CVE-2026-6676— Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive
Possible ATT&CK Techniques 1AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Gen Digital | Avira Antivirus | < 8.3.27.12 | affected |
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I. Basic Information for CVE-2026-6676
Vulnerability Information
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Vulnerability Title
Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive
Source: NVD (National Vulnerability Database)
Vulnerability Description
Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process. This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
Source: NVD (National Vulnerability Database)
Vulnerability Title
Gen Digital Avira Antivirus 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gen Digital Avira Antivirus是美国Gen Digital公司的一款防病毒与网络安全软件。 Gen Digital Avira Antivirus 8.3.27.12之前版本存在缓冲区错误漏洞，该漏洞源于扫描异常POSIX tar归档文件时存在堆缓冲区越界写入，可能导致本地执行代码或拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Gen Digital | Avira Antivirus | 0 ~ 8.3.27.12 | - |
II. Public POCs for CVE-2026-6676
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Same Patch Batch · Gen Digital · 2026-06-12 · 17 CVEs total
| CVE-2025-7003 | 7.8 HIGH | Avira antivirus engine heap buffer OOB read when scanning a malformed PDF file (variant 1) |
| CVE-2025-7002 | 7.8 HIGH | Avira antivirus engine heap buffer OOB read when scanning a malformed PDF file (variant 2) |
| CVE-2025-7008 | 7.8 HIGH | Avast antivirus heap buffer OOB read when scanning a malformed PE file |
| CVE-2025-7009 | 7.8 HIGH | Avast antivirus heap buffer OOB read when scanning a malformed PE file |
| CVE-2025-7017 | 7.8 HIGH | Avira antivirus engine heap buffer OOB read when scanning a malformed Windows MSI file |
| CVE-2025-7004 | 7.8 HIGH | Avast antivirus heap buffer OOB write when scanning a malformed PE file |
| CVE-2025-7011 | 7.8 HIGH | Avast antivirus heap OOB when scanning a malformed zip file |
| CVE-2025-9032 | 7.8 HIGH | Avira antivirus engine heap buffer OOB read when scanning a malformed PE file |
| CVE-2025-9033 | 7.8 HIGH | Avira antivirus engine heap buffer OOB read when scanning a malformed PDF file (variant 3) |
| CVE-2025-14098 | 7.8 HIGH | Avira antivirus engine heap buffer OOB write when scanning a malformed MS-DOS executable f |
| CVE-2026-12068 | 7.4 HIGH | Avira Password Manager credential disclosure via cross-origin autofill in Firefox |
| CVE-2025-7006 | 5.5 MEDIUM | Avast antivirus use of stack memory after free when scanning a malformed PE file |
| CVE-2025-7010 | 5.5 MEDIUM | Avast antivirus stack overflow when scanning a malformed PDF file |
| CVE-2025-7005 | 5.5 MEDIUM | Avast antivirus infinite recursion when scanning a malformed PE file |
| CVE-2025-7018 | 5.5 MEDIUM | Avira antivirus engine null pointer dereference when scanning a malformed PE file |
| CVE-2025-7019 | 5.5 MEDIUM | Avast antivirus stack overflow when scanning a malformed Office Open XML file |
IV. Related Vulnerabilities
Same product: Avira Antivirus
- CVE-2025-14098
Avira antivirus engine heap buffer OOB write when scanning a - CVE-2025-9033
Avira antivirus engine heap buffer OOB read when scanning a - CVE-2025-9032
Avira antivirus engine heap buffer OOB read when scanning a - CVE-2025-7018
Avira antivirus engine null pointer dereference when scannin - CVE-2025-7017
Avira antivirus engine heap buffer OOB read when scanning a
Same vendor: Gen Digital
- CVE-2026-12068
Avira Password Manager credential disclosure via cross-origi - CVE-2025-14098
Avira antivirus engine heap buffer OOB write when scanning a - CVE-2025-9033
Avira antivirus engine heap buffer OOB read when scanning a - CVE-2025-9032
Avira antivirus engine heap buffer OOB read when scanning a - CVE-2025-7019
Avast antivirus stack overflow when scanning a malformed Off
Same weakness: CWE-787
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Heap out-of-bounds write via odd slice_height in FFmpeg Magi - CVE-2026-2674
Out-of-bounds Write vulnerability in RTI Connext Professiona - CVE-2026-12528
389-ds-base: 389-ds-base: heap-buffer-overflows in __aclp__n - CVE-2026-10641
Out-of-bounds write in Bluetooth HFP Hands-Free CIND indicat - CVE-2026-39199
snes9x 1.63文件处理越界写入及拒绝服务漏洞
V. Comments for CVE-2026-6676
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