CVE-2026-84383 libheif - Heap Out-of-Bounds Write

libheif 1.22.0 to < 1.23.2 contains a heap out-of-bounds write caused by improper handling of nested iden and auxl references in Alpha planes during image decoding, letting remote attackers cause memory corruption via crafted files, exploit requires processing a crafted HEIF, HEIC, or AVIF file.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.61% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Heap Out-of-Bounds Write
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to version 1.23.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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