Heap-based Buffer Overflow The advisory has been revoked - it doesn't affect any version of package nokogiri (opens in a new tab)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-NOKOGIRI-10494063
- published23 Jun 2025
- disclosed22 Jun 2025
- creditYifan Zhang
Introduced: 22 Jun 2025
CVE-2025-6494 (opens in a new tab)Amendment
This was deemed not a vulnerability.
Overview
nokogiri is a gem for parsing HTML, XML, SAX, and Reader.
Affected versions of this package are vulnerable to Heap-based Buffer Overflow via the hashmap_get_with_hash function in the gumbo-parser/src/hashmap.c file. An attacker can cause a crash or disrupt service by providing crafted input.
Note:
According to the maintainer of the package the code from vendored gumbo-parser is not included in the released version of Nokogiri.