UnratedFix available
irssi — security advisory
Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.
- Products
- irssi
- Affected versions
- Not specified
- Fixed versions
- 0.8.13-2
- CVEs
- CVE-2009-1959
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:45 UTC · Revision 1
Source evidence
Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.
osv:DEBIAN-CVE-2009-1959
irssi
Fixed versions: 0.8.13-2
irssi
Fixed versions: 0.8.13-2
irssi
Fixed versions: 0.8.13-2
Complete source record
{
"id": "2ee84142a8fe4c681217808d978518c23472644e149d9eb222eb1d9d1c808a3b",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2009-1959",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2009-1959",
"summary": "Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.",
"evidence": "osv:DEBIAN-CVE-2009-1959",
"products": [
{
"name": {
"value": "irssi",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.8.13-2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "irssi",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.8.13-2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "irssi",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.8.13-2",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "DEBIAN-CVE-2009-1959",
"aliases": [
"DEBIAN-CVE-2009-1959"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.8.13-2"
}
]
}
],
"package": {
"name": "irssi",
"purl": "pkg:deb/debian/irssi?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2009-1959.json"
},
"ecosystem_specific": {
"urgency": "low"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.8.13-2"
}
]
}
],
"package": {
"name": "irssi",
"purl": "pkg:deb/debian/irssi?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2009-1959.json"
},
"ecosystem_specific": {
"urgency": "low"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.8.13-2"
}
]
}
],
"package": {
"name": "irssi",
"purl": "pkg:deb/debian/irssi?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2009-1959.json"
},
"ecosystem_specific": {
"urgency": "low"
}
}
],
"modified": "2026-10-23T17:47:51.010504665Z",
"provider": "osv",
"upstream": [
"CVE-2009-1959"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2009-1959"
]
},
"related_cves": [
{
"value": "CVE-2009-1959",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 419278,
"published_at": "2009-06-08T01:00:00.767+00:00"
}