CVE-2021-46104: An issue was discovered in webp_server_go 0.4.0

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2021-46104 is a high-severity flaw (CVSS 7.5) affecting webp server go. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in webp_server_go 0.4.0. There is a directory traversal vulnerability that can read arbitrary file information on the server.

Why this priority

High severity
EPSS top 8%: very likely to be exploited
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	4.9% (top 8%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-01-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: webp

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

Am I affected?

Timeline

2022-01-19 13:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

webp webp server go DOWNGRADE

Affected: 0.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.4.0

1. Check installed version

apt-cache policy webp-server-go || rpm -q webp-server-go || webp-server-go --version

2. No fixed release: DOWNGRADE to a release before 0.4.0 (Debian / Ubuntu)

apt-cache madison webp-server-go sudo apt install webp-server-go=<VERSION_BEFORE_0.4.0> sudo apt-mark hold webp-server-go

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

dnf --showduplicates list webp-server-go sudo dnf downgrade webp-server-go-<VERSION_BEFORE_0.4.0> sudo dnf versionlock add webp-server-go

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: webp_server_go 0.4.0 - Path Traversal

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-2021-46104?

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

Is CVE-2021-46104 being exploited?

CVE-2021-46104 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-2021-46104 affect?

CVE-2021-46104 affects webp server go. Severity is high (CVSS 7.5). An issue was discovered in webp_server_go 0.4.0. There is a directory traversal vulnerability that can read arbitrary file information on the server.

How urgent is CVE-2021-46104?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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