CVE-2026-7233

#include <stdio.h> #include <stdlib.h> // Mocking the vulnerable function structure for PoC demonstration // This is a simplified representation based on the description. // Vulnerable function prototype (fictionalized for PoC structure) void fz_subset_cff_for_gids(unsigned char* data, int size, int* gids, int gid_count); int main() { // Crafted malicious input designed to trigger out-of-bounds read // The specific structure depends on the CFF format parsing logic unsigned char malicious_cff_data[] = { 0x01, 0x00, 0x04, 0x00, // Header 0xFF, 0xFF, 0xFF, 0xFF, // Malformed Index Count 0x00, 0x01, 0x02, 0x03 // Offsets that might lead to OOB read }; int gids[] = {1, 2, 3}; // Glyph IDs to subset printf("Attempting to trigger CVE-2026-7233..."); // Calling the function with crafted data // In a real exploit, this would be triggered by loading a font file in MuPDF fz_subset_cff_for_gids(malicious_cff_data, sizeof(malicious_cff_data), gids, 3); printf("PoC execution finished. Check for crashes or information disclosure."); return 0; }

{"cve": {"id": "CVE-2026-7233", "sourceIdentifier": "[email protected]", "published": "2026-04-28T07:16:04.067", "lastModified": "2026-05-05T21:16:23.940", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was determined in Artifex MuPDF up to 1.28.0. The impacted element is the function fz_subset_cff_for_gids of the file subset-cff.c of the component CFF Index Handler. This manipulation causes out-of-bounds read. The attack can only be executed locally. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through a bug report but has not responded yet."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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", "baseScore": 1.9, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 3.3, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 1.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 4.2}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:L/AC:L/Au:S/C:P/I:N/A:N", "baseScore": 1.7, "accessVector": "LOCAL", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "baseSeverity": "LOW", "exploitabilityScore": 3.1, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:artifex:mupdf:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.27.2", "matchCriteriaId": "296A0B90-FB84-41D4-8CEB-0AA45570E584"}]}]}], "references": [{"url": "https://artifex.com/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://bugs.ghostscript.com/show_bug.cgi?id=709328", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Third Party Advisory"]}, {"url": "https://github.com/biniamf/pocs/tree/main/mupdf-cff-indexload-oobread", "source": "[email protected]", "tags": ["Exploit"]}, {"url": "https://vuldb.com/submit/802590", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Third Party Advisory", "VDB Entry"]}, {"url": "https://vuldb.com/vuln/359840", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Third Party Advisory", "VDB Entry"]}, {"url": "https://vuldb.com/vuln/359840/cti", "source": "[email protected]", "tags": ["Permissions Required", "VDB Entry"]}, {"url": "https://bugs.ghostscript.com/show_bug.cgi?id=709328", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags ... 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