CVE-2026-25577Public exploitNetwork attack vector

Service disruption via uncaught cookie parsing exception

Published Feb 10, 2026 · Updated Feb 10, 2026

Denial of service in Emmett-Core before 1.3.11 allows remote attackers to disrupt request processing via malformed Cookie headers. Request.cookies passes each untrusted Cookie segment to SimpleCookie.load without catching CookieError, so an illegal key propagates as an HTTP 500 error. No authentication or user interaction is required, and repeated malformed requests degrade normal service processing.

CVSS severity7.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Emmett-Core before 1.3.11 allows remote attackers to disrupt request processing via malformed Cookie headers. Request.cookies passes each untrusted Cookie segment to SimpleCookie.load without catching CookieError, so an illegal key propagates as an HTTP 500 error. No authentication or user interaction is required, and repeated malformed requests degrade normal service processing.

The record

CVE
CVE-2026-25577
Published
Feb 10, 2026
Updated
Feb 10, 2026
Vendor
Emmett Framework
Product
Emmett-Core
Classifications
CWE-703, CWE-248, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.3.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Emmett Framework · Emmett-Coreversion=< 1.3.11

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-703Improper Check or Handling of Exceptional Conditions
CWE-248Uncaught Exception
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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