CVE-2026-64833: ffmpeg Out-of-bounds Read
CVSS: 7.1v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-64833DEBIAN-CVE-2026-64833CGA-2xqf-jp9j-x44jCGA-59pq-hmc7-whq2CGA-5mhr-3pf4-w642CGA-fj99-p9rq-w68qCGA-qjw6-j5wv-q6jcCGA-qppr-h4v5-h2j2CGA-w28f-r7f2-jh5fCGA-x3h2-6gpw-fxvmCGA-2j4x-9f4x-m2r8CGA-3547-rc4x-2pmfCGA-4336-vp6p-r88pCGA-47mh-8537-m9rpCGA-4m5v-cj5c-m425CGA-54wf-rq84-xc33CGA-5w4m-wf3r-5j46CGA-74jw-f96w-xv5hCGA-882m-xr39-2632CGA-8fp6-6rfh-8w83CGA-8qpm-6rpg-833rCGA-c7x4-xr96-3qxjCGA-g9gg-rxj9-f7xmCGA-gh9p-px3w-vqqmCGA-gxv6-xpjj-f3hwCGA-h55r-r7ww-mgrjCGA-h588-h253-x6g7CGA-hqr7-8fp2-8h39CGA-jgfh-hvrq-vh72CGA-mv3x-g7gg-gwmxCGA-pg5w-2hj8-4r89CGA-pr7m-rjvf-f3hwCGA-qwcx-24gx-5jgcCGA-r285-c73p-fqfwCGA-r79r-fvfp-gc2vCGA-rpcv-p8c9-r3mgCGA-v579-j2x4-rfmqCGA-w3xx-4mc9-hmqr
Published 22-07-2026Last modified 12-08-2026
Vulnerability summary
CVE-2026-64833 is a high (CVSS 7.1) Out-of-bounds Read vulnerability in ffmpeg. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.2% of scored vulnerabilities.
CVSS score
7.1/10
010
High · v4.0 (CVE.org)EPSS score
0.40%
0%100%
Low · +0.18 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 11 · Related 10Timeline
- 22-07-2026PublishedVulnerability first disclosed.
- 12-08-2026Last modifiedVulnerability information updated.
Description
FFmpeg versions 0.7.1 through 8.1.2 contain an out-of-bounds read vulnerability in the S/PDIF muxer that allows attackers to access memory beyond buffer boundaries by supplying a crafted DTS stream with a core_size value larger than the actual packet length. Attackers can exploit the missing bounds check in the spdif_header_dts4 function by providing a malicious DTS-HD audio stream during S/PDIF re-muxing to trigger unauthorized memory reads beyond the packet buffer.
CVSS metrics
9 scores · 6 sources · 2 versionsHigh 7.1Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:NSourcesAll 6 agree
- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/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
- OSV · WolfiEcosystem advisory · calculated7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
- NVDNIST7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/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
High 7.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
- NVDNIST7.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
EPSS trend
Probability
0.40%
Chance of exploitation in the next 30 days
Percentile
32%
Versus all other CVEs
30-day change
+0.18 pp
From 0.21% on 18-09-2026
18-09-202618-10-2026
EPSS score0.40%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard18 products
- eco-python-ffmpeg-6-minimalAll versions (No fix recorded)
- eco-python-ffmpeg-6-minimal-devAll versions (No fix recorded)
- eco-python-ffmpeg-6-minimal-staticAll versions (No fix recorded)
- eco-python-ffmpeg-7-minimalAll versions (No fix recorded)
- eco-python-ffmpeg-7-minimal-devAll versions (No fix recorded)
Wolfi4 products
- ffmpeg-7All versions (No fix recorded)
- ffmpeg-7.1All versions (No fix recorded)
- ffmpeg-8.0All versions (No fix recorded)
- ffmpeg-8.1< 8.1.3-r0
Ubuntu2 products
- ffmpeg< 7:2.8.17-0ubuntu0.1+esm17 | < 7:3.4.11-0ubuntu0.1+esm15 | < 7:4.2.7-0ubuntu0.1+esm16 | < 7:4.4.2-0ubuntu0.22.04.1+esm15 | < 7:6.1.1-3ubuntu5+esm13 | All versions (No fix recorded) | < 7:8.0.1-3ubuntu2+esm4
- libavAll versions (No fix recorded)
Debian1 product
- ffmpegAll versions (No fix recorded) | < 7:9.0.2-1
Ffmpeg1 product
- ffmpeg6f80e2765492700622596af720534cef33dd31b4 | ≥ 0.7.1, ≤ 8.1.2
5 vendors · 26 products
References
11 links- www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-via-s-pdif-muxer-spdifenc-cThird Party AdvisoryAdvisory
