CVE-2026-71493Public exploitNetwork attack vector

Arbitrary file read via intermediate symlink traversal

Published Aug 21, 2026 · Updated Aug 21, 2026

Path traversal in Infracost before 0.10.45 allows remote attackers to read runner-accessible files through repository-controlled templates. The readFile, pathExists, isDir, and matchPaths functions accept a lexically confined path after checking only its leaf, then os.ReadFile and related operations follow an intermediate directory symlink beyond the checkout. Exploitation requires a crafted repository or pull request to be processed by Infracost; exposed content reaches generated configuration, dashboard output, or pull request comments.

CVSS severity5.9
Medium
EPSS probability0.43%
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 Infracost before 0.10.45 allows remote attackers to read runner-accessible files through repository-controlled templates. The readFile, pathExists, isDir, and matchPaths functions accept a lexically confined path after checking only its leaf, then os.ReadFile and related operations follow an intermediate directory symlink beyond the checkout. Exploitation requires a crafted repository or pull request to be processed by Infracost; exposed content reaches generated configuration, dashboard output, or pull request comments.

The record

CVE
CVE-2026-71493
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
Infracost
Product
Infracost
Classifications
CWE-22, CWE-59, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=< 0.10.45

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Infracost · Infracostversion=< 0.10.45

Published CVSS scores

5.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59Improper Link Resolution Before File Access ('Link Following')
T1005Data from Local System

Public exploit references

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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