What’s Vulnerable › Vulnerabilities

CVE-2026-25577: Emmett has an Unhandled CookieError Exception Causing Denial of Service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-10 · updated 2026-06-17
• Weakness: CWE-248

Description

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.

Affected products

• emmett-framework core: before 1.3.11

References

• https://github.com/emmett-framework/core/commit/9557ea23a27cbadf7774d8bca6bbe4b54fa8a3ec
• https://github.com/emmett-framework/core/security/advisories/GHSA-x6cr-mq53-cc76
• https://github.com/emmett-framework/core/security/advisories/GHSA-x6cr-mq53-cc76

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