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CVE-2026-3713— pnggroup libpng pnm2png pnm2png.c do_pnm2png heap-based overflow

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 1.6.55及之前版本存在安全漏洞，该漏洞源于对文件contrib/pngminus/pnm2png.c中参数width/height的错误操作，可能导致堆缓冲区溢出。

CVSS 5.3 · Medium EPSS 0.15% · P4
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I. Basic Information for CVE-2026-3713

Vulnerability Information
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Vulnerability Title
pnggroup libpng pnm2png pnm2png.c do_pnm2png heap-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in pnggroup libpng up to 1.6.55. Affected by this vulnerability is the function do_pnm2png of the file contrib/pngminus/pnm2png.c of the component pnm2png. This manipulation of the argument width/height causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
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 1.6.55及之前版本存在安全漏洞，该漏洞源于对文件contrib/pngminus/pnm2png.c中参数width/height的错误操作，可能导致堆缓冲区溢出。
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 1.6.0 cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-3713

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III. Intelligence Information for CVE-2026-3713

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Vendor Advisories for CVE-2026-3713 (2)

Proof of Concept for CVE-2026-3713 (2)

Vendor Pages for CVE-2026-3713 (1)

IV. Related Vulnerabilities

Same product: libpng
Same vendor: pnggroup
Same weakness: CWE-122