Process crash or memory disclosure via encoding setter
Published Jun 25, 2026 · Updated Jun 25, 2026
Use-after-free in Sparkle Motion Nokogiri before 1.19.4 allows remote attackers to crash CRuby processes or read freed memory. Document#encoding= frees the current encoding string before validating the replacement, so an exception leaves the document pointing to released storage that Document#encoding later reads. Exploitation requires an application to pass attacker-controlled invalid encoding data, rescue the exception, and reuse the same CRuby document; JRuby is unaffected.
Summary
What happened
Use-after-free in Sparkle Motion Nokogiri before 1.19.4 allows remote attackers to crash CRuby processes or read freed memory. Document#encoding= frees the current encoding string before validating the replacement, so an exception leaves the document pointing to released storage that Document#encoding later reads. Exploitation requires an application to pass attacker-controlled invalid encoding data, rescue the exception, and reuse the same CRuby document; JRuby is unaffected.
The record
- CVE
- CVE-2026-57236
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- Sparkle Motion
- Product
- Nokogiri
- Classifications
- CWE-416
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 1.19.4
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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