CVE-2026-33416 | pnggroup libpng up to 1.6.55 PNG File Parser png_set_tRNS/png_set_PLTE use after free

VDB-353556 · CVE-2026-33416 · GCVE-0-2026-33416 PNGGROUP LIBPNG UP TO 1.6.55 PNG FILE PARSER PNG_SET_TRNS/PNG_SET_PLTE USE AFTER FREE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 3.29+ Summaryinfo A vulnerability classified as critical was found in pnggroup libpng up to 1.6.55. Impacted is the function png_set_tRNS/png_set_PLTE of the component PNG File Parser. The manipulation results in use after free. This vulnerability is identified as CVE-2026-33416. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability classified as critical has been found in pnggroup libpng up to 1.6.55. Affected is the function png_set_tRNS/png_set_PLTE of the component PNG File Parser. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The weakness was released by Halil Oktay. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-33416. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. Upgrading to version 1.6.56 eliminates this vulnerability. Productinfo Type Image Processing Software Vendor pnggroup Name libpng Version 1.6.0 1.6.1 1.6.2 1.6.3 1.6.4 1.6.5 1.6.6 1.6.7 1.6.8 1.6.9 1.6.10 1.6.11 1.6.12 1.6.13 1.6.14 1.6.15 1.6.16 1.6.17 1.6.18 1.6.19 1.6.20 1.6.21 1.6.22 1.6.23 1.6.24 1.6.25 1.6.26 1.6.27 1.6.28 1.6.29 1.6.30 1.6.31 1.6.32 1.6.33 1.6.34 1.6.35 1.6.36 1.6.37 1.6.38 1.6.39 1.6.40 1.6.41 1.6.42 1.6.43 1.6.44 1.6.45 1.6.46 1.6.47 1.6.48 1.6.49 1.6.50 1.6.51 1.6.52 1.6.53 1.6.54 1.6.55 License open-source Website Product: https://github.com/pnggroup/libpng/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Use after free CWE: CWE-416 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: libpng 1.6.56 Timelineinfo 03/26/2026 Advisory disclosed 03/26/2026 +0 days VulDB entry created 03/26/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Researcher: Halil Oktay Status: Confirmed CVE: CVE-2026-33416 (🔒) GCVE (CVE): GCVE-0-2026-33416 GCVE (VulDB): GCVE-100-353556 Entryinfo Created: 03/26/2026 07:05 Changes: 03/26/2026 07:05 (55) Complete: 🔍 Cache ID: 99:D62:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸