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Libpng CVE-2026-33416

| EUVDEUVD-2026-16258 HIGH
Use After Free (CWE-416)
2026-03-26 GitHub_M
Information Disclosure Use After Free Memory Corruption Red Hat Libpng Pnggroup
7.5
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
7.5 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 26, 2026 - 17:15 euvd
EUVD-2026-16258
Analysis Generated
Mar 26, 2026 - 17:15 vuln.today
CVE Published
Mar 26, 2026 - 16:48 nvd
HIGH 7.5

DescriptionGitHub Advisory

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, png_set_tRNS and png_set_PLTE each alias a heap-allocated buffer between png_struct and png_info, sharing a single allocation across two structs with independent lifetimes. The trans_alpha aliasing has been present since at least libpng 1.0, and the palette aliasing since at least 1.2.1. Both affect all prior release lines png_set_tRNS sets png_ptr->trans_alpha = info_ptr->trans_alpha (256-byte buffer) and png_set_PLTE sets info_ptr->palette = png_ptr->palette (768-byte buffer). In both cases, calling png_free_data (with PNG_FREE_TRNS or PNG_FREE_PLTE) frees the buffer through info_ptr while the corresponding png_ptr pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to png_set_tRNS or png_set_PLTE has the same effect, because both functions call png_free_data internally before reallocating the info_ptr buffer. Version 1.6.56 fixes the issue.

Articles & Coverage 1

securityonline.info Critical RCE and UAF Flaws in libpng: CVE-2026-33416 and CVE-2026-33636

AnalysisAI

A security vulnerability in versions 1.2.1 (CVSS 7.5). High severity vulnerability requiring prompt remediation.

Technical ContextAI

CWE-416 (Use After Free). CVSS 7.5 indicates high severity. Affects versions 1.2.1.

RemediationAI

Monitor vendor channels for patch availability.

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Same technique Information Disclosure

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Vendor StatusVendor

Debian

Bug #1132012
libpng1.6
Release Status Fixed Version Urgency
bullseye vulnerable 1.6.37-3 -
bullseye (security) vulnerable 1.6.37-3+deb11u2 -
bookworm vulnerable 1.6.39-2+deb12u1 -
bookworm (security) vulnerable 1.6.39-2+deb12u3 -
trixie (security), trixie vulnerable 1.6.48-1+deb13u3 -
forky, sid vulnerable 1.6.55-1 -
(unstable) fixed (unfixed) -

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed

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CVE-2026-33416 vulnerability details – vuln.today
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