PT-2026-43298 · Algernon · Algernon

Katrielmoses · Published 2026-05-26 · Updated 2026-05-26 · CVE-2026-43982

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Algernon versions prior to 1.17.6

Description The uploadedFileSaveIn() function in lua/upload/upload.go uses filepath.Join() with a directory provided by the caller without performing a boundary check after the operation. This allows a directory path such as ../../../tmp to resolve to /tmp, enabling files to be saved outside the intended web root.

Recommendations Update to version 1.17.6.

Exploit

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-43982

GHSA-2J2C-PV62-MMCP

Affected Products

Algernon

References · 5

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43982.json · Exploit
• https://osv.dev/vulnerability/CVE-2026-43982 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43982 · Security Note
• https://github.com/xyproto/algernon/security/advisories/GHSA-2j2c-pv62-mmcp · Note
• https://github.com/xyproto/algernon/issues/172 · Note