Unauthenticated code execution via Authorization header overflow
Published Jun 15, 2026 · Updated Jun 15, 2026
Stack-based buffer overflow in Ritlabs TinyWeb Server 1.0 through 1.94 allows remote attackers to execute code via an Authorization header. Processing a crafted Basic Authorization value places up to 692 attacker-controlled bytes on the stack, overwriting EIP after 268 bytes. No authentication is required; the published x86 Windows exploit uses ROP and an egghunter to execute supplied shellcode.
Summary
What happened
Stack-based buffer overflow in Ritlabs TinyWeb Server 1.0 through 1.94 allows remote attackers to execute code via an Authorization header. Processing a crafted Basic Authorization value places up to 692 attacker-controlled bytes on the stack, overwriting EIP after 268 bytes. No authentication is required; the published x86 Windows exploit uses ROP and an egghunter to execute supplied shellcode.
The record
- CVE
- CVE-2026-12200
- Published
- Jun 15, 2026
- Updated
- Jun 15, 2026
- Vendor
- Ritlabs
- Product
- TinyWeb Server
- Classifications
- CWE-119, CWE-121, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 15, 2026CVE publishedPublication date reported by the CVE source.
- Jun 15, 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=1.29
- Affected versionversion=1.3
- Affected versionversion=1.30
- Affected versionversion=1.31
- Affected versionversion=1.32
- Affected versionversion=1.33
- Affected versionversion=1.34
- Affected versionversion=1.35
- Affected versionversion=1.36
- Affected versionversion=1.37
- Affected versionversion=1.38
- Affected versionversion=1.39
- Affected versionversion=1.4
- Affected versionversion=1.40
- Affected versionversion=1.41
- Affected versionversion=1.42
- Affected versionversion=1.43
- Affected versionversion=1.44
- Affected versionversion=1.45
- Affected versionversion=1.46
- Affected versionversion=1.47
- Affected versionversion=1.48
- Affected versionversion=1.49
- Affected versionversion=1.5
- Affected versionversion=1.50
- Affected versionversion=1.51
- Affected versionversion=1.52
- Affected versionversion=1.53
- Affected versionversion=1.54
- Affected versionversion=1.55
- Affected versionversion=1.56
- Affected versionversion=1.57
- Affected versionversion=1.58
- Affected versionversion=1.59
- Affected versionversion=1.6
- Affected versionversion=1.60
- Affected versionversion=1.61
- Affected versionversion=1.62
- Affected versionversion=1.63
- Affected versionversion=1.64
- Affected versionversion=1.65
- Affected versionversion=1.66
- Affected versionversion=1.67
- Affected versionversion=1.68
- Affected versionversion=1.69
- Affected versionversion=1.7
- Affected versionversion=1.70
- Affected versionversion=1.71
- Affected versionversion=1.72
- Affected versionversion=1.73
- Affected versionversion=1.74
- Affected versionversion=1.75
- Affected versionversion=1.76
- Affected versionversion=1.77
- Affected versionversion=1.78
- Affected versionversion=1.79
- Affected versionversion=1.8
- Affected versionversion=1.80
- Affected versionversion=1.81
- Affected versionversion=1.82
- Affected versionversion=1.83
- Affected versionversion=1.84
- Affected versionversion=1.85
- Affected versionversion=1.86
- Affected versionversion=1.87
- Affected versionversion=1.88
- Affected versionversion=1.89
- Affected versionversion=1.9
- Affected versionversion=1.90
- Affected versionversion=1.91
- Affected versionversion=1.92
- Affected versionversion=1.93
- Affected versionversion=1.94
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
- TinyWebRCEfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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