CVE-2026-1285

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{"affected": [{"affectedData": [{"collectionURL": "https://pypi.org/project/Django/", "defaultStatus": "unaffected", "packageName": "django", "product": "Django", "repo": "https://github.com/django/django/", "vendor": "djangoproject", "versions": [{"lessThan": "6.0.2", "status": "affected", "version": "6.0", "versionType": "semver"}, {"status": "unaffected", "version": "6.0.2", "versionType": "semver"}, {"lessThan": "5.2.11", "status": "affected", "version": "5.2", "versionType": "semver"}, {"status": "unaffected", "version": "5.2.11", "versionType": "semver"}, {"lessThan": "4.2.28", "status": "affected", "version": "4.2", "versionType": "semver"}, {"status": "unaffected", "version": "4.2.28", "versionType": "semver"}]}], "source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*", "matchCriteriaId": "59566A1F-D2C5-43D6-97AA-258EFD90B937", "versionEndExcluding": "4.2.28", "versionStartIncluding": "4.2", "vulnerable": true}, {"criteria": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*", "matchCriteriaId": "845BC013-1341-4D81-A5F1-507C814ABA7E", "versionEndExcluding": "5.2.11", "versionStartIncluding": "5.2", "vulnerable": true}, {"criteria": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*", "matchCriteriaId": "4ACBCB7B-B8F4-4EEF-842D-0CCB8674BCD2", "versionEndExcluding": "6.0.2", "versionStartIncluding": "6.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28.\n`django.utils.text.Truncator.chars()` and `Truncator.words()` methods (with `html=True`) and the `truncatechars_html` and `truncatewords_html` template filters allow a remote attacker to cause a potential denial-of-service via crafted inputs containing a large number of unmatched HTML end tags.\nEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\nDjango would like to thank Seokchan Yoon for reporting this issue."}, {"lang": "es", "value": "Se descubri\u00f3 un problema en 6.0 anterior a 6.0.2, 5.2 anterior a 5.2.11 y 4.2 anterior a 4.2.28.\nLos m\u00e9todos 'django.utils.text.Truncator.chars()' y 'Truncator.words()' (con 'html=True') y los filtros de plantilla 'truncatechars_html' y 'truncatewords_html' permiten a un atacante remoto causar una potencial denegaci\u00f3n de servicio mediante entradas manipuladas que contienen un gran n\u00famero de etiquetas de cierre HTML no coincidentes.\nSeries de Django anteriores y sin soporte (como 5.0.x, 4.1.x y 3.2.x) no fueron evaluadas y tambi\u00e9n pueden verse afectadas.\nDjango desea agradecer a Seokchan Yoon por informar de este problema."}], "id": "CVE-2026-1285", "lastModified": "2026-06-17T10:15:27.220", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-1285", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-03T16:22:30.293747Z", "version": "2.0.3"}}]}, "published": "2026-02-03T15:16:13.570", "references": [{"source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92", "tags": ["Patch", "Vendor Advisory"], "url": "https://docs.djangoproject.com/en/dev/releases/security/"}, {"source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92", "tags": ["Release Notes"], "url": "https://groups.google.com/g/django-announce"}, {"source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92", "tags": ["Patch", "Vendor Advisory"], "url": "https://www.djangoproject.com/weblog/2026/feb/03/security-releases/"}], "sourceIdentifier": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92", "type": "Secondary"}]}

{"bugzilla": {"description": "Django: Django: Denial of Service via crafted HTML inputs", "id": "2436340", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436340"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in Django. A remote attacker can exploit this vulnerability by providing crafted inputs containing a large number of unmatched HTML end tags to the `django.utils.text.Truncator.chars()` and `Truncator.words()` methods (when `html=True`), or through the `truncatechars_html` and `truncatewords_html` template filters. This can lead to a denial-of-service (DoS) condition, making the application unavailable to legitimate users."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, applications utilizing Django should avoid processing untrusted HTML content through the `django.utils.text.Truncator.chars()` and `Truncator.words()` methods with `html=True`, or the `truncatechars_html` and `truncatewords_html` template filters. Restrict the use of these functions to only trusted inputs where the HTML structure is controlled and validated."}, "name": "CVE-2026-1285", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform-24/de-minimal-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform-24/de-minimal-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-24/lightspeed-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform-25/de-minimal-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform-25/de-minimal-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-25/lightspeed-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform-26/de-minimal-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-26/lightspeed-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "automation-controller", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:discovery:2::el9", "fix_state": "Affected", "package_name": "discovery/discovery-server-rhel9", "product_name": "Red Hat Discovery 2"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "satellite/iop-advisor-backend-rhel9", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-02-03T14:35:50Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-1285\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-1285\nhttps://docs.djangoproject.com/en/dev/releases/security/\nhttps://groups.google.com/g/django-announce\nhttps://www.djangoproject.com/weblog/2026/feb/03/security-releases/"], "statement": "This is a MODERATE impact denial-of-service flaw in Django. Applications utilizing Django that process untrusted HTML inputs with a large number of unmatched end tags through the `Truncator.chars()` or `Truncator.words()` methods (with `html=True`), or the `truncatechars_html` and `truncatewords_html` template filters, may experience resource exhaustion. This can lead to the application becoming unavailable.", "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-18T00:22:02.151444+00:00", "value": {"mitigation_remediation": ["Upgrade Django to version 6.0.2, 5.2.11, or 4.2.28 or later to incorporate the fixed logic.", "If an upgrade cannot be performed immediately, eliminate the use of Truncator methods or the truncatechars_html and truncatewords_html filters wherever possible to prevent the vulnerability from being triggered.", "Implement input validation that rejects or sanitizes payloads containing an excessive number of unmatched HTML end tags, reducing the chance of resource exhaustion."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The issue affects the Django framework. Versions 6.0 prior to 6.0.2, 5.2 prior to 5.2.11, and 4.2 prior to 4.2.28 are vulnerable. Older Django series such as 5.0.x, 4.1.x, and 3.2.x were not examined but may also be affected.", "description_and_impact": "An attacker can trigger a denial\u2011of\u2011service condition by submitting data that contains a large number of unmatched HTML end tags to Django\u2019s truncation utilities when the html flag is enabled. The vulnerability is rooted in resource exhaustion; operations that parse the malformed HTML can consume excessive memory, leading to high CPU usage or crashes. This flaw is categorized as CWE\u2011407 (Excessive Resource Consumption) and CWE\u2011770 (Uncontrolled Memory Allocation).", "risk_and_exploitability": "The CVSS score is 7.5, indicating a high severity. While the EPSS score is below 1%, meaning that the probability of exploitation has historically been low, the lack of a KEV listing does not mitigate the risk. Exploitation requires an attacker to supply crafted input to an endpoint using Truncator.chars(), Truncator.words(), or the corresponding template filters with html=True. Successfully leveraged, the attacker can cause the target application to consume excessive resources and potentially become unavailable, though remote code execution is not supported."}}}}, "created": "2026-02-04T12:09:21.459478+00:00", "updated": "2026-04-18T00:30:25.709500+00:00", "vendors": ["djangoproject", "djangoproject$PRODUCT$django"]}