Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Oasdiff versions from 1.13.2 through 1.18.0 do not enforce the external-refs=false setting when loading a spec from a git revision (the rev:path form). An attacker who can supply an untrusted spec and get it processed under that setting can still cause external $ref resolution, enabling server-side request forgery to internal hosts or reading local files. Upgrade to github.com/oasdiff/oasdiff version 1.18.1, which enforces the setting on this path; avoiding git-revision input for untrusted specs is an alternative workaround.
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 |
|---|---|---|---|---|
| 6.0 | Medium | 4.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0050, the 43rd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:59 UTC First seen by agentprime
- 31 Oct 2026, 14:59 UTC Confirmed by OSV