CVE-2025-64508: DoS (CVSS 7.5)

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-770 CWE-770

References

Other References

https://github.com/bugsink/bugsink/commit/3f65544aab3ad5303d97009136640de97b0676a5 https://github.com/bugsink/bugsink/pull/266 https://github.com/bugsink/bugsink/security/advisories/GHSA-fc2v-vcwj-269v https://github.com/google/brotli/commit/67d78bc41db1a0d03f2e763497748f2f69946627 https://github.com/google/brotli/issues/1327 https://github.com/google/brotli/issues/1375 https://github.com/google/brotli/pull/1234 https://github.com/google/brotli/releases/tag/v1.2.0

Frequently Asked Questions

What is CVE-2025-64508? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-64508? +

CVE-2025-64508 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-64508? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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