CVE-2026-40930— LIBPNG: Chunk smuggling in push-mode APNG parser via unconsumed chunk body
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Patches & Fixes for CVE-2026-40930 (1)
Vendor Advisories for CVE-2026-40930 (1)
IV. Related Vulnerabilities
Same product: libpng
- CVE-2026-34757
LIBPNG has a yse-after-free in png_set_PLTE, png_set_tRNS an - CVE-2026-33636
LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on - CVE-2026-33416
LIBPNG has use-after-free via pointer aliasing in `png_set_t - CVE-2026-3713
pnggroup libpng pnm2png pnm2png.c do_pnm2png heap-based over - CVE-2026-25646
LIBPNG has a heap buffer overflow in png_set_quantize
Same vendor: pnggroup
- CVE-2026-34757
LIBPNG has a yse-after-free in png_set_PLTE, png_set_tRNS an - CVE-2026-33636
LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on - CVE-2026-33416
LIBPNG has use-after-free via pointer aliasing in `png_set_t - CVE-2026-3713
pnggroup libpng pnm2png pnm2png.c do_pnm2png heap-based over - CVE-2026-25646
LIBPNG has a heap buffer overflow in png_set_quantize
Same weakness: CWE-436
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V. Comments for CVE-2026-40930
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