Is CVE-2021-47996 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2021-47996 being exploited in the wild.

How severe is CVE-2021-47996?

Informational severity, published 25 August 2026.

Which products and versions are affected?

nokogiri (RubyGems) ECOSYSTEM:introduced=0,fixed=1.11.4.

Is there a fix for CVE-2021-47996?

Yes. nokogiri (RubyGems): upgrade to 1.11.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Am I affected by CVE-2021-47996?

Check whether you run nokogiri (RubyGems) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2021-47996: duplicate rejection

CVE-2021-47996 · Severity: info · Published 2026-08-25

This CVE ID was rejected by NIST as a duplicate of an existing vulnerability report. No technical details or affected products could be determined from the advisory, as the CVE entry contains no substantive vulnerability information.

Technologies: nokogiri (RubyGems). Vendors: RubyGems.

Quick answers

Is CVE-2021-47996 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2021-47996 being exploited in the wild.
How severe is CVE-2021-47996?: Informational severity, published 25 August 2026.
Which products and versions are affected?: nokogiri (RubyGems) ECOSYSTEM:introduced=0,fixed=1.11.4.
Is there a fix for CVE-2021-47996?: Yes. nokogiri (RubyGems): upgrade to 1.11.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2021-47996?: Check whether you run nokogiri (RubyGems) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

nokogiri (RubyGems): upgrade to 1.11.4 or later
```
bundle update nokogiri
```

Technical details

CVE-2021-47996 was rejected by the CVE program as a duplicate entry. The NVD record does not contain a vulnerability description, affected products, or technical analysis. This rejection indicates the vulnerability was already documented under a different CVE ID. Without access to the canonical CVE entry, no technical assessment can be provided.

Affected products

nokogiri (RubyGems) ECOSYSTEM:introduced=0,fixed=1.11.4

Identifiers

CVE-2021-47996
GHSA-7rrm-v45f-jp64

Timeline

2026-08-25: other: CVE-2021-47996 rejected as duplicate

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