Memory disclosure or crash via delta overflow
Published Sep 22, 2026 · Updated Sep 22, 2026
Out-of-bounds read in Net::IDN::Punycode before 2.590 allows attackers to disclose memory or crash a process via crafted text. The XS encode_punycode routine accumulates delta in a signed integer without an overflow check, then accepts a wrapped negative or 36 index for its 36-byte digit table. Only the XS backend is affected, and an application must pass attacker-supplied text to an encoding path; the consequence is limited to memory disclosure or process termination.
Summary
What happened
Out-of-bounds read in Net::IDN::Punycode before 2.590 allows attackers to disclose memory or crash a process via crafted text. The XS encode_punycode routine accumulates delta in a signed integer without an overflow check, then accepts a wrapped negative or 36 index for its 36-byte digit table. Only the XS backend is affected, and an application must pass attacker-supplied text to an encoding path; the consequence is limited to memory disclosure or process termination.
The record
- CVE
- CVE-2026-74765
- Published
- Sep 22, 2026
- Updated
- Sep 22, 2026
- Vendor
- Paul Johnson
- Product
- Net-IDN-Encode
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 22, 2026CVE publishedPublication date reported by the CVE source.
- Sep 22, 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=0 <2.590
What conditions does exploitation require?
What is affected?
Published CVSS scores
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CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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