CVE-2026-103923

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{"affected": [{"affectedData": [{"product": "KaTeX", "vendor": "KaTeX", "versions": [{"status": "affected", "version": ">= 0.11.0, < 0.18.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web. From 0.11.0 until 0.18.2, KaTeX uses ordinary JavaScript property access for the renderer options object, the trust setting, default and processor setting metadata, and namespace lookup and group restoration, allowing inherited properties to be treated as explicitly supplied values. When Object.prototype is already polluted or an attacker controls the options object's prototype, attacker-controlled mathematical expressions can use an inherited trust value to enable trusted rendering and produce links capable of user-interaction cross-site scripting or loading attacker-selected external resources in a consuming application that inserts unsanitized KaTeX output into a page. KaTeX does not itself create the prototype pollution, and rendering an expression alone does not execute script. This issue is fixed in version 0.18.2."}], "id": "CVE-2026-103923", "lastModified": "2026-10-06T02:17:02.757", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "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": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-103923", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-06T01:59:19.477369Z", "version": "2.0.3"}}]}, "published": "2026-10-01T18:17:13.053", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/KaTeX/KaTeX/commit/0adf7e77db6915d991803b29699f82b1ccf8d4f4"}, {"source": "security-advisories@github.com", "url": "https://github.com/KaTeX/KaTeX/pull/4260"}, {"source": "security-advisories@github.com", "url": "https://github.com/KaTeX/KaTeX/releases/tag/v0.18.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/KaTeX/KaTeX/security/advisories/GHSA-238p-pmpm-9mq7"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-807"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "katex: katex: Cross-site scripting via prototype pollution inheritance", "id": "2544876", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544876"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-79", "details": ["A flaw was found in KaTeX. When JavaScript prototype pollution is present or an attacker can manipulate configuration prototypes, KaTeX improperly relies on inherited properties instead of strictly validated configuration options. A remote attacker submitting crafted mathematical expressions can exploit this behavior to bypass trust restrictions, leading to cross-site scripting (XSS) or the loading of unauthorized external resources in web applications that display unsanitized output."], "name": "CVE-2026-103923", "package_state": [{"cpe": "cpe:/a:redhat:podman_desktop:1", "fix_state": "Fix deferred", "package_name": "rh-podman-desktop", "product_name": "Red Hat Build of Podman Desktop"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "openshell", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Fix deferred", "package_name": "devspaces/code-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}], "public_date": "2026-10-01T17:37:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-103923\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-103923\nhttps://github.com/KaTeX/KaTeX/commit/0adf7e77db6915d991803b29699f82b1ccf8d4f4\nhttps://github.com/KaTeX/KaTeX/pull/4260\nhttps://github.com/KaTeX/KaTeX/releases/tag/v0.18.2\nhttps://github.com/KaTeX/KaTeX/security/advisories/GHSA-238p-pmpm-9mq7"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.11.0,0.18.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "KaTeX", "source": "cna", "vendor": "KaTeX"}, "product": "katex", "vendor": "katex"}], "created": "2026-10-01T19:00:16.368507+00:00", "updated": "2026-10-02T14:30:24.038993+00:00", "vendors": ["katex", "katex$PRODUCT$katex"]}