Vulnerability · Published Jul 29, 2026 · Assigned by CERT-PL

CVE-2026-50642Terminal Escape Injection in diff‑so‑fancy

Medium 4.8

In plain English

A medium-severity security flaw in diff-so-fancy from so-fancy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.2%top 86.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

diff‑so‑fancy does not properly sanitize non‑SGR terminal control sequences before outputting diff data. The application only strips ANSI SGR sequences while allowing other control characters, including carriage return (\r) and escape sequences (e.g., OSC, CSI), to pass through unsanitized. An attacker can embed malicious control sequences in filenames, diff metadata, or file content that are rendered directly in the terminal during diff viewing. This can lead to output manipulation, including filename spoofing, terminal screen clearing, and clipboard injection via supported escape sequences. Successful exploitation may mislead users during code review, alter terminal state, or result in unintended command execution through clipboard hijacking. This issue has been fixed in the commit 9c81294

Affected products (as reported)

Vendor	Product	Versions
so-fancy	diff-so-fancy	0 – through 1.4.10

Weakness: CWE-116 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:L/SA:N

References

https://cert.pl/posts/2026/07/CVE-2026-41874/ third-party-advisory
https://github.com/so-fancy/diff-so-fancy product