Bug: Issue 483106348: assimp:assimp_fuzzer_glb: Null-dereference in Assimp::glTF2Importer::ImportNode

https://issues.oss-fuzz.com/issues/483106348

Reference Info: 483106348 assimp:assimp_fuzzer_glb: Null-dereference in Assimp::glTF2Importer::ImportNode
component: [Public Trackers > 1362134 > OSS Fuzz](https://issues.oss-fuzz.com/components/1638179)
status: New
reporter: [87...@developer.gserviceaccount.com](mailto:87...@developer.gserviceaccount.com)
cc: [ki...@assimp.org](mailto:ki...@assimp.org), [kim.kulling@googlemail.com](mailto:kim.kulling@googlemail.com), [re...@fastmail.com](mailto:re...@fastmail.com)
collaborators: [co...@oss-fuzz.com](mailto:co...@oss-fuzz.com)
type: Bug
access level: Limited visibility
priority: P2
severity: S4
hotlist: [Reproducible](https://issues.oss-fuzz.com/hotlists/6182481), [Stability-UndefinedBehaviorSanitizer](https://issues.oss-fuzz.com/hotlists/6182509)
retention: Component default
Project: assimp
Reported: Feb 10, 2026

[87...@developer.gserviceaccount.com](mailto:87...@developer.gserviceaccount.com) added [comment #1](https://issues.oss-fuzz.com/issues/483106348#comment1):
Detailed Report: [https://oss-fuzz.com/testcase?key=6516334535180288](https://www.google.com/url?q=https://oss-fuzz.com/testcase?key%3D6516334535180288&sa=D&source=buganizer&usg=AOvVaw1pMwZcLIMqUv1uEA74J4ty)

Project: assimp
Fuzzing Engine: libFuzzer
Fuzz Target: assimp_fuzzer_glb
Job Type: libfuzzer_ubsan_assimp
Platform Id: linux

Crash Type: Null-dereference
Crash Address:
Crash State:
Assimp::glTF2Importer::ImportNode
Assimp::glTF2Importer::ImportNode
Assimp::glTF2Importer::ImportNodes

Sanitizer: undefined (UBSAN)

Regressed: [https://oss-fuzz.com/revisions?job=libfuzzer_ubsan_assimp&range=202601210716:202601220724](https://www.google.com/url?q=https://oss-fuzz.com/revisions?job%3Dlibfuzzer_ubsan_assimp%26range%3D202601210716:202601220724&sa=D&source=buganizer&usg=AOvVaw0rXFL0123_29nLf3KP5xLD)

Reproducer Testcase: [https://oss-fuzz.com/download?testcase_id=6516334535180288](https://www.google.com/url?q=https://oss-fuzz.com/download?testcase_id%3D6516334535180288&sa=D&source=buganizer&usg=AOvVaw0fybUaDJMKs2fX08JPAxwY)

Issue filed automatically.

See [https://google.github.io/oss-fuzz/advanced-topics/reproducing](https://www.google.com/url?q=https://google.github.io/oss-fuzz/advanced-topics/reproducing&sa=D&source=buganizer&usg=AOvVaw2PF-rd9_FrkFJ-mNErDWkF) for instructions to reproduce this bug locally.
When you fix this bug, please
* mention the fix revision(s).
* state whether the bug was a short-lived regression or an old bug in any stable releases.
* add any other useful information.
This information can help downstream consumers.

If you need to contact the OSS-Fuzz team with a question, concern, or any other feedback, please file an issue at [https://github.com/google/oss-fuzz/issues](https://www.google.com/url?q=https://github.com/google/oss-fuzz/issues&sa=D&source=buganizer&usg=AOvVaw3uDxRzHL584JLrGWXGLu6V). Comments on individual Monorail issues are not monitored.

This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without an upstream patch, then the bug report will automatically
become visible to the public.

Generated by Google IssueTracker notification system.

Start with the Assimp::glTF2Importer::ImportNode and ImportNodes entry points named in the crash stack, then follow the OSS-Fuzz reproduction instructions using testcase 6516334535180288 and the assimp_fuzzer_glb target. Done means the testcase no longer triggers the UBSAN null-dereference.

Written by the indexing model from the issue text.