Process crash via unbounded UPS response parsing
Published May 29, 2026 · Updated May 29, 2026
Stack-based buffer overflow in Shibby Tomato 1.0 through 1.28 allows remote authenticated users to crash the UPS CGI process. In tomatoups.cgi, sub_9068 parses an attacker-controlled ITEMP field with an unbounded %s conversion into a 64-byte stack buffer, so the terminating NUL overwrites adjacent stack data. Exploitation requires access to the CGI path and control or tampering of the queried UPS service response; the demonstrated consequence is a SIGSEGV process crash.
Summary
What happened
Stack-based buffer overflow in Shibby Tomato 1.0 through 1.28 allows remote authenticated users to crash the UPS CGI process. In tomatoups.cgi, sub_9068 parses an attacker-controlled ITEMP field with an unbounded %s conversion into a 64-byte stack buffer, so the terminating NUL overwrites adjacent stack data. Exploitation requires access to the CGI path and control or tampering of the queried UPS service response; the demonstrated consequence is a SIGSEGV process crash.
The record
- CVE
- CVE-2026-10066
- Published
- May 29, 2026
- Updated
- May 29, 2026
- Vendor
- Shibby
- Product
- Tomato
- Classifications
- CWE-121, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 29, 2026CVE publishedPublication date reported by the CVE source.
- May 29, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0
- Affected versionversion=1.1
- Affected versionversion=1.10
- Affected versionversion=1.11
- Affected versionversion=1.12
- Affected versionversion=1.13
- Affected versionversion=1.14
- Affected versionversion=1.15
- Affected versionversion=1.16
- Affected versionversion=1.17
- Affected versionversion=1.18
- Affected versionversion=1.19
- Affected versionversion=1.2
- Affected versionversion=1.20
- Affected versionversion=1.21
- Affected versionversion=1.22
- Affected versionversion=1.23
- Affected versionversion=1.24
- Affected versionversion=1.25
- Affected versionversion=1.26
- Affected versionversion=1.27
- Affected versionversion=1.28
- Affected versionversion=1.3
- Affected versionversion=1.4
- Affected versionversion=1.5
- Affected versionversion=1.6
- Affected versionversion=1.7
- Affected versionversion=1.8
- Affected versionversion=1.9
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- tomatoups.cgi overflow reproduction bundleproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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