False positive: GHSA-ggxm-pgc9-g7fp (CVE-2021-31799) in SLES 15.5

[sekveaja]

What happened:
Scan on image that has ruby2.5-stdlib-2.5.9-150000.4.29.1.x86_64 installed.
It generates high vulnerability:

"vulnerability": {
"id": "GHSA-ggxm-pgc9-g7fp",
"dataSource": "GHSA-ggxm-pgc9-g7fp",
"namespace": "github:language:ruby",
"severity": "High",
"urls": [
"https://github.com/advisories/GHSA-ggxm-pgc9-g7fp"
],

:
:
"relatedVulnerabilities": [
{
"id": "CVE-2021-31799",
"dataSource": "https://nvd.nist.gov/vuln/detail/CVE-2021-31799",
"namespace": "nvd:cpe",
"severity": "High",
:
:
"artifact": {
"id": "eaed7a04652749b6",
"name": "rdoc",
"version": "6.0.1.1",
"type": "gem",
"locations": [
{
"path": "/usr/lib64/ruby/gems/2.5.0/specifications/default/rdoc-6.0.1.1.gemspec",
"layerID": "sha256:4bfdb8762be5511b925a34075857d0a0ba0849de7f77ab71b52e15e482cc2b86"
}

What you expected to happen:

According to SUSE Advisory:
https://www.suse.com/security/cve/CVE-2021-31799.html

SUSE Linux Enterprise Server 15 SP5
libruby2_5-2_5 >= 2.5.9-4.20.1
ruby2.5 >= 2.5.9-4.20.1
ruby2.5-devel >= 2.5.9-4.20.1
ruby2.5-devel-extra >= 2.5.9-4.20.1
ruby2.5-stdlib >= 2.5.9-4.20.1
Patchnames:
SUSE Linux Enterprise Module for Basesystem 15 SP5 GA libruby2_5-2_5-2.5.9-150000.4.26.1
SUSE Linux Enterprise Module for Basesystem 15 SP5 GA ruby2.5-2.5.9-150000.4.26.1

The installed version in the container is ruby2.5-stdlib-2.5.9-150000.4.29.1.x86_64

rpm -qf /usr/lib64/ruby/gems/2.5.0/specifications/default/rdoc-6.0.1.1.gemspec
ruby2.5-stdlib-2.5.9-150000.4.29.1.x86_64

It is more recent then minimal requirement from SUSE Advsiory.

How to reproduce it (as minimally and precisely as possible):

1)Create the Dockerfile with this content:

FROM registry.suse.com/suse/sle15:15.5
RUN zypper in -y --no-recommends ruby2.5-rubygem-bundler=1.16.1-3.3.1
ENTRYPOINT [""]
CMD ["bash"]

2. Build an image from Dockerfile

docker build -t "suse15.5_test:v1" ./Dockerfile
docker run -it suse15.5_test:v1 bash
grype suse15.5_test:v1

3. Test with Grype now
   $ grype --distro sles:15.5 suse15.5_test:v1
   rdoc 6.0.1.1 6.1.2.1 gem GHSA-ggxm-pgc9-g7fp High

Anything else we need to know?:

Environment:
$ grype --version
grype 0.76.0

bash-4.4$ cat /etc/release

NAME="SLES"
VERSION="15-SP5"
VERSION_ID="15.5"
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP5"
ID="sles"
ID_LIKE="suse"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:suse:sles:15:sp5"
DOCUMENTATION_URL="https://documentation.suse.com/"