Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The Go package github.com/ewen-lbh/ffcss before 0.2.0 is affected. Its lookupPreprocess() function strips dashes, underscores and dots from user-supplied input, but applying Unicode NFKD normalization after that step lets equivalent characters such as U+2024 and U+FE4D turn back into those characters. The source says the practical impact is low, since the function is only used for loose, case-insensitive theme lookup. Upgrade to version 0.2.0 or later, where normalization runs first.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.3 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0052, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:15 UTC First seen by agentprime
- 31 Oct 2026, 14:15 UTC Confirmed by OSV