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CVE-2026-43982

Algernon: Path traversal file write via savein()

HIGH

8.7

CVSS Score

Published: May 26, 2026 at 04:30 PM UTC

Updated: July 24, 2026 at 11:23 AM UTC

1 product affected across 1 vendorAlgernon

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Severity

HIGH8.7

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, uploadedFileSaveIn() in lua/upload/upload.go uses filepath.Join() with the caller-supplied directory but performs no boundary check after joining. A directory of ../../../tmp resolves cleanly to /tmp, outside the web root. This vulnerability is fixed in 1.17.6.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Algernon · Xyproto

60%

v < 1.17.6

Affected range stops below 1.17.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_CONFIRM

Source: cverecord

https://github.com/xyproto/algernon/security/advisories/GHSA-2j2c-pv62-mmcp

x_refsource_MISC

Source: cverecord

https://github.com/xyproto/algernon/issues/172

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHGitHub_M

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-22

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