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CVE-2026-40930— LIBPNG: Chunk smuggling in push-mode APNG parser via unconsumed chunk body

Quick assessment

Affected
pnggroup libpng
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.

libpng是The PNG Development Group开源的一个可对PNG图形文件实现创建、读写等操作的PNG参考库。 LIBPNG 1.8.0版本存在安全漏洞，该漏洞源于推模式APNG解析器中帧间块丢弃路径未消耗块体和CRC，可能导致攻击者控制的字节被重新解释为新的块标头。

CVSS 5.4 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
pnggroup libpng = 1.8.0 affected
pnggroup libpng-apng >= 1.6.49, <= 1.6.57 affected
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I. Basic Information for CVE-2026-40930

Vulnerability Information
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Vulnerability Title
LIBPNG: Chunk smuggling in push-mode APNG parser via unconsumed chunk body
Source: CVE Program / CVE List V5
Vulnerability Description
LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
libpng 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libpng是The PNG Development Group开源的一个可对PNG图形文件实现创建、读写等操作的PNG参考库。 LIBPNG 1.8.0版本存在安全漏洞，该漏洞源于推模式APNG解析器中帧间块丢弃路径未消耗块体和CRC，可能导致攻击者控制的字节被重新解释为新的块标头。
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
pnggroup libpng = 1.8.0 -
pnggroup libpng-apng >= 1.6.49, <= 1.6.57 -

II. Public POCs for CVE-2026-40930

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III. Intelligence Information for CVE-2026-40930

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Patches & Fixes for CVE-2026-40930 (1)

Vendor Advisories for CVE-2026-40930 (1)

IV. Related Vulnerabilities

Same product: libpng
Same vendor: pnggroup
Same weakness: CWE-436