UBUNTU-CVE-2026-14191 (CVE-2026-14191)
Vulnerability from osv_ubuntu – Published: 2026-07-01 04:16 – Updated: 2026-07-01 04:16 – Source website
VLAI
Details
An out-of-bounds heap write exists in the RAR5 recovery-volume (.rev) parser in WinRAR and UnRAR (RecVolumes5::ReadHeader in recvol5.cpp). The RecItems vector is sized only when the first .rev file in a set is processed; subsequent .rev files supply an independent RecNum value that is validated against that file's own TotalCount field but never against the actual size of RecItems. A crafted set of two or more .rev files can therefore write an attacker-controlled 32-bit value (the header's RevCRC field) to RecItems[RecNum] at an attacker-controlled offset up to 65534 * sizeof(RecVolItem) bytes past the allocation, corrupting adjacent heap objects. Triggering requires the victim to run a recovery/test operation on an attacker-supplied .rev set (for example 'unrar t x.part1.rev', WinRAR 'Repair archive', or auto-recovery when extracting a volume set with a missing .rar part). This is the RAR5-path sibling of CVE-2023-40477 (which was fixed in the RAR3 path only in WinRAR 6.23). Fixed in WinRAR / RAR 7.23.
Severity
7.8 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "unrar",
"binary_version": "1:5.3.2-1+deb9u1build0.16.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "unrar-nonfree",
"purl": "pkg:deb/ubuntu/unrar-nonfree@1:5.3.2-1+deb9u1build0.16.04.1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:5.3.2-1",
"1:5.3.2-1+deb9u1build0.16.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "unrar",
"binary_version": "1:5.5.8-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "unrar-nonfree",
"purl": "pkg:deb/ubuntu/unrar-nonfree@1:5.5.8-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:5.5.8-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunrar5",
"binary_version": "1:5.6.6-2ubuntu0.1"
},
{
"binary_name": "unrar",
"binary_version": "1:5.6.6-2ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "unrar-nonfree",
"purl": "pkg:deb/ubuntu/unrar-nonfree@1:5.6.6-2ubuntu0.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:5.6.6-2",
"1:5.6.6-2build1",
"1:5.6.6-2ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunrar-headers",
"binary_version": "1:6.1.5-1ubuntu0.1"
},
{
"binary_name": "libunrar5",
"binary_version": "1:6.1.5-1ubuntu0.1"
},
{
"binary_name": "unrar",
"binary_version": "1:6.1.5-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "unrar-nonfree",
"purl": "pkg:deb/ubuntu/unrar-nonfree@1:6.1.5-1ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:6.0.5-1",
"1:6.0.7-6",
"1:6.1.2-1",
"1:6.1.3-1",
"1:6.1.3-2",
"1:6.1.4-1",
"1:6.1.5-1",
"1:6.1.5-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunrar-headers",
"binary_version": "1:7.0.7-1build1"
},
{
"binary_name": "libunrar5t64",
"binary_version": "1:7.0.7-1build1"
},
{
"binary_name": "unrar",
"binary_version": "1:7.0.7-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "unrar-nonfree",
"purl": "pkg:deb/ubuntu/unrar-nonfree@1:7.0.7-1build1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:6.2.10-2",
"1:7.0.2-1",
"1:7.0.3-1",
"1:7.0.4-1",
"1:7.0.5-1",
"1:7.0.6-1",
"1:7.0.7-1",
"1:7.0.7-1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunrar-headers",
"binary_version": "1:7.1.10-2"
},
{
"binary_name": "libunrar5t64",
"binary_version": "1:7.1.10-2"
},
{
"binary_name": "unrar",
"binary_version": "1:7.1.10-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "unrar-nonfree",
"purl": "pkg:deb/ubuntu/unrar-nonfree@1:7.1.10-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.1.5-3",
"1:7.1.6-1",
"1:7.1.7-1",
"1:7.1.8-1",
"1:7.1.9-1",
"1:7.1.10-1",
"1:7.1.10-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunrar-headers",
"binary_version": "1:7.2.4-1"
},
{
"binary_name": "libunrar5t64",
"binary_version": "1:7.2.4-1"
},
{
"binary_name": "unrar",
"binary_version": "1:7.2.4-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "unrar-nonfree",
"purl": "pkg:deb/ubuntu/unrar-nonfree@1:7.2.4-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.1.10-2",
"1:7.2.1-1",
"1:7.2.2-1",
"1:7.2.3-1",
"1:7.2.3-2",
"1:7.2.4-1"
]
}
],
"aliases": [],
"details": "An out-of-bounds heap write exists in the RAR5 recovery-volume (.rev) parser in WinRAR and UnRAR (RecVolumes5::ReadHeader in recvol5.cpp). The RecItems vector is sized only when the first .rev file in a set is processed; subsequent .rev files supply an independent RecNum value that is validated against that file\u0027s own TotalCount field but never against the actual size of RecItems. A crafted set of two or more .rev files can therefore write an attacker-controlled 32-bit value (the header\u0027s RevCRC field) to RecItems[RecNum] at an attacker-controlled offset up to 65534 * sizeof(RecVolItem) bytes past the allocation, corrupting adjacent heap objects. Triggering requires the victim to run a recovery/test operation on an attacker-supplied .rev set (for example \u0027unrar t x.part1.rev\u0027, WinRAR \u0027Repair archive\u0027, or auto-recovery when extracting a volume set with a missing .rar part). This is the RAR5-path sibling of CVE-2023-40477 (which was fixed in the RAR3 path only in WinRAR 6.23). Fixed in WinRAR / RAR 7.23.",
"id": "UBUNTU-CVE-2026-14191",
"modified": "2026-07-01T04:16:00Z",
"published": "2026-07-01T04:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-14191"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-14191"
},
{
"type": "REPORT",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-40477"
},
{
"type": "REPORT",
"url": "https://www.rarlab.com/download.htm"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-14191"
]
}
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Sightings
| Author | Source | Type | Date | Other |
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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