DEBIAN-CVE-2026-1979
A flaw has been found in mruby up to 3.4.0. This affects the function mrb_vm_exec of the file src/vm.c of the component JMPNOT-to-JMPIF Optimization. Executing a manipulation can lead to use after free. The attack needs to be launched locally. The exploit has been published and may be used. This patch is called e50f15c1c6e131fa7934355eb02b8173b13df415. It is advisable to implement a patch to correct this issue.
DEBIAN-CVE-2026-1979
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-1979
mruby
Source reference: /affected/0/package/name
- Affected versions
- 3.1.0-3
Source reference:
/affected/0/versions3.2.0-1Source reference:
/affected/0/versions3.2.0-2Source reference:
/affected/0/versions3.3.0-1Source reference:
/affected/0/versions3.3.0~rc2-1Source reference:
/affected/0/versions3.4.0-1Source reference:
/affected/0/versions3.4.0-1~exp1Source reference:
/affected/0/versions3.4.0-1~exp2Source reference:
/affected/0/versions3.4.0-2Source reference:
/affected/0/versions3.4.0-3Source reference:
/affected/0/versions4.0.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
mruby
Source reference: /affected/1/package/name
- Affected versions
- 3.3.0-1
Source reference:
/affected/1/versions3.4.0-1Source reference:
/affected/1/versions3.4.0-1~exp1Source reference:
/affected/1/versions3.4.0-1~exp2Source reference:
/affected/1/versions3.4.0-2Source reference:
/affected/1/versions3.4.0-3Source reference:
/affected/1/versions4.0.0-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
mruby
Source reference: /affected/2/package/name
- Affected versions
- 3.3.0-1
Source reference:
/affected/2/versions3.4.0-1Source reference:
/affected/2/versions3.4.0-1~exp1Source reference:
/affected/2/versions3.4.0-1~exp2Source reference:
/affected/2/versions3.4.0-2Source reference:
/affected/2/versions3.4.0-3Source reference:
/affected/2/versions - Fixed versions
- 4.0.0-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mruby",
"purl": "pkg:deb/debian/mruby?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.1.0-3",
"3.2.0-1",
"3.2.0-2",
"3.3.0-1",
"3.3.0~rc2-1",
"3.4.0-1",
"3.4.0-1~exp1",
"3.4.0-1~exp2",
"3.4.0-2",
"3.4.0-3",
"4.0.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1979.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "mruby",
"purl": "pkg:deb/debian/mruby?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.3.0-1",
"3.4.0-1",
"3.4.0-1~exp1",
"3.4.0-1~exp2",
"3.4.0-2",
"3.4.0-3",
"4.0.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1979.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.0.0-1"
}
]
}
],
"package": {
"name": "mruby",
"purl": "pkg:deb/debian/mruby?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.3.0-1",
"3.4.0-1",
"3.4.0-1~exp1",
"3.4.0-1~exp2",
"3.4.0-2",
"3.4.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1979.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #55572 · Revision 1
- Added to Heist Feed
- Publisher date