CVE-2026-33636
LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on AArch64
Description
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels remain. Because the implementation works backward from the end of the row, the final iteration dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG input if Neon is enabled. Version 1.6.56 fixes the issue.
INFO
Published Date :
March 26, 2026, 5:16 p.m.
Last Modified :
April 2, 2026, 6:42 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update libpng to version 1.6.56.
- Ensure Neon optimization is correctly handled.
- Validate input PNG data bounds.
Public PoC/Exploit Available at Github
CVE-2026-33636 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33636.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33636 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33636
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Created this repo for Git /Github action training
Java
DSA and DLA for Debian last 14 days
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33636 vulnerability anywhere in the article.
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CybersecurityNews
PNG Vulnerabilities Allow Attackers to Trigger Process Crashes, Leak Sensitive Information
Two high-severity vulnerabilities have been discovered in libpng, the widely used reference library for reading and writing PNG images. These flaws allow attackers to trigger process crashes, leak sen ... Read more
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Daily CyberSecurity
The 30-Year Glitch: RCE and ARM Exploits Uncovered in libpng Reference Library
Security researchers have disclosed two significant vulnerabilities in libpng, the official reference library for Portable Network Graphics (PNG). The flaws, which impact versions spanning decades of ... Read more
The following table lists the changes that have been made to the
CVE-2026-33636 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 02, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:* versions from (including) 1.6.36 up to (excluding) 1.6.56 Added Reference Type GitHub, Inc.: https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2 Types: Patch, Vendor Advisory -
New CVE Received by [email protected]
Mar. 26, 2026
Action Type Old Value New Value Added Description LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels remain. Because the implementation works backward from the end of the row, the final iteration dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG input if Neon is enabled. Version 1.6.56 fixes the issue. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H Added CWE CWE-125 Added CWE CWE-787 Added Reference https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869 Added Reference https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3 Added Reference https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2