Detections
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Echo: libpng1.6: security update to 1.6.56-1+e2

medium Tenable Cloud Security Plugin ID 457826

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-34757)

Solution

Update the libpng1.6 library and its related packages to version 1.6.56-1+e2 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-34757

Plugin Details

Severity: Medium

ID: 457826

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.1

Percentile: 53.55

CVSS v2

Risk Factor: Low

Base Score: 3.2

Temporal Score: 2.5

Vector: CVSS2#AV:L/AC:L/Au:S/C:P/I:P/A:N

CVSS Score Source: CVE-2026-34757

CVSS v3

Risk Factor: Medium

Base Score: 4.4

Temporal Score: 4

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/10/2026

Vulnerability Publication Date: 4/9/2026

Reference Information

CVE: CVE-2026-34757