CVE-2025-64506

Publication date 25 November 2025

Last updated 11 December 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.1 · Medium

Score breakdown

Description

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_write_image_8bit function when processing 8-bit images through the simplified write API with convert_to_8bit enabled. The vulnerability affects 8-bit grayscale+alpha, RGB/RGBA, and images with incomplete row data. A conditional guard incorrectly allows 8-bit input to enter code expecting 16-bit input, causing reads up to 2 bytes beyond allocated buffer boundaries. This issue has been patched in version 1.6.51.

Status

Package Ubuntu Release Status
libpng 25.10 questing Not in release
25.04 plucky Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation
libpng1.6 25.10 questing
Fixed 1.6.50-1ubuntu0.1
25.04 plucky
Fixed 1.6.47-1.1ubuntu0.1
24.04 LTS noble
Fixed 1.6.43-5ubuntu0.1
22.04 LTS jammy
Fixed 1.6.37-3ubuntu0.1
20.04 LTS focal
Fixed 1.6.37-2ubuntu0.1~esm1
18.04 LTS bionic
Fixed 1.6.34-1ubuntu0.18.04.2+esm1
16.04 LTS xenial
Fixed 1.6.20-2ubuntu0.1~esm2
firefox 25.10 questing
Not affected
25.04 plucky
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected
thunderbird 25.10 questing
Needs evaluation
25.04 plucky
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
chromium-browser 25.10 questing
Not affected
25.04 plucky
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected

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Severity score breakdown

Parameter Value
Base score 6.1 · Medium
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-7924-1
    • libpng vulnerabilities
    • 11 December 2025

Other references