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CVE-2025-64508— Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input

Quick assessment

Affected
bugsink bugsink
Exploitation
Public or AI PoC available; prioritize validation
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 2.0.5之前版本存在安全漏洞，该漏洞源于服务器在处理高度压缩的brotli流时未应用最大限制，可能导致内存耗尽和拒绝服务攻击。

CVSS 7.5 · High EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-64508

Vulnerability Information
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Vulnerability Title
Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input
Source: CVE Program / CVE List V5
Vulnerability Description
Bugsink is a self-hosted error tracking tool. In versions prior to 2.0.5, brotli "bombs" (highly compressed brotli streams, such as many zeros) can be sent to the server. Since the server will attempt to decompress these streams before applying various maximums, this can lead to exhaustion of the available memory and thus a 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 version `2.0.5`. The vulnerability is similar to, but distinct from, another brotli-related problem in Bugsink, GHSA-rrx3-2x4g-mq2h/CVE-2025-64509.
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 2.0.5之前版本存在安全漏洞，该漏洞源于服务器在处理高度压缩的brotli流时未应用最大限制，可能导致内存耗尽和拒绝服务攻击。
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

Vendor Product Affected Versions CPE Subscribe
bugsink bugsink < 2.0.5 -

II. Public POCs for CVE-2025-64508

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8823 chars
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III. Intelligence Information for CVE-2025-64508

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IV. Related Vulnerabilities

Same product: bugsink
Same vendor: bugsink
Same weakness: CWE-770

V. Comments for CVE-2025-64508

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