CVE-2025-68435: Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication by

Q: How do I fix CVE-2025-68435?

zerobyte: upgrade to 0.18.5. Exact commands for each OS are on this page.

Q: Is CVE-2025-68435 being exploited?

CVE-2025-68435 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-2025-68435 affect?

CVE-2025-68435 affects zerobyte. Severity is critical (CVSS 9.1). Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints

Q: How urgent is CVE-2025-68435?

Priority 46/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2025-68435 is a critical-severity flaw (CVSS 9.1) affecting zerobyte. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints being accessible without valid session credentials. This is dangerous for those who have exposed Zerobyte to be used outside of their internal network. A fix has been applied in both version 0.19.0 and 0.18.5.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-305
Published	2025-12-17
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nicotsx

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

Am I affected?

Timeline

2025-12-17 23:16 UTCPublished CVE record published
2026-06-17 09:59 UTCUpdated Record last modified

nicotsx zerobyte UPGRADE

Affected: < 0.18.5 · 0.19.0 beta1

Fixed in: 0.18.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.18.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zerobyte

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-2025-68435?

zerobyte: upgrade to 0.18.5. Exact commands for each OS are on this page.

Is CVE-2025-68435 being exploited?

CVE-2025-68435 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-2025-68435 affect?

CVE-2025-68435 affects zerobyte. Severity is critical (CVSS 9.1). Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints

How urgent is CVE-2025-68435?

Priority 46/100. Critical severity; Remotely exploitable, no login, no user action

References

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