CVE-2025-63397: Improper input validation in OneFlow v0.9.0 allows attackers to cause a segmentation fault via adding a Python

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MEDIUM 6.5REMOTEDOWNGRADE

CVE-2025-63397 is a medium-severity flaw (CVSS 6.5) affecting oneflow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper input validation in OneFlow v0.9.0 allows attackers to cause a segmentation fault via adding a Python sequence to the native code during broadcasting/type conversion.

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-20
Published	2025-11-10
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: oneflow

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-10 22:15 UTCPublished CVE record published
2026-07-05 02:17 UTCUpdated Record last modified

oneflow oneflow DOWNGRADE

Affected: 0.9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.0 (Debian / Ubuntu)

apt-cache madison oneflow sudo apt install oneflow=<VERSION_BEFORE_0.9.0> sudo apt-mark hold oneflow

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list oneflow sudo dnf downgrade oneflow-<VERSION_BEFORE_0.9.0> sudo dnf versionlock add oneflow

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-63397?

oneflow: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-63397 being exploited?

CVE-2025-63397 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-2025-63397 affect?

CVE-2025-63397 affects oneflow. Severity is medium (CVSS 6.5). Improper input validation in OneFlow v0.9.0 allows attackers to cause a segmentation fault via adding a Python sequence to the native code during broadcasting/type conversion.

How urgent is CVE-2025-63397?

Priority 40/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

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References

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