Emmett has an Unhandled CookieError Exception Causing Denial of Service
Priority HIGH 72CWE-248Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service, Security bypass
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-248 and CWE-307.
Summary
Emmett is a framework designed to simplify your development process. Prior to 1.3.11, the cookies property in mmett_core.http.wrappers.Request does not handle CookieError exceptions when parsing malformed Cookie headers. This allows unauthenticated attackers to trigger HTTP 500 errors and cause denial of service. This vulnerability is fixed in 1.3.11.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00319 24th percentileScored 2026-11-07
Fix Fixed core (emmett-framework): 1.3.11emmett-core (PyPI): 1.3.11
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 |
|---|---|---|---|---|---|
| emmett-framework | core | before 1.3.11 | 1.3.11 | Patch available | CNA |
| — | emmett-core (PyPI) | before 1.3.11 | 1.3.11 | Patch available | GHSA-x6cr-mq53-cc76 |
- core Vendoremmett-framework Affected before 1.3.11 Fixed in 1.3.11 Patch available CNA
- emmett-core (PyPI) Vendor— Affected before 1.3.11 Fixed in 1.3.11 Patch available GHSA-x6cr-mq53-cc76
Remediation
- Fix · CNA core (emmett-framework) Fixed in 1.3.11
- Fix · GHSA-x6cr-mq53-cc76 emmett-core (PyPI) Fixed in 1.3.11 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-25577
- 2026-10-03 Alias added: GHSA-x6cr-mq53-cc76
References
Other 4
More emmett-framework vulnerabilities
- TI-2026-30824 Granian: Unauthenticated DoS via WebSocket subprotocol header panic CVSS 3.1HIGH 7.5
- TI-2026-30825 Granian: DoS via WSGI response header panic CVSS 3.1MEDIUM 5.9
Sources
- CVE-2026-25577 · CVE Program
- CVE-2026-25577 · NVD
- FIRST EPSS
- GHSA-x6cr-mq53-cc76 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences