Vulnerability details
CVE-2026-43982
xyproto algernon
Algernon: Path traversal file write via savein()
CVSS 4.0
8.7High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| xyproto | algernon | < 1.17.6 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://github.com/xyproto/algernon/security/advisories/GHSA-2j2c-pv62-mmcp x_refsource_CONFIRM
- https://github.com/xyproto/algernon/issues/172 x_refsource_MISC
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Details
- Published
- 2026-05-26
- Last updated
- 2026-05-26
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.34%
Probability of exploitation in 30 days
28.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')