CVE-2026-27888

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{"bugzilla": {"description": "pypdf: pypdf: Denial of Service via crafted PDF", "id": "2442899", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442899"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-1050", "details": ["pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.", "A flaw was found in pypdf. A remote attacker can exploit this vulnerability by crafting a malicious PDF document. When a user processes this specially crafted PDF, it can lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected system. This issue specifically arises when the `xfa` property of a PDF reader or writer is accessed and its corresponding stream is compressed using `/FlateDecode`."], "name": "CVE-2026-27888", "package_state": [{"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-ocp-rag-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-service-api-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/disk-image-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-llama-stack-core-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-02-26T00:42:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-27888\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27888\nhttps://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c\nhttps://github.com/py-pdf/pypdf/pull/3658\nhttps://github.com/py-pdf/pypdf/releases/tag/6.7.3\nhttps://github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.7.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "pypdf", "source": "cna", "vendor": "py-pdf"}, "product": "pypdf", "vendor": "py-pdf"}], "analysis": {"en": {"generated_at": "2026-04-18T17:37:53.160502+00:00", "value": {"mitigation_remediation": ["Upgrade pypdf to version\u202f6.7.3 or later to obtain the official fix.", "If an upgrade is not immediately feasible, apply the manual patch from commit\u202f7a4c8246ed48d9d328fb596942271da47b6d109c to correct FlateDecode handling in XFA streams.", "Adjust application logic to avoid accessing the xfa property on untrusted PDFs, and implement input validation or resource\u2011usage limits to detect abnormal memory consumption."], "summary": {"action": "Apply Patch", "impact": "Resource Exhaustion (Denial of Service)"}, "threat_synthesis": {"affected_systems": "All releases of the pypdf library older than version\u202f6.7.3 are vulnerable. The project is py\u2011pdf:pypdf, and the fix was introduced in release\u202f6.7.3. Any deployment that imports and uses pypdf before that version and accesses the xfa property on PDFs is affected.", "description_and_impact": "An attacker can craft a PDF that, when processed by a program using the pypdf library, causes the library to allocate an unusually large amount of memory by exploiting the handling of an XFA stream compressed with /FlateDecode. The flaw is triggered when the code accesses the xfa property of a Reader or Writer, leading to a memory\u2011management error (CWE\u20111050) and a resource\u2011exhaustion vulnerability (CWE\u2011400). The result is exhaustion of RAM, a process crash, and a denial of service; there is no evidence of arbitrary code execution or data leakage.", "risk_and_exploitability": "The CVSS base score of 6.6 indicates a moderate level of severity, and the EPSS score of less than\u202f1\u202f% denotes a low likelihood of this exploit appearing in the wild. The vulnerability is not listed in the CISA KEV catalog. A flaw is exercised when malicious PDF content is loaded and the xfa property is accessed, which is a typical path for document parsing or form\u2011processing applications that use pypdf. Consequently, an attacker who can supply such a PDF to a vulnerable application may cause a denial of service through memory exhaustion."}}}}, "created": "2026-02-26T13:10:17.847934+00:00", "updated": "2026-04-18T17:45:06.057796+00:00", "vendors": ["py-pdf", "py-pdf$PRODUCT$pypdf"]}