Application crash via unchecked negative byte count
Published Feb 26, 2026 · Updated Feb 26, 2026
Heap buffer overflow in Crypt::SysRandom::XS before 0.010 allows attackers to crash applications through a negative byte count. random_bytes() adds one to an unchecked negative length, wraps the allocation size to zero, then passes the original value as an enormous unsigned count to the system random function. Exploitation requires a calling application to pass an attacker-controlled length; typical callers hardcode it, and the bounded reported impact is an application crash.
Summary
What happened
Heap buffer overflow in Crypt::SysRandom::XS before 0.010 allows attackers to crash applications through a negative byte count. random_bytes() adds one to an unchecked negative length, wraps the allocation size to zero, then passes the original value as an enormous unsigned count to the system random function. Exploitation requires a calling application to pass an attacker-controlled length; typical callers hardcode it, and the bounded reported impact is an application crash.
The record
- CVE
- CVE-2026-2597
- Published
- Feb 26, 2026
- Updated
- Feb 26, 2026
- Vendor
- Leon Timmermans
- Product
- Crypt::SysRandom::XS
- Classifications
- CWE-1284, CWE-122, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 26, 2026CVE publishedPublication date reported by the CVE source.
- Feb 26, 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 <0.010
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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