CVE-2025-64508Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Nov 12, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
bugsink bugsink bugsink:bugsink (from the name) | before 2.0.5 | CNA record |
References
- https://github.com/bugsink/bugsink/security/advisories/GHSA-fc2v-vcwj-269vx-refsource-confirm
- https://github.com/google/brotli/issues/1327x-refsource-misc
- https://github.com/google/brotli/issues/1375x-refsource-misc
- https://github.com/bugsink/bugsink/pull/266x-refsource-misc
- https://github.com/google/brotli/pull/1234x-refsource-misc
- https://github.com/bugsink/bugsink/commit/3f65544aab3ad5303d97009136640de97b0676a5x-refsource-misc
- https://github.com/google/brotli/commit/67d78bc41db1a0d03f2e763497748f2f69946627x-refsource-misc
- https://github.com/google/brotli/releases/tag/v1.2.0x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.