Crypt::SysRandom::XS versions before 0.010 for Perl is vulnerable to a heap buffer overflow in the XS function random_bytes().
The function does not validate that the length parameter is non-negative. If a negative value (e.g. -1) is supplied, the expression length + 1u causes an integer wraparound, resulting in a zero-byte allocation. The subsequent call to chosen random function (e.g. getrandom) passes the original negative value, which is implicitly converted to a large unsigned value (typically SIZE_MAX). This can result in writes beyond the allocated buffer, leading to heap memory corruption and application crash (denial of service).
In common usage, the length argument is typically hardcoded by the caller, which reduces the likelihood of attacker-controlled exploitation. Applications that pass untrusted input to this parameter may be affected.
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References
History
Fri, 27 Feb 2026 09:15:00 +0000
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Thu, 26 Feb 2026 23:45:00 +0000
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| Description | Crypt::SysRandom::XS versions before 0.010 for Perl is vulnerable to a heap buffer overflow in the XS function random_bytes(). The function does not validate that the length parameter is non-negative. If a negative value (e.g. -1) is supplied, the expression length + 1u causes an integer wraparound, resulting in a zero-byte allocation. The subsequent call to chosen random function (e.g. getrandom) passes the original negative value, which is implicitly converted to a large unsigned value (typically SIZE_MAX). This can result in writes beyond the allocated buffer, leading to heap memory corruption and application crash (denial of service). In common usage, the length argument is typically hardcoded by the caller, which reduces the likelihood of attacker-controlled exploitation. Applications that pass untrusted input to this parameter may be affected. | |
| Title | Crypt::SysRandom::XS versions before 0.010 for Perl is vulnerable to a heap buffer overflow in the XS function random_bytes() | |
| Weaknesses | CWE-122 CWE-1284 |
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published: 2026-02-26T23:29:16.488Z
Updated: 2026-02-26T23:29:16.488Z
Reserved: 2026-02-16T20:27:02.194Z
Link: CVE-2026-2597
Vulnrichment
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NVD
Status : Received
Published: 2026-02-27T00:16:58.587
Modified: 2026-02-27T00:16:58.587
Link: CVE-2026-2597
Redhat
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