CVE-2025-65637

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.

References

Affected packages

Git / github.com/sirupsen/logrus

Affected ranges

Type: GIT
Repo: https://github.com/sirupsen/logrus
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

b30aa27cf4df89e9b96c68c063486c3162f71aef

Fixed

d40e25cd45ed9c6b2b66e6b97573a0413e4c23bd

Affected versions

1.*

1.0.2

v0.*

v0.1.0

v0.1.1

v0.10.0

v0.11.0

v0.11.1

v0.11.2

v0.11.3

v0.11.4

v0.11.5

v0.2.0

v0.3.0

v0.4.0

v0.4.1

v0.5.0

v0.5.1

v0.6.0

v0.6.1

v0.6.2

v0.6.3

v0.6.4

v0.6.5

v0.6.6

v0.7.0

v0.7.1

v0.7.2

v0.7.3

v0.8.0

v0.8.1

v0.8.2

v0.8.3

v0.8.4

v0.8.5

v0.8.6

v0.8.7

v0.9.0

v1.*

v1.0.0

v1.0.1

v1.0.3

v1.0.4

v1.0.5

v1.0.6

v1.1.0

v1.1.1

v1.2.0

v1.3.0

v1.4.0

v1.4.1

v1.4.2

v1.5.0

v1.6.0

v1.7.0

v1.7.1

v1.8.0

v1.8.1

v1.8.2

v1.9.0

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-65637.json"