CVE-2025-65637: Turbopuffer Logrus denial of service (CVSS 7.5)

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Affected products

Turbopuffer Logrus1.9.0 · 1.9.2 · < 1.8.3

Remediation

Fixed in

Turbopuffer Logrus≥ 1.8.3

Patch & vendor advisories

References

https://github.com/mjuanxd/logrus-dos-pocExploitThird Party Advisory
https://github.com/mjuanxd/logrus-dos-poc/blob/main/README.mdExploitThird Party Advisory
https://github.com/sirupsen/logrus/issues/1370ExploitIssue TrackingPatch
https://github.com/sirupsen/logrus/pull/1376Issue TrackingPatch
https://github.com/sirupsen/logrus/releases/tag/v1.8.3Release Notes
https://github.com/sirupsen/logrus/releases/tag/v1.9.1Release Notes
https://github.com/sirupsen/logrus/releases/tag/v1.9.3Release Notes
https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSIRUPSENLOGRUS-5564391ExploitThird Party Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2025-65637 being actively exploited?

CVE-2025-65637 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.63%.

How severe is CVE-2025-65637?

CVE-2025-65637 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.63% probability of exploitation.

Which products are affected by CVE-2025-65637?

Affected products include Turbopuffer Logrus.

How do I fix CVE-2025-65637?

Upgrade affected software to a fixed version, for example Turbopuffer Logrus 1.8.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-65637 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo