CVE-2026-53779Network attack vector

Unauthenticated file read via backslash traversal

Published Jun 22, 2026 · Updated Jun 22, 2026

Path traversal in WebP Server Go through 0.14.4 allows remote attackers to read files outside IMG_PATH on Windows. The handler/router.go request path passes percent-decoded backslashes through path.Clean, which normalizes only forward slashes before Windows file APIs resolve both separators. No authentication is required; exposure permits reading any host file accessible to the server process, but only on Windows deployments.

CVSS severity8.7
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in WebP Server Go through 0.14.4 allows remote attackers to read files outside IMG_PATH on Windows. The handler/router.go request path passes percent-decoded backslashes through path.Clean, which normalizes only forward slashes before Windows file APIs resolve both separators. No authentication is required; exposure permits reading any host file accessible to the server process, but only on Windows deployments.

The record

CVE
CVE-2026-53779
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
WebP Server
Product
WebP Server Go
Classifications
CWE-22, T1190, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.15.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WebP Server · WebP Server Goversion=0 <0.15.0

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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