Vulnerability · Published Sep 29, 2026 · Assigned by redhat
CVE-2026-102474Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservation
Medium 4.0
In plain English
A medium-severity out-of-bounds write in Red Hat Enterprise Linux 6 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
Severity (CVSS 3.1)4.0Medium
Exploit odds (30 days)0.1%top 98.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | dash | no fix listed | DEBIAN-CVE-2026-102474 |
| Debian:13 | dash | no fix listed | DEBIAN-CVE-2026-102474 |
| Debian:14 | dash | no fix listed | DEBIAN-CVE-2026-102474 |
| Ubuntu:22.04:LTS | dash | no fix listed | UBUNTU-CVE-2026-102474 |
| Ubuntu:24.04:LTS | dash | no fix listed | UBUNTU-CVE-2026-102474 |
| Ubuntu:26.04:LTS | dash | no fix listed | UBUNTU-CVE-2026-102474 |
| Ubuntu:26.10 | dash | no fix listed | UBUNTU-CVE-2026-102474 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 6 | see references |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- https://access.redhat.com/security/cve/CVE-2026-102474 vdb-entry, x_refsource_REDHAT
- RHBZ#2543004 issue-tracking, x_refsource_REDHAT