CVE-2026-5314

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Impacted is the function stbtt_InitFont_internal in the library stb_truetype.h of the component TTF File Handler. Performing a manipulation results in out-of-bounds read. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way."}, {"lang": "es", "value": "Una vulnerabilidad fue encontrada en Nothings stb hasta 1.26. La funci\u00f3n impactada es stbtt_InitFont_internal en la biblioteca stb_truetype.h del componente Gestor de Archivos TTF. Realizar una manipulaci\u00f3n resulta en lectura fuera de l\u00edmites. La explotaci\u00f3n remota del ataque es posible. El exploit ha sido hecho p\u00fablico y podr\u00eda ser usado. El proveedor fue contactado tempranamente sobre esta divulgaci\u00f3n pero no respondi\u00f3 de ninguna manera."}], "id": "CVE-2026-5314", "lastModified": "2026-10-26T21:10:00.170", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-5314", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-02T13:50:16.357009Z", "version": "2.0.3"}}]}, "published": "2026-04-01T23:17:03.810", "references": [{"source": "cna@vuldb.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://gist.github.com/d0razi/cb31a92f3205a4373f19b7da25946848"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/submit/780558"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/vuln/354646"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/vuln/354646/cti"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-125"}], "source": "cna@vuldb.com", "type": "Secondary"}]}

{"bugzilla": {"description": "Nothings stb: stb_truetype.h: Nothings stb: Denial of Service via out-of-bounds read in stb_truetype.h", "id": "2454161", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454161"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in Nothings stb, specifically within the stbtt_InitFont_internal function in the stb_truetype.h library. A remote attacker can exploit this vulnerability by performing a manipulation that leads to an out-of-bounds read. This can result in a Denial of Service (DoS), making the affected component unavailable. The exploit for this vulnerability has been publicly disclosed."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid processing untrusted TrueType font files with applications that utilize the `stb_truetype.h` library. Restricting the sources of font files to trusted origins can reduce the risk of exploitation."}, "name": "CVE-2026-5314", "public_date": "2026-04-01T22:15:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-5314\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-5314\nhttps://gist.github.com/d0razi/cb31a92f3205a4373f19b7da25946848\nhttps://vuldb.com/submit/780558\nhttps://vuldb.com/vuln/354646\nhttps://vuldb.com/vuln/354646/cti"], "statement": "This Moderate impact vulnerability in Nothings stb allows a remote attacker to cause a Denial of Service. An out-of-bounds read in the stbtt_InitFont_internal function, triggered by processing a manipulated TTF file, can render the affected component unavailable. This issue affects Red Hat Community Projects that utilize the stb library for TTF file handling, such as those distributed via EPEL.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.0,1.0]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.1,1.1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.2,1.2]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.3,1.3]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.4,1.4]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.5,1.5]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.6,1.6]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.7,1.7]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.8,1.8]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.9,1.9]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.10,1.10]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.11,1.11]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.12,1.12]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.13,1.13]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.14,1.14]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.15,1.15]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.16,1.16]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.17,1.17]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.18,1.18]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.19,1.19]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.20,1.20]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.21,1.21]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.22,1.22]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.23,1.23]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.24,1.24]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.25,1.25]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.26,1.26]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "stb", "source": "cna", "vendor": "Nothings"}, "product": "stb", "vendor": "nothings"}], "analysis": {"en": {"generated_at": "2026-04-02T04:23:49.088667+00:00", "value": {"mitigation_remediation": ["Update the Nothings stb library to a version newer than 1.26 when it becomes available."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The issue affects the Nothings stb library up to and including version 1.26. Users of this library should verify whether their deployments rely on these versions and consider upgrading to a fixed release if one becomes available.", "description_and_impact": "The vulnerability is an out-of-bounds read in the function stbtt_InitFont_internal of the stb_truetype.h header in the Nothings stb library. An attacker can manipulate a TrueType font file to trigger the out-of-bounds read, potentially allowing remote exploitation. The description indicates that remote exploitation is possible, raising the risk of compromise of confidentiality, integrity, and availability of systems processing malicious font files.", "risk_and_exploitability": "The CVSS score of 5.3 places the vulnerability in the medium severity range. The EPSS score is not provided, and the vulnerability is not listed in the CISA KEV catalog. The likely attack vector involves a remote adversary delivering a crafted TTF file to an application that uses the vulnerable library, such as a graphic viewer or web browser that renders fonts."}}}}, "created": "2026-04-02T07:47:07.953583+00:00", "updated": "2026-04-02T20:16:06.199190+00:00", "vendors": ["nothings", "nothings$PRODUCT$stb"]}