CVE-2025-64509— Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input (via CPU)
Quick assessment
Affected
bugsink bugsink
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Bugsink是Bugsink开源的一个自托管Bug跟踪软件。 Bugsink 2.0.6之前版本存在安全漏洞，该漏洞源于特制的Brotli压缩信封可能导致CPU时间过度消耗，可能导致拒绝服务。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-64509
Vulnerability Information
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Vulnerability Title
Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input (via CPU)
Source: CVE Program / CVE List V5
Vulnerability Description
Bugsink is a self-hosted error tracking tool. In versions prior to 2.0.6, a specially crafted Brotli-compressed envelope can cause Bugsink to spend excessive CPU time in decompression, leading to denial of service. This can be done if the DSN is known, which it is in many common setups (JavaScript, Mobile Apps). The issue is patched in Bugsink 2.0.6. The vulnerability is similar to, but distinct from, another brotli-related problem in Bugsink, GHSA-fc2v-vcwj-269v/CVE-2025-64508.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Bugsink 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bugsink是Bugsink开源的一个自托管Bug跟踪软件。 Bugsink 2.0.6之前版本存在安全漏洞，该漏洞源于特制的Brotli压缩信封可能导致CPU时间过度消耗，可能导致拒绝服务。
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
II. Public POCs for CVE-2025-64509
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IV. Related Vulnerabilities
Same product: bugsink
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CVE-2026-47716
Bugsink: Issue bulk actions can affect another project’s iss -
CVE-2026-47715
Bugsink: Issue event views can show an event from another pr -
CVE-2026-47728
Bugsink: Project scoping missing in sourcemap and debug-file -
CVE-2026-44502
Bugsink: SSRF bypass in `validate_webhook_url` -
CVE-2026-40162
Bugsink affected by authenticated arbitrary file write in ar
Same vendor: bugsink
-
CVE-2026-47716
Bugsink: Issue bulk actions can affect another project’s iss -
CVE-2026-47715
Bugsink: Issue event views can show an event from another pr -
CVE-2026-47728
Bugsink: Project scoping missing in sourcemap and debug-file -
CVE-2026-44502
Bugsink: SSRF bypass in `validate_webhook_url` -
CVE-2026-40162
Bugsink affected by authenticated arbitrary file write in ar
Same weakness: CWE-770
-
CVE-2026-61617
Pterodactyl Wings SFTP write path does not enforce disk quot -
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amqp091-go has a Potential Memory Exhaustion/Protocol Violat -
CVE-2026-77801
Allocation of Resources Without Limits or Throttling in GitL -
CVE-2026-73108
RustDesk < 1.4.7 Uncontrolled Memory Allocation DoS via Byte -
CVE-2026-55620
eml_parser: DoS via deeply nested parens in Received headers
V. Comments for CVE-2025-64509
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