CVE-2026-70455
Last modified
CVE-2026-70455 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N with a large value to spawn an unbounded number of Zstandard worker threads on the receiver, exhausting available thread and memory resources.. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
Description
rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N with a large value to spawn an unbounded number of Zstandard worker threads on the receiver, exhausting available thread and memory resources.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Samba | Rsync | >= 3.4.2, < 3.5.0 |
References
- https://github.com/RsyncProject/rsync/releases/tag/v3.5.0Product, Release Notes
- https://www.vulncheck.com/advisories/rsync-dos-via-zt-zstandard-compression-thread-exhaustionRelease Notes, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-70455?
How severe is CVE-2026-70455?
How do I fix CVE-2026-70455?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-70448Jenkins Ivy Report Plugin 1.2 and earlier does not configure…7.1
- CVE-2026-70449Improper validation of resource URL attributes in Apache Wic…5.3
- CVE-2026-7045A vulnerability was determined in baomidou dynamic-datasourc…6.3
- CVE-2026-70452rsync 3.1.0 before 3.5.0 contains an access control bypass v…7.4
- CVE-2026-70453rsync before 3.5.0 contains an algorithmic complexity vulner…7.5
- CVE-2026-70454rsync 3.2.0 through 3.2.3 (openssl mode) and rsync-ssl throu…8
- CVE-2026-70456rsync 3.0.1 before 3.5.0 contains an out-of-bounds write vul…8.2
- CVE-2026-70457rsync 3.2.3 before 3.5.0 contains an out-of-bounds write in …8.2
- CVE-2026-70458rsync 3.0.0 before 3.5.0 contains an out-of-bounds write vul…8.2
- CVE-2026-70459rsync 3.0.0 before 3.5.0 contains a null pointer dereference…5.3
- CVE-2026-7046The NEX-Forms – Ultimate Forms Plugin for WordPress plugin f…4.9
- CVE-2026-70460rsync 2.3.3 before 3.5.0 contains a path traversal vulnerabi…8.1
Are you affected by CVE-2026-70455?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST