A denial-of-service vulnerability exists in github.com/sirupsen/logrus when using Entry.Writer() to log a single-line payload larger than 64KB without newline characters. Due to limitations in the internal bufio.Scanner, the read fails with "token too long" and the writer pipe is closed, leaving Writer() unusable and causing application unavailability (DoS). This affects versions < 1.8.3, 1.9.0, and 1.9.2. The issue is fixed in 1.8.3, 1.9.1, and 1.9.3+, where the input is chunked and the writer continues to function even if an error is logged.
Metrics
Affected Vendors & Products
| Vendors | Products |
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| Logrus Project |
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References
History
Fri, 05 Dec 2025 11:00:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Logrus Project
Logrus Project logrus |
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| Vendors & Products |
Logrus Project
Logrus Project logrus |
Thu, 04 Dec 2025 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A denial-of-service vulnerability exists in github.com/sirupsen/logrus when using Entry.Writer() to log a single-line payload larger than 64KB without newline characters. Due to limitations in the internal bufio.Scanner, the read fails with "token too long" and the writer pipe is closed, leaving Writer() unusable and causing application unavailability (DoS). This affects versions < 1.8.3, 1.9.0, and 1.9.2. The issue is fixed in 1.8.3, 1.9.1, and 1.9.3+, where the input is chunked and the writer continues to function even if an error is logged. | |
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MITRE
Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2025-12-04T18:17:04.939Z
Reserved: 2025-11-18T00:00:00.000Z
Link: CVE-2025-65637
Vulnrichment
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NVD
Status : Received
Published: 2025-12-04T19:16:05.223
Modified: 2025-12-04T19:16:05.223
Link: CVE-2025-65637
Redhat
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