, which can lead to memory corruption. The exact consequences of this corruption (such as privilege escalation or denial of service) are not detailed in the provided information. There are no known exploits in the wild at this time.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, limit local access to trusted users to reduce risk.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-qr93-xw8j-6gx7
Osv Schema Version
1.4.0
Aliases
["CVE-2026-21066"]
Ecosystems
[]
Database Specific Severity
MODERATE
Cvss Version
4.0

Threat ID: 6a79f0dfbf8831d539f61f86

Added to database: 08/10/2026, 15:40:15 UTC

Last enriched: 08/10/2026, 16:00:37 UTC

Last updated: 08/11/2026, 03:40:59 UTC

Views: 2

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