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CVE-2026-64834— FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer

Quick assessment

Affected
FFmpeg FFmpeg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 0.6.3版本及之前版本和8.1.2及之前版本存在资源管理错误漏洞，该漏洞源于libavformat/rtpdec_asf.c中的RTP/ASF demuxer存在无限循环，rtp_asf_fix_header函数未能验证最小块大小，当块大小小于24字节时导致循环指针无法推进，从而造成CPU耗尽，导致拒绝服务。

CVSS 7.5 · High EPSS 0.73% · P53

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg 0.6.3≤ 8.1.2 affected
11d5f475be95d22d5f0692220cc772b116abc632 affected
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I. Basic Information for CVE-2026-64834

Vulnerability Information
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Vulnerability Title
FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions 0.6.3 through 8.1.2 contain an infinite loop vulnerability in the RTP/ASF demuxer within libavformat/rtpdec_asf.c that allows remote attackers to cause denial of service by sending a crafted RTP/ASF stream. The rtp_asf_fix_header function fails to validate a minimum chunksize when iterating over ASF objects, causing the loop pointer to never advance when a chunksize is smaller than the 24-byte minimum ASF object header size, resulting in CPU exhaustion that denies service to legitimate users.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 0.6.3版本及之前版本和8.1.2及之前版本存在资源管理错误漏洞，该漏洞源于libavformat/rtpdec_asf.c中的RTP/ASF demuxer存在无限循环，rtp_asf_fix_header函数未能验证最小块大小，当块大小小于24字节时导致循环指针无法推进，从而造成CPU耗尽，导致拒绝服务。
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
FFmpeg FFmpeg 0.6.3 ~ 8.1.2 -

II. Public POCs for CVE-2026-64834

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III. Intelligence Information for CVE-2026-64834

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Patches & Fixes for CVE-2026-64834 (2)

Vendor Advisories for CVE-2026-64834 (1)

Same Patch Batch · FFmpeg · 2026-07-22 · 6 CVEs total

CVE-2026-64831 8.8 HIGH FFmpeg 8.0 - 8.1.2 Stack Buffer Overflow in Vulkan HEVC Decoder
CVE-2026-64830 8.8 HIGH FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer
CVE-2026-64832 8.8 HIGH FFmpeg 4.4 - 8.1.2 Double-Free in NVDEC Hardware Decoder via nvdec.c
CVE-2026-64835 8.8 HIGH FFmpeg 4.4 - 8.1.2 Out-of-Bounds Memory Access in ADX Audio Decoder
CVE-2026-64833 7.1 HIGH FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-835

V. Comments for CVE-2026-64834

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