CVE-2026-34757 | libpng up to 1.6.56 Chunk Setter API png_set_hIST use after free

VDB-356507 · CVE-2026-34757 · GCVE-0-2026-34757 LIBPNG UP TO 1.6.56 CHUNK SETTER API PNG_SET_HIST USE AFTER FREE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 1.26+ Summaryinfo A vulnerability marked as critical has been reported in libpng up to 1.6.56. This affects the function png_set_hIST of the component Chunk Setter API. The manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2026-34757. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component. Detailsinfo A vulnerability was found in libpng up to 1.6.56. It has been rated as critical. This issue affects the function png_set_hIST of the component Chunk Setter API. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-34757. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 1.6.57 eliminates this vulnerability. Productinfo Type Image Processing Software 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 1.6.56 License open-source 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 1.6.57 Timelineinfo 04/09/2026 Advisory disclosed 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed Confirmation: 🔒 CVE: CVE-2026-34757 (🔒) GCVE (CVE): GCVE-0-2026-34757 GCVE (VulDB): GCVE-100-356507 Entryinfo Created: 04/09/2026 11:12 Changes: 04/09/2026 11:12 (54) Complete: 🔍 Cache ID: 99:DA7:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸