oak: ReDoS in x-forwarded-proto and x-forwarded-for headers
Priority MEDIUM 63CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
oak is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. In versions 17.1.5 and below, it's possible to significantly slow down an oak server with specially crafted values of the x-forwarded-proto or x-forwarded-for headers.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00411 35th percentileScored 2026-11-07
Fix Fixed oak (oakserver): 17.1.6
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| oakserver | oak | before 17.1.6 | 17.1.6 | Patch available | CNA |
| — | @oakserver/oak (npm) | up to 14.1.0 | — | No fix listed | GHSA-r3v7-pc4g-7xp9 |
- oak Vendoroakserver Affected before 17.1.6 Fixed in 17.1.6 Patch available CNA
- @oakserver/oak (npm) Vendor— Affected up to 14.1.0 Fixed in — No fix listed GHSA-r3v7-pc4g-7xp9
Remediation
- Fix · CNA oak (oakserver) Fixed in 17.1.6
Timeline
- 2026-10-02 Threatist record created from CVE-2025-55152
- 2026-10-03 Alias added: GHSA-r3v7-pc4g-7xp9
References
Other 5
- https://github.com/oakserver/oak/security/advisories/GHSA-r3v7-pc4g-7xp9
- https://github.com/oakserver/oak/commit/b60e60330ef227707c4dc13ef0ea36192d894f44
- https://github.com/oakserver/oak
- https://github.com/oakserver/oak/blob/v17.1.5/request.ts#L142
- https://github.com/oakserver/oak/blob/v17.1.5/request.ts#L87
More oakserver vulnerabilities
- TI-2024-33237 oak's path traversal allows transfer of hidden files within the served root directory CVSS 4.0HIGH 7.7
Sources
- CVE-2025-55152 · CVE Program
- CVE-2025-55152 · NVD
- FIRST EPSS
- GHSA-r3v7-pc4g-7xp9 · GitHub Advisory Database · CC BY 4.0
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