Medium
yara — security advisory
A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule files. An attacker can provide a malicious file with an invalid arena configuration (num_buffers=0) that triggers an assertion failure in yr_arena_get_ptr(), causing the application to terminate.
- Products
- yara
- Affected versions
- 3.4.0+dfsg-2, 3.4.0+dfsg-2build1, 3.4.0+dfsg-2ubuntu0.1~esm1, 3.6.3+dfsg-1ubuntu1, 3.7.1-1ubuntu1, 3.7.1-1ubuntu2, 3.7.1-1ubuntu2+esm1, 3.9.0-1, 3.9.0-1ubuntu0.1~esm1, 4.1.0-1, 4.1.3-1, 4.1.3-1build1, 4.1.3-1ubuntu0.1~esm1, 4.3.2-1, 4.4.0-1, 4.5.0-1, 4.5.0-1build1, 4.5.0-1build2, 4.5.4-1, 4.5.5-1, 4.5.7-1, 4.5.8-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-88341
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:30 UTC · Revision 1
Source evidence
A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule files. An attacker can provide a malicious file with an invalid arena configuration (num_buffers=0) that triggers an assertion failure in yr_arena_get_ptr(), causing the application to terminate.
osv:UBUNTU-CVE-2026-88341
yara
Fixed versions: Not specified
yara
Fixed versions: Not specified
yara
Fixed versions: Not specified
yara
Fixed versions: Not specified
yara
Fixed versions: Not specified
yara
Fixed versions: Not specified
yara
Fixed versions: Not specified
Complete source record
{
"id": "3b1be76da1683b7b7e5b07f7de6532361d006ee12a8bedbae59156853188a1ac",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-88341",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-88341",
"summary": "A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule files. An attacker can provide a malicious file with an invalid arena configuration (num_buffers=0) that triggers an assertion failure in yr_arena_get_ptr(), causing the application to terminate.",
"evidence": "osv:UBUNTU-CVE-2026-88341",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
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"evidence": "/affected/0/versions"
},
{
"value": "3.4.0+dfsg-2build1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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{
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"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
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{
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}
]
},
{
"name": {
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},
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"affected_versions": [
{
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"evidence": "/affected/5/versions"
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{
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{
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]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/6/versions"
},
{
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}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-88341",
"aliases": [
"UBUNTU-CVE-2026-88341"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
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],
"affected": [
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"package": {
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"database_specific": {
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},
"ecosystem_specific": {
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{
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"binary_version": "3.4.0+dfsg-2ubuntu0.1~esm1"
},
{
"binary_name": "python-yara",
"binary_version": "3.4.0+dfsg-2ubuntu0.1~esm1"
},
{
"binary_name": "python3-yara",
"binary_version": "3.4.0+dfsg-2ubuntu0.1~esm1"
},
{
"binary_name": "yara",
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}
},
{
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"package": {
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
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"3.7.1-1ubuntu1",
"3.7.1-1ubuntu2",
"3.7.1-1ubuntu2+esm1"
],
"database_specific": {
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},
"ecosystem_specific": {
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"package": {
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"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"3.9.0-1",
"3.9.0-1ubuntu0.1~esm1"
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},
"ecosystem_specific": {
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],
"modified": "2026-10-17T13:01:15.789344267Z",
"provider": "osv",
"upstream": [
"CVE-2026-88341"
],
"references": [
"https://ubuntu.com/security/CVE-2026-88341",
"https://www.cve.org/CVERecord?id=CVE-2026-88341",
"https://github.com/VirusTotal/yara/issues/2238",
"https://github.com/NOUIY/yara/commit/0cdff36723cd260243bb2b330bda555693354760"
]
},
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"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361423,
"published_at": "2026-09-22T20:17:00+00:00"
}