Dashboard / CVE-2026-34757

CVE-2026-34757

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 34/100
Published: 2026-04-09 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: Unchanged
C: Low
I: Low
A: None

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
debian debian_linux 11.0
libpng libpng 1.0.9 – 1.6.57

References & Advisories (6)

https://github.com/pnggroup/libpng/issues/836
Exploit Issue Tracking Mitigation
https://github.com/pnggroup/libpng/issues/837
Exploit Issue Tracking Mitigation

Bug Bounty Relevance

34 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

4.4 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploitation Probability

0.19%
Raw Score 0.001950
Percentile 9.2%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00195
2026-10-28
0.00195

Intelligence Sources

nvd ref →

External Links