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CVE-2026-53500— Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot

CVSS 8.2 · High EPSS 0.29% · P21

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
thumborthumbor< 7.8.0affected
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I. Basic Information for CVE-2026-53500

Vulnerability Information
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Vulnerability Title
Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot
Source: CVE Program / CVE List V5
Vulnerability Description
Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
thumbor 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
thumbor thumbor是thumbor组织开源的一个图像处理服务。 thumbor 7.8.0之前版本存在服务端请求伪造漏洞，该漏洞源于ALLOWED_SOURCES配置将纯字符串传递给re.match()而未转义点，导致主机名在点位置不同也能匹配白名单，可能造成服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
thumborthumbor < 7.8.0 -

II. Public POCs for CVE-2026-53500

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 6919 chars
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III. Intelligence Information for CVE-2026-53500

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Patches & Fixes for CVE-2026-53500 (2)

Vendor Advisories for CVE-2026-53500 (1)

Same Patch Batch · thumbor · 2026-07-31 · 6 CVEs total

CVE-2026-535028.7 HIGHThumbor has path traversal via post-validation URL decoding bypass in file_loader
CVE-2026-535018.2 HIGHThumbor has HMAC validation bypass via multiple .replace() calls when removing URL signatu
CVE-2026-535057.5 HIGHThumbor proportion filter allows unbounded post-transform resize leading to remote DoS
CVE-2026-535037.5 HIGHThumbor convolution filter allows divide-by-zero in C extension leading to remote DoS
CVE-2026-535047.5 HIGHThumbor has Regex Denial of Service (ReDoS) in `convolution` filter

IV. Related Vulnerabilities

Same product: thumbor
Same vendor: thumbor
Same weakness: CWE-918

V. Comments for CVE-2026-53500

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