CVE-2025-9810: TOCTOU in linenoiseHistorySave in linenoise allows local attackers to overwrite arbitrary files and change pe

Routine

MEDIUM 6.8MITIGATE

CVE-2025-9810 is a medium-severity flaw (CVSS 6.8) affecting linenoise. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

TOCTOU in linenoiseHistorySave in linenoise allows local attackers to overwrite arbitrary files and change permissions via a symlink race between fopen("w") on the history path and subsequent chmod() on the same path.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-367
Published	2025-09-01
Last modified	2026-06-17

Publisher (CNA): CyberArk Labs · Vendor: antirez

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

Am I affected?

Timeline

2025-09-01 19:15 UTCPublished CVE record published
2026-06-17 10:09 UTCUpdated Record last modified

antirez linenoise MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2025-9810?

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

Is CVE-2025-9810 being exploited?

CVE-2025-9810 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-2025-9810 affect?

CVE-2025-9810 affects linenoise. Severity is medium (CVSS 6.8). TOCTOU in linenoiseHistorySave in linenoise allows local attackers to overwrite arbitrary files and change permissions via a symlink race between fopen("w") on the history path and subsequent chmod() on the same path.

How urgent is CVE-2025-9810?

Priority 24/100. No elevated risk signals yet.

References

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