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Vulnerability record · CVE-2026-70456 · published 13 August 2026

CVE-2026-70456: Out-of-bounds write vulnerability

rsync 3.0.1 before 3.5.0 contains an out-of-bounds write vulnerability in the read_args() function that allows a malicious sender to corrupt adjacent heap memory by sending a crafted argument list. When the argument count causes the argv allocation to be exactly full, the trailing NULL terminator is written one slot beyond the allocation boundary, corrupting adjacent heap memory.

8.8 CVSS 4.0 High EPSS 0.54% · top 56.7% CWE-787 · Out-of-bounds write Awaiting Analysis
8.8CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
8 Sep 2026Last modified by NVD

Description

rsync 3.0.1 before 3.5.0 contains an out-of-bounds write vulnerability in the read_args() function that allows a malicious sender to corrupt adjacent heap memory by sending a crafted argument list. When the argument count causes the argv allocation to be exactly full, the trailing NULL terminator is written one slot beyond the allocation boundary, corrupting adjacent heap memory.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
https://github.com/RsyncProject/rsync/security/advisories/GHSA-78jc-79jv-v6rw
https://www.vulncheck.com/advisories/rsync-heap-out-of-bounds-write-via-read-args

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Source: NIST National Vulnerability Database (record CVE-2026-70456), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.