Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The zip crate, versions 1.3.0 up to but not including 2.3.0, can be made to write files outside the intended directory during archive extraction. An attacker who supplies a crafted archive can use a symbolic link entry that appears earlier in the archive to redirect a later file's path, because the final canonicalized path is not checked, letting them overwrite arbitrary files when the archive is extracted. Upgrade to zip 2.3.0 or later. The source gives few details beyond this.
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 |
|---|---|---|---|---|
| 7.3 | High | 4.0 | CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:H/SI:H/SA:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0059, the 48th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:24 UTC First seen by agentprime
- 31 Oct 2026, 14:24 UTC Confirmed by OSV