CVE catalog
CVE-2026-18839
An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those condi
- Severity
- Low · CVSS 2.2
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.13% · Oct 25, 2026
An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | popt | sid | 1.19+dfsg-2 | vulnerable |
| Debian | popt | forky | 1.19+dfsg-2 | vulnerable |
| Debian | popt | trixie | 1.19+dfsg-2 | vulnerable |
| Debian | popt | bookworm | 1.19+dfsg-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | popt | source | sid | (unfixed) | not yet assigned | Not reported | [1146722] |
| Debian | popt | source | forky | (unfixed) | not yet assigned | Not reported | [1146722] |
| Debian | popt | source | trixie | (unfixed) | not yet assigned | Not reported | [1146722] |
| Debian | popt | source | bookworm | (unfixed) | not yet assigned | Not reported | [1146722] |
Notes
[trixie] popt: Minor issue [bookworm] popt: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libpopt0]Affected
Source package: [popt]
Details (2)
1.19+dfsg-1· amd64 · bookwormAffected
nvd · popt · debian · bookworm; nvd · popt · debian · 12
1.19+dfsg-1· arm64 · bookwormAffected
nvd · popt · debian · bookworm; nvd · popt · debian · 12
- [libpopt-dev]Affected
Source package: [popt]
Details (2)
1.19+dfsg-1· amd64 · bookwormAffected
nvd · popt · debian · bookworm; nvd · popt · debian · 12
1.19+dfsg-1· arm64 · bookwormAffected
nvd · popt · debian · bookworm; nvd · popt · debian · 12
[Debian 13 (Trixie)]
- [libpopt0]Affected
Source package: [popt]
Details (2)
1.19+dfsg-2· amd64 · trixieAffected
nvd · popt · debian · 13
1.19+dfsg-2· arm64 · trixieAffected
nvd · popt · debian · 13
- [libpopt-dev]Affected
Source package: [popt]
Details (2)
1.19+dfsg-2· amd64 · trixieAffected
nvd · popt · debian · 13
1.19+dfsg-2· arm64 · trixieAffected
nvd · popt · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-18839]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-18839]
- [https://security-tracker.debian.org/tracker/CVE-2026-18839]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18839.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]