CVE-2026-4985

#include <stdio.h> #include <stdint.h> // Conceptual PoC for Integer Overflow in cgif_addframe // This demonstrates how passing large values for width/height could cause an overflow. void cgif_addframe_vulnerable(int width, int height) { // Vulnerable calculation: size = width * height * channels // If width and height are large enough (e.g., 65536), the result overflows a 32-bit integer. int channels = 4; uint32_t size = (uint32_t)width * (uint32_t)height * channels; printf("Attempted allocation for %dx%d: %u bytes\n", width, height, size); // If overflow occurs, size becomes small, but subsequent writes use large indices. char* buffer = (char*)malloc(size); if (buffer == NULL) return; // Simulate writing data that would overflow the buffer for (int i = 0; i < width * height; i++) { if (i < size) { buffer[i] = 0; } else { // Out of bounds write printf("Overflow at index %d\n", i); } } free(buffer); } int main() { // Triggering values that cause width * height * 4 to wrap around // 65536 * 65536 * 4 = 17179869184, which overflows 32-bit int printf("Testing CVE-2026-4985 Integer Overflow:\n"); cgif_addframe_vulnerable(65536, 65536); return 0; }

{"cve": {"id": "CVE-2026-4985", "sourceIdentifier": "[email protected]", "published": "2026-03-27T22:16:23.290", "lastModified": "2026-04-24T16:36:24.067", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was identified in dloebl CGIF up to 0.5.2. This vulnerability affects the function cgif_addframe of the file src/cgif.c of the component GIF Image Handler. The manipulation of the argument width/height leads to integer overflow. The attack may be initiated remotely. The identifier of the patch is b0ba830093f4317a5d1f345715d2fa3cd2dab474. It is suggested to install a patch to address this issue."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "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:X/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": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "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:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 1.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "baseScore": 5.0, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "NONE", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "PARTIAL"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 10.0, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-189"}, {"lang": "en", "value": "CWE-190"}]}], "references": [{"url": "https://github.com/dloebl/cgif/", "source": "[email protected]"}, {"url": "https://github.com/dloebl/cgif/commit/b0ba830093f4317a5d1f345715d2fa3cd2dab474", "source": "[email protected]"}, {"url": "https://github.com/dloebl/cgif/issues/110", "source": "[email protected]"}, {"url": "https://github.com/dloebl/cgif/pull/112", "source": "[email protected]"}, {"url": "https://vuldb.com/?ctiid.353874", "source": "[email protected]"}, {"url": "https://vuldb.com/?id.353874", "source": "[email protected]"}, {"url": "https://vuldb.com/?submit.778278", "source": "[email protected]"}]}}