Description
A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \u or \U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write one or two bytes past that reservation.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dash | No fix yet | — |
| Debian 13 | dash | No fix yet | — |
| Debian 12 | dash | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | dash | No fix yet | — |
| Ubuntu 26.04 LTS | dash | No fix yet | — |
| Ubuntu 24.04 LTS | dash | No fix yet | — |
| Ubuntu 22.04 LTS | dash | No fix yet | — |
| Ubuntu 20.04 LTS | dash | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | dash | No fix yet | — |
| Ubuntu 16.04 LTS | dash | No fix yet | — |
| Ubuntu 14.04 LTS | dash | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dash | 0.5.13.5-1.1 | openSUSE-SU-2026:11980-1 |
Advisories 1
- openSUSE-SU-2026:11980-1 dash-0.5.13.5-1.1 on GA media SUSE / openSUSE Security Updates · Oct 5, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-102474 vdb-entry
- RHBZ#2543004 issue-tracking