Predator and CL could not provide any possible suspects.
Using the code search for the file, “cpdf_colorspace.cpp” assigning to concern owner from GIT blame.
Suspecting Commit#
https://pdfium.googlesource.com/pdfium.git/+/ce9ad1bee792856c2d9e940ecffff97145e18d32
@hnakashima  -- Could you please look into this issue, kindly reassign if it has nothing to do with your changes.
Thank You.

The following revision refers to this bug:
  https://pdfium.googlesource.com/pdfium/+/7c2daec0a5f5d5e0f442db7946e9356daa7c55b2

commit 7c2daec0a5f5d5e0f442db7946e9356daa7c55b2
Author: Henrique Nakashima <hnakashima@chromium.org>
Date: Tue Oct 17 20:52:18 2017

Fix loading mutually referencing colorspaces.

CPDF_DeviceNCS and CPDF_SeparationCS can load other colorspaces and
their v_Load() needs to pass around a set of visited spaces to avoid
stack overflows if that other colorspace references the first one.

Bug:  chromium:773095 
Change-Id: Idae26c95a8034c3ded70f70e20ae1c414d7b29c3
Reviewed-on: https://pdfium-review.googlesource.com/16250
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

[modify] https://crrev.com/7c2daec0a5f5d5e0f442db7946e9356daa7c55b2/core/fpdfapi/page/cpdf_colorspace.cpp

ClusterFuzz has detected this issue as fixed in range 509492:509608.

Detailed report: https://clusterfuzz.com/testcase?key=5216706560786432

Fuzzer: ifratric_pdf_generic
Job Type: linux_asan_pdfium
Platform Id: linux

Crash Type: Stack-overflow
Crash Address: 0x7ffc6dc09fe8
Crash State:
  CPDF_IndexedCS::v_Load
  CPDF_ColorSpace::Load
  CPDF_DeviceNCS::v_Load
  
Sanitizer: address (ASAN)

Fixed: https://clusterfuzz.com/revisions?job=linux_asan_pdfium&range=509492:509608

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5216706560786432

See https://github.com/google/clusterfuzz-tools for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 5216706560786432 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.