CVE-2026-84384

libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS

Published: Sep 18, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-409

7.5HIGH

Description

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.2, crafted HEIF or AVIF mime metadata and unci image data can cause decompress_brotli() and do_inflate() to grow accumulated output without an effective size limit or MemoryHandle accounting. The brotli path has no output bound, while the zlib path checks only a small temporary buffer in a branch that valid streams do not reach, and overlapping icef units can decompress the same payload repeatedly. HeifContext::interpret_heif_file_images() processes multiple compressed metadata items during file opening, allowing a small file to consume unbounded memory and terminate the process. This issue is fixed in version 1.23.2.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-409

Affected Products

strukturag

oss-projectaka libde265, strukturag/libde265, libheif

libheifLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

https://github.com/strukturag/libheif/commit/21893e8f66c8b79363ca2809391b07d35e1a95ec

github.com

https://github.com/strukturag/libheif/releases/tag/v1.23.2

github.com

https://github.com/strukturag/libheif/security/advisories/GHSA-24wx-9w62-c96w

github.com

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