CVE catalog
CVE-2026-79590
A NULL pointer dereference vulnerability exists in the Prism parser component of mruby 4.0.0. An attacker can provide a specially crafted Ruby source file that triggers the parser to pass a NULL point
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.37% · Oct 25, 2026
A NULL pointer dereference vulnerability exists in the Prism parser component of mruby 4.0.0. An attacker can provide a specially crafted Ruby source file that triggers the parser to pass a NULL pointer to nonnull string handling functions, resulting in undefined behavior and application crash.
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 | mruby | sid | 4.0.0-1 | vulnerable |
| Debian | mruby | forky | 4.0.0-1 | vulnerable |
| Debian | mruby | trixie | 3.3.0-1 | vulnerable |
| Debian | mruby | bookworm | 3.1.0-3 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mruby | source | sid | (unfixed) | not yet assigned | Not reported | [1149962] |
| Debian | mruby | source | forky | (unfixed) | not yet assigned | Not reported | [1149962] |
| Debian | mruby | source | trixie | (unfixed) | not yet assigned | Not reported | [1149962] |
| Debian | mruby | source | bookworm | (unfixed) | not yet assigned | Not reported | [1149962] |
Notes
[trixie] mruby: Minor issue [bookworm] mruby: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libmruby-dev]Affected
Source package: [mruby]
Details (2)
3.1.0-3· amd64 · bookwormAffected
nvd · mruby · debian · bookworm; nvd · mruby · debian · 12
3.1.0-3· arm64 · bookwormAffected
nvd · mruby · debian · bookworm; nvd · mruby · debian · 12
- [mruby]Affected
Details (2)
3.1.0-3· amd64 · bookwormAffected
nvd · mruby · debian · bookworm; nvd · mruby · debian · 12
3.1.0-3· arm64 · bookwormAffected
nvd · mruby · debian · bookworm; nvd · mruby · debian · 12
[Debian 13 (Trixie)]
- [libmruby-dev]Affected
Source package: [mruby]
Details (2)
3.3.0-1· amd64 · trixieAffected
nvd · mruby · debian · 13
3.3.0-1+b1· arm64 · trixieAffected
nvd · mruby · debian · 13
- [mruby]Affected
Source package: [mruby]
Details (2)
3.3.0-1· amd64 · trixieAffected
nvd · mruby · debian · 13
3.3.0-1+b1· arm64 · trixieAffected
nvd · mruby · debian · 13
Observed: