Avoid quadratic complexity in resolvePath in net/url

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-56860
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-13 22:17:22 UTC
Updated2026-09-03 16:37:52 UTC
DescriptionPreviously, resolving relative paths containing parent directory ('..') segments performed string conversions and buffer rewrites on each step, resulting in quadratic time complexity and high memory allocation overhead. Now, path resolution operates on a byte buffer using index-based backtracking for '..' segments, eliminating the quadratic time complexity and significantly reducing memory allocations.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from ADP

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.005180000 probability, percentile 0.421950000 (date 2026-09-07)

Problem Types: CWE-407 | CWE-407: Inefficient Algorithmic Complexity | CWE-407 CWE-407 Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net/url affected 1.25.13 semver Not specified
CNA Go Standard Library Net/url affected 1.26.0-0 1.26.6 semver Not specified
CNA Go Standard Library Net/url affected 1.27.0-0 1.27.0-rc.3 semver Not specified

References

ReferenceSourceLinkTags
groups.google.com/g/golang-announce/c/94pEornpRlI [email protected] groups.google.com
go.dev/cl/803681 [email protected] go.dev
go.dev/issue/80494 [email protected] go.dev
pkg.go.dev/vuln/GO-2026-6218 [email protected] pkg.go.dev
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