CVE-2025-65637: A denial-of-service vulnerability exists in github.com/sirupsen/logrus when using Entry.Writer() to log a sing

Q: How do I fix CVE-2025-65637?

logrus: upgrade to 1.8.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-65637 being exploited?

CVE-2025-65637 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-65637 affect?

CVE-2025-65637 affects logrus. Severity is high (CVSS 7.5). 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

Q: How urgent is CVE-2025-65637?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2025-65637 is a high-severity flaw (CVSS 7.5) affecting logrus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-400
Published	2025-12-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: turbopuffer

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-04 19:16 UTCPublished CVE record published
2026-06-17 09:55 UTCUpdated Record last modified

turbopuffer logrus UPGRADE

Affected: < 1.8.3 · 1.9.0 · 1.9.2

Fixed in: 1.8.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy logrus || rpm -q logrus || logrus --version

2. UPGRADE to 1.8.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade logrus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade logrus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-65637?

logrus: upgrade to 1.8.3. Exact commands for each OS are on this page.

Is CVE-2025-65637 being exploited?

CVE-2025-65637 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-65637 affect?

CVE-2025-65637 affects logrus. Severity is high (CVSS 7.5). 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

How urgent is CVE-2025-65637?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

GitHub vulnerabilities

References

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