Vulnerability in O2sh Onefetch
CVE-2026-100866
onefetch through 2.28.1 writes repository information field values to the terminal without removing control characters, allowing terminal escape sequence injection. Attackers can embed ANSI/OSC escape sequences in project manifest version and name fields to manipulate terminal output, rewrite window titles, hide text, or trigger emulator-specific behavior when victims run onefetch.
Published .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/o2sh/onefetch (product)
- github.com/o2sh/onefetch/blob/9beb80329cf2e5bd784270f668139f0bafb48e2b/src/info… (technical-description)
- github.com/o2sh/onefetch/blob/9beb80329cf2e5bd784270f668139f0bafb48e2b/src/info… (technical-description)
- github.com/o2sh/onefetch/issues/1828 (issue-tracking)
- www.vulncheck.com/advisories/onefetch-through-2.28.1-terminal-escape-sequence-i… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100866?
- CVE-2026-100866 is a low-severity vulnerability in O2sh Onefetch, classified under CWE-150. CVSS score: 3.3/10. Published 2026-09-27.
- How severe is CVE-2026-100866?
- Low severity. CVSS v3 base score is 3.3 out of 10.