CVE-2026-34757

CVSS Score & Metrics

Base Score

5.1 / 10

Vector String

                                        CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N                                    

Vulnerability Description

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer, which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata) or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This vulnerability is fixed in 1.6.57.

Vulnerability Details

Published Date

April 09, 2026

Last Modified

April 13, 2026

CWE ID

CWE-416

Source

NVD

Vendor

pnggroup

Product

libpng

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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