CVE-2025-65409: A divide-by-zero in the encryption/decryption routines of GNU Recutils v1.9 allows attackers to cause a Denial

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2025-65409 is a high-severity flaw (CVSS 7.5) affecting recutils. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A divide-by-zero in the encryption/decryption routines of GNU Recutils v1.9 allows attackers to cause a Denial of Service (DoS) via inputting an empty value as a password.

Why this priority

High severity
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	7.5 (High)
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-369
Published	2025-12-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: gnu

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

Am I affected?

Timeline

2025-12-30 18:15 UTCPublished CVE record published
2026-06-17 09:55 UTCUpdated Record last modified

gnu recutils DOWNGRADE

Affected: 1.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.9 (Debian / Ubuntu)

apt-cache madison recutils sudo apt install recutils=<VERSION_BEFORE_1.9> sudo apt-mark hold recutils

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

dnf --showduplicates list recutils sudo dnf downgrade recutils-<VERSION_BEFORE_1.9> sudo dnf versionlock add recutils

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-2025-65409?

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

Is CVE-2025-65409 being exploited?

CVE-2025-65409 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-2025-65409 affect?

CVE-2025-65409 affects recutils. Severity is high (CVSS 7.5). A divide-by-zero in the encryption/decryption routines of GNU Recutils v1.9 allows attackers to cause a Denial of Service (DoS) via inputting an empty value as a password.

How urgent is CVE-2025-65409?

Priority 44/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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