Link following in Realterm crun
Priority MEDIUM 40CWE-59Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-59 and the CVSS impact.
Summary
An issue was discovered in crun before 0.10.5. With a crafted image, it doesn't correctly check whether a target is a symlink, resulting in access to files outside of the container. This occurs in libcrun/linux.c and libcrun/chroot_realpath.c.
Why it matters now
EPSS 0.01418 72nd percentileScored 2026-11-07
Fix Fixed crun (crun): 0.10.5
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Realterm | crun | before 0.10.5 | 0.10.5 | Patch available | CNA |
- crun VendorRealterm Affected before 0.10.5 Fixed in 0.10.5 Patch available CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:crun_project:crun:*:*:*:*:*:*:*:* | before 0.10.5 | Vulnerable | Crun Project |
| cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* | 30 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | 31 | Vulnerable | Fedoraproject |
- cpe:2.3:a:crun_project:crun:*:*:*:*:*:*:*:* Versions before 0.10.5 Vulnerable ·Crun Project
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* Versions 30 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
Remediation
- Fix · CNA crun (crun) Fixed in 0.10.5
Timeline
- 2026-10-02 Threatist record created from CVE-2019-18837
- 2026-10-03 Alias added: GHSA-992m-xc3g-r7rj
References
Other 4
- https://github.com/containers/crun/pull/173
- https://github.com/containers/crun/releases/tag/0.10.5
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITB2UNEGHXZUR3ATYHWPSK5LJB36N7AP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DTA5SJUAKQUK6HRY2CZVJUIZP5BO3EOG/
More Realterm vulnerabilities
- TI-2019-15732 RealTerm Serial Terminal 2.0.0.70 Buffer Overflow SEH CVSS 4.0HIGH 8.5
- TI-2019-15622 RealTerm Serial Terminal 2.0.0.70 SEH Overflow Crash CVSS 4.0MEDIUM 6.9
- TI-2019-15623 RealTerm Serial Terminal 2.0.0.70 Denial of Service via Port Field CVSS 4.0MEDIUM 6.8
Sources
- CVE-2019-18837 · CVE Program
- CVE-2019-18837 · NVD
- FIRST EPSS
- GHSA-992m-xc3g-r7rj · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences