What’s Vulnerable › Vulnerabilities

CVE-2025-10158: Rsync: Out of bounds array access via negative index

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-18 · updated 2026-10-19
• Weakness: CWE-129

Description

A malicious client acting as the receiver of an rsync file transfer can trigger an out of bounds read of a heap based buffer, via a negative array index. The malicious rsync client requires at least read access to the remote rsync module in order to trigger the issue.

Affected products

• rsync: through 3.4.1

References

• https://attackerkb.com/assessments/fbacb2a6-d1cd-4011-bb3a-f06b1c8306b1
• https://github.com/RsyncProject/rsync/commit/797e17fc4a6f15e3b1756538a9f812b63942686f

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