Critical
Security advisory
irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a malformed IRC message 324 (channel mode).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-8955
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:34 UTC · Revision 1
Source evidence
irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a malformed IRC message 324 (channel mode).
osv:CVE-2020-8955
Complete source record
{
"id": "fbbdd1def181f5b16a601f5d1bb9191e96cd6e664b9e876ab116e076cdab5ad2",
"url": "https://osv.dev/vulnerability/CVE-2020-8955",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-8955",
"summary": "irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a malformed IRC message 324 (channel mode).",
"evidence": "osv:CVE-2020-8955",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2020-8955",
"aliases": [
"CVE-2020-8955"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/weechat/weechat",
"type": "GIT",
"events": [
{
"introduced": "d6bd119d76ab62f45f4f575781f9c93c7d6c254e"
},
{
"last_affected": "236dbe3f629e2384e3e0014ec0985df3ad401534"
},
{
"fixed": "6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74da"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:weechat:weechat:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0.3.8"
},
{
"last_affected": "2.7"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74da"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v2.3",
"v2.7",
"v2.7-rc1",
"v2.6",
"v2.6-rc2",
"v2.6-rc1",
"v2.5",
"v2.5-rc2",
"v2.5-rc1",
"v2.4",
"v2.4-rc1",
"v2.3-rc1",
"v2.2",
"v2.2-rc2",
"v2.2-rc1",
"v2.1",
"v2.1-rc1",
"v2.0",
"v2.0-rc1",
"v1.9",
"v1.9-rc2",
"v1.9-rc1",
"v1.8",
"v1.8-rc1",
"v1.7",
"v1.7-rc2",
"v1.7-rc1",
"v1.6",
"v1.6-rc2",
"v1.6-rc1",
"v1.5",
"v1.5-rc2",
"v1.5-rc1",
"v1.4",
"v1.4-rc2",
"v1.4-rc1",
"v1.3",
"v1.3-rc2",
"v1.3-rc1",
"v1.2",
"v1.2-rc2",
"v1.2-rc1",
"v1.1",
"v1.1-rc2",
"v1.1-rc1",
"v1.0",
"v1.0-rc3",
"v1.0-rc2",
"v1.0-rc1",
"v0.4.3",
"v0.4.3-rc2",
"v0.4.3-rc1",
"v0.4.2",
"v0.4.2-rc2",
"v0.4.2-rc1",
"v0.4.1",
"v0.4.1-rc2",
"v0.4.1-rc1",
"v0.4.0",
"v0.4.0-rc3",
"v0.4.0-rc2",
"v0.4.0-rc1",
"v0.3.9",
"v0.3.9-rc2",
"v0.3.9-rc1",
"v0.3.8"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8955.json",
"vanir_signatures": [
{
"id": "CVE-2020-8955-1b8299ba",
"digest": {
"length": 2502,
"function_hash": "223350524238790654043842164543245510326"
},
"source": "https://github.com/weechat/weechat/commit/6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74da",
"target": {
"file": "src/plugins/irc/irc-mode.c",
"function": "irc_mode_channel_update"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-8955-afbcfe2f",
"digest": {
"threshold": 0.9,
"line_hashes": [
"200879968070498314343440529766462460162",
"267790770994180775470654757621928752132",
"84311193978423127644732102481155587185",
"37738585302980977653187765980868653464",
"103144408093402382474082176671652325727",
"248047512738540522610242778759283707096",
"13726779807730142557510816354576803671",
"304711207680069284387163760563633707915",
"134091926362240965518819909662205922465",
"77567932931264461531056880510287982960",
"61653280659459939285653700726216165635",
"144127429652462822056848416788256299906",
"293177098233781010308844640392180242208",
"285905928978361185004924297576737108114"
]
},
"source": "https://github.com/weechat/weechat/commit/6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74da",
"target": {
"file": "src/plugins/irc/irc-mode.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:54:04Z"
}
}
],
"modified": "2026-10-20T13:54:04.731763486Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ASRTCQFFDAAK347URWNDH6NSED2BGNY/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ER23GT23US5JXDLUZAMGMWXKZ74MI4S2/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M3LAJTLI3LWZRNCFYJ7PCBBTHUMCCBHH/",
"https://lists.debian.org/debian-lts-announce/2020/03/msg00031.html",
"https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html",
"https://security.gentoo.org/glsa/202003-51",
"https://weechat.org/doc/security/",
"https://github.com/weechat/weechat/commit/6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74da"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "30"
},
{
"last_affected": "30"
},
{
"introduced": "31"
},
{
"last_affected": "31"
},
{
"introduced": "32"
},
{
"last_affected": "32"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:opensuse:backports_sle:15.0:-:*:*:*:*:*:*",
"cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*"
],
"vendor_product": "opensuse:backports_sle",
"extracted_events": [
{
"range": [
{
"introduced": "15.0-NA"
},
{
"last_affected": "15.0-NA"
},
{
"introduced": "15.0-sp1"
},
{
"last_affected": "15.0-sp1"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-8955",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388356,
"published_at": "2020-02-12T22:15:13.207+00:00"
}