CVE-2026-25556

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The function accepts a caller-owned fz_pixmap pointer but incorrectly drops the pixmap in its error handling path before rethrowing the exception. Callers (including the barcode decoding path in fz_decode_barcode_from_display_list) also drop the same pixmap in cleanup, resulting in a double-free that can corrupt the heap and crash the process. This issue affects applications that enable and use MuPDF barcode decoding and can be triggered by processing crafted input that causes a rendering-time error while decoding barcodes."}, {"lang": "es", "value": "Las versiones de MuPDF 1.23.0 a 1.27.0 contienen una vulnerabilidad de doble liberaci\u00f3n en fz_fill_pixmap_from_display_list() cuando ocurre una excepci\u00f3n durante la renderizaci\u00f3n de la lista de visualizaci\u00f3n. La funci\u00f3n acepta un puntero fz_pixmap propiedad del llamador, pero libera incorrectamente el pixmap en su ruta de manejo de errores antes de relanzar la excepci\u00f3n. Los llamadores (incluida la ruta de decodificaci\u00f3n de c\u00f3digos de barras en fz_decode_barcode_from_display_list) tambi\u00e9n liberan el mismo pixmap en la limpieza, lo que resulta en una doble liberaci\u00f3n que puede corromper el heap y bloquear el proceso. Este problema afecta a las aplicaciones que habilitan y utilizan la decodificaci\u00f3n de c\u00f3digos de barras de MuPDF y puede ser activado al procesar una entrada manipulada que causa un error en tiempo de renderizaci\u00f3n mientras se decodifican c\u00f3digos de barras."}], "id": "CVE-2026-25556", "lastModified": "2026-07-14T16:16:53.830", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-25556", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-06T16:34:46.909949Z", "version": "2.0.3"}}]}, "published": "2026-02-06T17:16:27.387", "references": [{"source": "disclosure@vulncheck.com", "tags": ["Exploit", "Issue Tracking"], "url": "https://bugs.ghostscript.com/show_bug.cgi?id=709029"}, {"source": "disclosure@vulncheck.com", "tags": ["Patch"], "url": "https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=d4743b6092d513321c23c6f7fe5cff87cde043c1"}, {"source": "disclosure@vulncheck.com", "tags": ["Product"], "url": "https://mupdf.com/"}, {"source": "disclosure@vulncheck.com", "tags": ["Third Party Advisory"], "url": "https://www.vulncheck.com/advisories/mupdf-barcode-decoding-double-free"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{"bugzilla": {"description": "MuPDF: MuPDF: Denial of Service via crafted input during barcode decoding", "id": "2437835", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2437835"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-763", "details": ["MuPDF versions 1.23.0 through 1.27.0 contain a double-free vulnerability in fz_fill_pixmap_from_display_list() when an exception occurs during display list rendering. The function accepts a caller-owned fz_pixmap pointer but incorrectly drops the pixmap in its error handling path before rethrowing the exception. Callers (including the barcode decoding path in fz_decode_barcode_from_display_list) also drop the same pixmap in cleanup, resulting in a double-free that can corrupt the heap and crash the process. This issue affects applications that enable and use MuPDF barcode decoding and can be triggered by processing crafted input that causes a rendering-time error while decoding barcodes.", "A flaw was found in MuPDF. An attacker can exploit a double-free vulnerability in the `fz_fill_pixmap_from_display_list()` function by processing crafted input that causes a rendering-time error during barcode decoding. This can lead to heap corruption and a process crash, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid processing untrusted or unverified input with applications that use MuPDF for barcode decoding. Restricting the sources of documents processed by MuPDF can reduce the risk of exploitation."}, "name": "CVE-2026-25556", "public_date": "2026-02-06T16:11:59Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-25556\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-25556\nhttps://bugs.ghostscript.com/show_bug.cgi?id=709029\nhttps://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=d4743b6092d513321c23c6f7fe5cff87cde043c1\nhttps://mupdf.com/\nhttps://www.vulncheck.com/advisories/mupdf-barcode-decoding-double-free"], "statement": "This MODERATE impact vulnerability in MuPDF affects applications that utilize its barcode decoding functionality. The flaw can be triggered when processing specially crafted input that causes a rendering error during barcode decoding, leading to a double-free and potential application crash. Red Hat products are affected if they enable and use MuPDF for barcode decoding.", "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-16T17:24:32.857558+00:00", "value": {"mitigation_remediation": ["Upgrade MuPDF to version 1.28 or later, which contains the patch for the double\u2011free bug.", "If an upgrade is not immediately possible, disable or remove the barcode decoding feature from the MuPDF integration until a patch is applied.", "Run MuPDF in a sandboxed or restricted environment and validate input files before rendering to limit the impact of any additional memory\u2011corruption vulnerabilities."], "summary": {"action": "Patch MuPDF immediately", "impact": "Heap corruption due to a double\u2011free that can crash the process"}, "threat_synthesis": {"affected_systems": "MuPDF, a PDF and XPS rendering engine from Artifex Software, is affected for all releases from 1.23.0 up to and including 1.27.0. Applications that enable MuPDF barcode decoding and process user documents are therefore impacted.", "description_and_impact": "The vulnerability arises in MuPDF versions 1.23.0 through 1.27.0 when an exception occurs during display list rendering while processing a barcode. The function fz_fill_pixmap_from_display_list incorrectly frees a caller\u2011owned pixmap in its error path, and the caller later frees the same pixmap in cleanup, producing a double\u2011free. This flaw allows heap corruption and can terminate the application.", "risk_and_exploitability": "The CVSS score is 5.9 and the EPSS score is under 1\u202f%, indicating a low likelihood of active exploitation. The flaw is not listed in the CISA KEV catalog. An attacker can trigger the issue by delivering a specially crafted document that causes a rendering-time error during barcode decoding. This results in a deterministic heap corruption that usually crashes the process, affecting availability and potentially enabling further exploitation if additional vulnerabilities exist. The primary attack vector therefore requires the attacker to supply malicious content to a MuPDF\u2011using application."}}}}, "created": "2026-02-09T10:50:37.017709+00:00", "updated": "2026-04-16T17:30:26.012478+00:00", "vendors": ["artifex", "artifex$PRODUCT$mupdf"]}