CVE-2026-86139

In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.

CVSS v3 6.9 MEDIUM

6.9^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.4 / Impact : 5.5

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/GNOME/libxml2/commit/8edbbdb09f24d26a2f900141fddc2b9d014f53b0	Patch
https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4	Release Notes

Configurations

Configuration 1 (hide)

cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-09-05 05:17

Updated : 2026-09-15 19:39

NVD link : CVE-2026-86139

Mitre link : CVE-2026-86139

CVE.ORG link : CVE-2026-86139

JSON object : View

Products Affected

xmlsoft

libxml2

CWE

CWE-190

Integer Overflow or Wraparound

{"id": "CVE-2026-86139", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-86139", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-08T13:04:02.900168Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cve@mitre.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.9, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.5, "exploitabilityScore": 1.4}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "cve@mitre.org", "affectedData": [{"vendor": "xmlsoft", "product": "libxml2", "versions": [{"status": "affected", "version": "0", "lessThan": "2.15.4", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-09-05T05:17:12.730", "references": [{"url": "https://github.com/GNOME/libxml2/commit/8edbbdb09f24d26a2f900141fddc2b9d014f53b0", "tags": ["Patch"], "source": "cve@mitre.org"}, {"url": "https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4", "tags": ["Release Notes"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cve@mitre.org", "description": [{"lang": "en", "value": "CWE-190"}]}], "descriptions": [{"lang": "en", "value": "In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow."}], "lastModified": "2026-09-15T19:39:45.267", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "18340BC5-55BB-416E-9928-3754A7AE17F7", "versionEndExcluding": "2.15.4"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}