CVE-2026-70461: CWE-787 Out-of-bounds Write in RsyncProject rsync
A heap out-of-bounds write vulnerability exists in rsync versions 3.2.5 through 3.4.4. This flaw allows remote unauthenticated attackers to write one byte past the end of a heap allocation by supplying a specially crafted files-from entry containing both an interior and trailing backslash. The vulnerability occurs in the add_implied_include() function, which under-counts the trailing backslash when sizing the destination buffer. This issue affects read-only rsync daemon modules.
AI Analysis
Technical Summary
CVE-2026-70461 is a heap out-of-bounds write vulnerability in rsync versions 3.2.5 through 3.4.4. Remote unauthenticated attackers can exploit this by providing a crafted files-from entry with both an interior and trailing backslash, triggering the add_implied_include() function to miscalculate buffer size and write one byte beyond the allocated heap buffer. This vulnerability affects read-only rsync daemon modules and can be triggered remotely without authentication.
Potential Impact
Successful exploitation allows an attacker to write one byte beyond the allocated heap buffer, which can lead to memory corruption. This may result in denial of service or potentially arbitrary code execution depending on the context in which the heap corruption is leveraged. The vulnerability is remotely exploitable without authentication against read-only rsync daemon modules.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time. Until a patch is available, consider restricting access to rsync daemon modules and monitoring for suspicious files-from entries containing backslashes.
CVE-2026-70461: CWE-787 Out-of-bounds Write in RsyncProject rsync
Description
A heap out-of-bounds write vulnerability exists in rsync versions 3.2.5 through 3.4.4. This flaw allows remote unauthenticated attackers to write one byte past the end of a heap allocation by supplying a specially crafted files-from entry containing both an interior and trailing backslash. The vulnerability occurs in the add_implied_include() function, which under-counts the trailing backslash when sizing the destination buffer. This issue affects read-only rsync daemon modules.
CVSS v4.0
Score 8.8high
Affected software
RsyncProject
rsync
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-70461 is a heap out-of-bounds write vulnerability in rsync versions 3.2.5 through 3.4.4. Remote unauthenticated attackers can exploit this by providing a crafted files-from entry with both an interior and trailing backslash, triggering the add_implied_include() function to miscalculate buffer size and write one byte beyond the allocated heap buffer. This vulnerability affects read-only rsync daemon modules and can be triggered remotely without authentication.
Potential Impact
Successful exploitation allows an attacker to write one byte beyond the allocated heap buffer, which can lead to memory corruption. This may result in denial of service or potentially arbitrary code execution depending on the context in which the heap corruption is leveraged. The vulnerability is remotely exploitable without authentication against read-only rsync daemon modules.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time. Until a patch is available, consider restricting access to rsync daemon modules and monitoring for suspicious files-from entries containing backslashes.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-04T14:52:23.815Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a7ddecabf8831d5395d007a
Added to database: 08/13/2026, 15:12:10 UTC
Last enriched: 08/21/2026, 13:42:05 UTC
Last updated: 09/29/2026, 01:47:43 UTC
Views: 49
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