CVE-2026-102474
Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservation
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservation
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.
- Record
CVE-2026-102474- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2026-88668
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.
- Record
EUVD-2026-88668- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-fgjp-hq6c-rfv8
A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \u...
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.
- Record
GHSA-fgjp-hq6c-rfv8- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-102474- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-787
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-102474
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.
- Record
DEBIAN-CVE-2026-102474- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-102474
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.
- Record
UBUNTU-CVE-2026-102474- CVSS 3.1
- 4.0 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVopenSUSE-SU-2026:11980-1 No score
dash-0.5.13.5-1.1 on GA media
These are all security issues fixed in the dash-0.5.13.5-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:11980-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
dashDebian:12 |
All versions, plus listed versions 0.5.12+git20240518+f47009f9a76e-10.5.12+git20240518+f47009f9a76e-20.5.12-100.5.12-110.5.12-12 Show 9 moreShow less0.5.12-20.5.12-30.5.12-40.5.12-50.5.12-60.5.12-70.5.12-80.5.12-90.5.13.5-1 |
None known |
dashDebian:13 |
All versions, plus listed versions 0.5.12+git20240518+f47009f9a76e-10.5.12+git20240518+f47009f9a76e-20.5.12-120.5.13.5-1 |
None known |
dashDebian:14 |
All versions, plus listed versions 0.5.12+git20240518+f47009f9a76e-10.5.12+git20240518+f47009f9a76e-20.5.12-120.5.13.5-1 |
None known |
dashUbuntu:14.04:LTS |
All versions, plus listed versions 0.5.7-3ubuntu10.5.7-4ubuntu1 |
None known |
dashUbuntu:16.04:LTS |
All versions, plus listed versions 0.5.7-4ubuntu20.5.8-2.1ubuntu2 |
None known |
dashUbuntu:18.04:LTS |
All versions, plus listed versions 0.5.8-2.3ubuntu10.5.8-2.5ubuntu10.5.8-2.9ubuntu10.5.8-2.10 |
None known |
dashUbuntu:20.04:LTS |
All versions, plus listed versions 0.5.10.2-6 |
None known |
dashUbuntu:22.04:LTS |
All versions, plus listed versions 0.5.11+git20210120+802ebd4-1build10.5.11+git20210903+057cd650a4ed-30.5.11+git20210903+057cd650a4ed-3build1 |
None known |
dashUbuntu:24.04:LTS |
All versions, plus listed versions 0.5.12-6ubuntu10.5.12-6ubuntu30.5.12-6ubuntu40.5.12-6ubuntu5 |
None known |
dashUbuntu:26.10 |
All versions, plus listed versions 0.5.12-12ubuntu3 |
None known |
dashUbuntu:26.04:LTS |
All versions, plus listed versions 0.5.12-12ubuntu20.5.12-12ubuntu3 |
None known |
dashopenSUSE:Tumbleweed |
before 0.5.13.5-1.1 | 0.5.13.5-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-102474 is a medium vulnerability (CVSS 4.0) in Red Hat Enterprise Linux 6, published September 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.11%, the 1st percentile. Fixed in dash 0.5.13.5-1.1.
References
access.redhat.com/security/cve/CVE-2026-102474
bugzilla.redhat.com/show_bug.cgi?id=2543004
nvd.nist.gov/vuln/detail/CVE-2026-102474
github.com/advisories/GHSA-fgjp-hq6c-rfv8
security-tracker.debian.org/tracker/CVE-2026-102474
ubuntu.com/security/CVE-2026-102474
cve.org/CVERecord?id=CVE-2026-102474
suse.com/security/cve/CVE-2026-102474