CVE-2026-44332: Fiber is an Express inspired web framework written in Go

Q: How do I fix CVE-2026-44332?

fiber: upgrade to 3.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-44332 being exploited?

CVE-2026-44332 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-2026-44332 affect?

CVE-2026-44332 affects fiber. Severity is medium (CVSS 5.3). Fiber is an Express inspired web framework written in Go. Prior to 3.3.0, the default Authorizer function in the BasicAuth middleware in middleware/basicauth/config.go uses short-circuit evaluation that skips password hash comparison for no

Q: How urgent is CVE-2026-44332?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-44332 is a medium-severity flaw (CVSS 5.3) affecting fiber. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Fiber is an Express inspired web framework written in Go. Prior to 3.3.0, the default Authorizer function in the BasicAuth middleware in middleware/basicauth/config.go uses short-circuit evaluation that skips password hash comparison for non-existent usernames, enabling reliable remote username enumeration through response timing differences. This issue is fixed in version 3.3.0.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-203
Published	2026-07-08
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-08 20:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

gofiber fiber UPGRADE

Affected: < 3.3.0

Fixed in: 3.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.3.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fiber

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-2026-44332?

fiber: upgrade to 3.3.0. Exact commands for each OS are on this page.

Is CVE-2026-44332 being exploited?

CVE-2026-44332 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-2026-44332 affect?

CVE-2026-44332 affects fiber. Severity is medium (CVSS 5.3). Fiber is an Express inspired web framework written in Go. Prior to 3.3.0, the default Authorizer function in the BasicAuth middleware in middleware/basicauth/config.go uses short-circuit evaluation that skips password hash comparison for no

How urgent is CVE-2026-44332?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-45045 MEDIUM 5.3 UPGRADE Fiber is an Express inspired web framework written in Go
CVE-2026-53624 MEDIUM 4.8 UPGRADE Fiber is an Express inspired web framework written in Go

References

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