CVE-2026-4541
Publication date 22 March 2026
Last updated 10 July 2026
Ubuntu priority
Description
A flaw has been found in janmojzis tinyssh up to 20250501. Impacted is an unknown function of the file tinyssh/crypto_sign_ed25519_tinyssh.c of the component Ed25519 Signature Handler. This manipulation causes improper verification of cryptographic signature. The attack is restricted to local execution. The attack's complexity is rated as high. The exploitability is considered difficult. The exploit has been published and may be used. Upgrading to version 20260301 is recommended to address this issue. Patch name: 9c87269607e0d7d20174df742accc49c042cff17. Upgrading the affected component is recommended.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| tinyssh | 26.04 LTS resolute |
Needs evaluation
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
Severity score breakdown
CVSS version:
Base score
1.1 · Low
Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Base score
2.5 · Low
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-4541
- https://github.com/janmojzis/tinyssh/
- https://github.com/janmojzis/tinyssh/commit/9c87269607e0d7d20174df742accc49c042cff17
- https://github.com/janmojzis/tinyssh/issues/101
- https://github.com/janmojzis/tinyssh/issues/101#issue-3983586116
- https://github.com/janmojzis/tinyssh/pull/102
- https://github.com/janmojzis/tinyssh/releases/tag/20260301
- https://vuldb.com/?ctiid.352358
- https://vuldb.com/?id.352358
- https://vuldb.com/?submit.774687