01 Record

CVE-2026-89266

stb_vorbis through 1.22 heap buffer overflow via codebook multiplicands

HighPUBLISHEDCNA: VulnCheck

CNA base score8.8 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

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02 Description

stb_vorbis through 1.22 heap buffer overflow via codebook multiplicands

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: Not scored by EPSS
EPSS percentile: Not scored by EPSS
NVD base score: 8.8 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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
NVD analysis status: Received. NVD last modified this record on 2026-09-12.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-09-11 23:23Z4 HR AGO

Last updated

2026-09-11 23:23Z4 HR AGO

Reserved

2026-09-11

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Weaknesses

CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

2c93a9cb946e6c8e2137a226375ec286193f9aecce0225fe99941a304a4597ed

05 Affected products

VendorProductVersionsPlatforms

nothingsstb_vorbis0 to 1.22—

06 References

github.comGitHub Issue #1928https://github.com/nothings/stb/issues/1928issue-tracking
github.comGitHub Issue #1933https://github.com/nothings/stb/issues/1933issue-tracking
github.comGitHub Issue #1947https://github.com/nothings/stb/issues/1947issue-tracking
github.comVulnerable multiplicands allocation (stb_vorbis.c:3878-3880)https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L3878-L3880technical-description
github.comsetup_malloc int size parameter (stb_vorbis.c:950)https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L950technical-description
github.comhttps://github.com/nothings/stbproduct
www.vulncheck.comVulnCheck Advisory: stb_vorbis through 1.22 heap buffer overflow via codebook multiplicandshttps://www.vulncheck.com/advisories/stb-vorbis-through-1.22-heap-buffer-overflow-via-codebook-multiplicandsthird-party-advisory