CVE-2026-4539

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{"bugzilla": {"description": "pygments: Pygments: Denial of Service via inefficient regular expression processing in AdlLexer", "id": "2450066", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450066"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in pygments. A local user can exploit this vulnerability by providing specially crafted input to the AdlLexer function, which leads to inefficient regular expression processing. 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"rhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-agent-installer-api-server-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift4/ose-olm-catalogd-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/foreman-mcp-server-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite/iop-advisor-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-host-inventory-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite/iop-insights-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-puptoo-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vmaas-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vulnerability-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Out of support scope", "package_name": "rhtas/model-transparency-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}], "public_date": "2026-03-22T05:35:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4539\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4539\nhttps://github.com/pygments/pygments/\nhttps://github.com/pygments/pygments/issues/3058\nhttps://vuldb.com/?ctiid.352327\nhttps://vuldb.com/?id.352327\nhttps://vuldb.com/?submit.774685"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.19.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.19.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.19.2"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "pygments", "source": "cna", "vendor": "n/a"}, "product": "pygments", "vendor": "pygments"}], "analysis": {"en": {"generated_at": "2026-03-22T07:50:17.851475+00:00", "value": {"mitigation_remediation": ["Check the Pygments project page or PyPI for a patched release and upgrade to a version that addresses the AdlLexer regular\u2011expression flaw.", "If a patched release is not yet available, restrict the use of AdlLexer to only trusted inputs or disable its use entirely in the application.", "Monitor the project's issue tracker and security advisories for updates and apply any new patches promptly."], "summary": {"action": "Upgrade", "impact": "Denial of Service (Resource Exhaustion)"}, "threat_synthesis": {"affected_systems": "Pygments versions up to and including 2.19.2 are affected. The library is an open\u2011source Python package that can be imported by any project. Any environment that utilizes the AdlLexer in its tokenization process is at risk, regardless of vendor distribution.", "description_and_impact": "A regular expression in Pygments\u2019 AdlLexer can be engineered to consume excessive processing time, causing the application that processes the input to hang or crash. The vulnerability results in uncontrolled resource consumption, which degrades or halts service availability. It does not lead to data disclosure, tampering, or privilege escalation.", "risk_and_exploitability": "The CVSS score of 4.8 indicates moderate severity, and no EPSS score is available. The issue is not listed in the CISA KEV catalog. Exploitation requires local access to an application that imports Pygments, so the attack vector is local. The public exploit demonstrates that a malicious input can trigger the denial\u2011of\u2011service condition, but it does not compromise confidentiality or integrity."}}}}, "created": "2026-03-23T09:46:37.712569+00:00", "updated": "2026-03-25T14:46:37.330863+00:00", "vendors": ["pygments", "pygments$PRODUCT$pygments"]}