What is the CVSS score of CVE-2025-66293?

CVE-2025-66293 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Ubuntu are affected by CVE-2025-66293?

A vulnerability in libpng affects applications processing PNG images with specific characteristics (palette mode with transparency and gamma correction), potentially exposing up to 1KB of adjacent…. A patch is available.

Is there a public PoC exploit available for CVE-2025-66293?

Yes, a public proof-of-concept exploit is available for CVE-2025-66293. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-66293?

Within 24 hours: Identify all systems and applications using libpng versions prior to 1.6.52 through inventory and dependency scanning. Within 7 days: Develop and test patches in development/staging environments; prioritize systems processing user-supplied PNG images. Within 30 days: Complete rollout of libpng 1.6.52+ across all production systems and verify through vulnerability rescanning.

Ubuntu CVE-2025-66293

EUVD-2025-201132 HIGH

Out-of-bounds Read (CWE-125)

2025-12-03 security-advisories@github.com

Buffer Overflow Information Disclosure Debian Ubuntu Red Hat Libpng Suse

7.1

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 15, 2026 - 16:14 euvd

EUVD-2025-201132

Analysis Generated

Mar 15, 2026 - 16:14 vuln.today

Patch released

Mar 15, 2026 - 16:14 nvd

Patch available

PoC Detected

Dec 16, 2025 - 19:12 vuln.today

Public exploit code

CVE Published

Dec 03, 2025 - 21:15 nvd

HIGH 7.1

DescriptionNVD

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.52, an out-of-bounds read vulnerability in libpng's simplified API allows reading up to 1012 bytes beyond the png_sRGB_base[512] array when processing valid palette PNG images with partial transparency and gamma correction. The PNG files that trigger this vulnerability are valid per the PNG specification; the bug is in libpng's internal state management. Upgrade to libpng 1.6.52 or later.

Analysis

Technical ContextAI

An out-of-bounds memory access occurs when code reads from or writes to memory locations outside the intended buffer boundaries. This vulnerability is classified as Out-of-bounds Read (CWE-125).

RemediationAI

A vendor patch is available — apply it immediately. Implement proper bounds checking on all array and buffer accesses. Use memory-safe languages or static analysis tools to detect OOB issues.

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Vendor StatusVendor

Ubuntu

Priority: Medium

libpng

Release	Status	Version
jammy	DNE	-
noble	DNE	-
plucky	DNE	-
questing	DNE	-
upstream	needs-triage	-
trusty	not-affected	code not present
xenial	not-affected	code not present

firefox

Release	Status	Version
jammy	not-affected	code not present
noble	not-affected	code not present
plucky	not-affected	code not present
questing	not-affected	code not present
upstream	needs-triage	-

thunderbird

Release	Status	Version
upstream	needs-triage	-
plucky	ignored	end of life, was needs-triage
jammy	not-affected	code not present
noble	not-affected	code not present
questing	not-affected	code not present

chromium-browser

Release	Status	Version
jammy	not-affected	code not present
noble	not-affected	code not present
plucky	not-affected	code not present
questing	not-affected	code not present
upstream	released	-

libpng1.6

Release	Status	Version
upstream	released	1.6.52-1
jammy	released	1.6.37-3ubuntu0.3
noble	released	1.6.43-5ubuntu0.3
bionic	released	1.6.34-1ubuntu0.18.04.2+esm2
focal	released	1.6.37-2ubuntu0.1~esm2
xenial	released	1.6.20-2ubuntu0.1~esm3
plucky	released	1.6.47-1.1ubuntu0.3
questing	released	1.6.50-1ubuntu0.3

USN-7963-1 USN-8035-1

Debian

Bug #1121877