# CVE-2026-70457

## Summary

- **CVE ID:** CVE-2026-70457
- **Severity:** HIGH
- **CVSS Score:** 8.3 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-131, CWE-787
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 14, 2026

## Description

rsync 3.2.3 before 3.5.0 contains an out-of-bounds write in parse_size_arg() where the return value of snprintf() is used directly as an index into a .bss-segment array without bounds checking. When snprintf truncates the formatted size string, the return value equals the number of characters that would have been written including the truncated portion, and this value may exceed the array length. The subsequent indexed write targets memory outside the intended array bounds, corrupting .bss memory.

## Affected Products

- RsyncProject — rsync (3.2.3)
- RsyncProject — rsync (3.5.0)

## References

- [CNA](https://github.com/RsyncProject/rsync/security/advisories/GHSA-pg7g-xqmr-xpfh)
- [CNA](https://github.com/RsyncProject/rsync/releases/tag/v3.5.0)
- [CNA](https://www.vulncheck.com/advisories/rsync-out-of-bounds-write-via-parse-size-arg)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 31.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._