CVE-2025-27516 (GCVE-0-2025-27516)

Vulnerability from cvelistv5 – Published: 2025-03-05 20:40 – Updated: 2026-02-26 19:09
VLAI
Title
Jinja sandbox breakout through attr filter selecting format method
Summary
Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code. To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates. Jinja's sandbox does catch calls to str.format and ensures they don't escape the sandbox. However, it's possible to use the |attr filter to get a reference to a string's plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment's attribute lookup. This vulnerability is fixed in 3.1.6.
Severity
5.4 (Medium)
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Assigner
References
Impacted products
Vendor Product Version
pallets jinja Affected: < 3.1.6
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-27516",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-07-31T03:56:03.356670Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-26T19:09:45.280Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T19:45:35.548Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/04/msg00045.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/04/msg00022.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "jinja",
          "vendor": "pallets",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.1.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code. To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates. Jinja\u0027s sandbox does catch calls to str.format and ensures they don\u0027t escape the sandbox. However, it\u0027s possible to use the |attr filter to get a reference to a string\u0027s plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment\u0027s attribute lookup. This vulnerability is fixed in 3.1.6."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1336",
              "description": "CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-03-05T20:40:06.568Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pallets/jinja/security/advisories/GHSA-cpwx-vrp4-4pq7",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pallets/jinja/security/advisories/GHSA-cpwx-vrp4-4pq7"
        },
        {
          "name": "https://github.com/pallets/jinja/commit/90457bbf33b8662926ae65cdde4c4c32e756e403",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pallets/jinja/commit/90457bbf33b8662926ae65cdde4c4c32e756e403"
        }
      ],
      "source": {
        "advisory": "GHSA-cpwx-vrp4-4pq7",
        "discovery": "UNKNOWN"
      },
      "title": "Jinja sandbox breakout through attr filter selecting format method"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-27516",
    "datePublished": "2025-03-05T20:40:06.568Z",
    "dateReserved": "2025-02-26T18:11:52.307Z",
    "dateUpdated": "2026-02-26T19:09:45.280Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-27516",
      "date": "2026-08-07",
      "epss": "0.00497",
      "percentile": "0.39967"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-27516\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2025-03-05T21:15:20.073\",\"lastModified\":\"2026-06-17T09:03:44.560\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code. To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates. Jinja\u0027s sandbox does catch calls to str.format and ensures they don\u0027t escape the sandbox. However, it\u0027s possible to use the |attr filter to get a reference to a string\u0027s plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment\u0027s attribute lookup. This vulnerability is fixed in 3.1.6.\"},{\"lang\":\"es\",\"value\":\"Jinja es un motor de plantillas extensible. Antes de la versi\u00f3n 3.1.6, un descuido en la forma en que el entorno aislado de Jinja interact\u00faa con el filtro |attr permite que un atacante que controla el contenido de una plantilla ejecute c\u00f3digo Python arbitrario. Para explotar la vulnerabilidad, un atacante debe controlar el contenido de una plantilla. Si ese es el caso depende del tipo de aplicaci\u00f3n que utilice Jinja. Esta vulnerabilidad afecta a los usuarios de aplicaciones que ejecutan plantillas no confiables. El entorno aislado de Jinja detecta las llamadas a str.format y garantiza que no escapen del entorno aislado. Sin embargo, es posible utilizar el filtro |attr para obtener una referencia al m\u00e9todo de formato simple de una cadena, sin pasar por el entorno aislado. Despu\u00e9s de la correcci\u00f3n, el filtro |attr ya no pasa por alto la b\u00fasqueda de atributos del entorno. Esta vulnerabilidad se corrigi\u00f3 en la versi\u00f3n 3.1.6.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"pallets\",\"product\":\"jinja\",\"versions\":[{\"version\":\"\u003c 3.1.6\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/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\",\"baseScore\":5.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"PASSIVE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-07-31T03:56:03.356670Z\",\"id\":\"CVE-2025-27516\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-1336\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:palletsprojects:jinja:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"3.1.6\",\"matchCriteriaId\":\"331B4BEB-27DD-4593-AB42-5A218EFA4526\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://github.com/pallets/jinja/commit/90457bbf33b8662926ae65cdde4c4c32e756e403\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/pallets/jinja/security/advisories/GHSA-cpwx-vrp4-4pq7\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/04/msg00022.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/04/msg00045.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-07T13:27:28+00:00",
      "cve": "CVE-2025-27516",
      "id": "CVE-2025-27516",
      "initial_release_date": "2025-03-05T20:40:06.568000+00:00",
      "product_status:fixed": "1015",
      "product_status:known_affected": "19",
      "product_status:known_not_affected": "2406",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "jinja2: Jinja sandbox breakout through attr filter selecting format method",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-27516.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/04/msg00045.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/04/msg00022.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T19:45:35.548Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-27516\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-07-31T03:56:03.356670Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-03-05T20:53:36.247Z\"}}], \"cna\": {\"title\": \"Jinja sandbox breakout through attr filter selecting format method\", \"source\": {\"advisory\": \"GHSA-cpwx-vrp4-4pq7\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 5.4, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N\", \"userInteraction\": \"PASSIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"LOW\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"pallets\", \"product\": \"jinja\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 3.1.6\"}]}], \"references\": [{\"url\": \"https://github.com/pallets/jinja/security/advisories/GHSA-cpwx-vrp4-4pq7\", \"name\": \"https://github.com/pallets/jinja/security/advisories/GHSA-cpwx-vrp4-4pq7\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/pallets/jinja/commit/90457bbf33b8662926ae65cdde4c4c32e756e403\", \"name\": \"https://github.com/pallets/jinja/commit/90457bbf33b8662926ae65cdde4c4c32e756e403\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter allows an attacker that controls the content of a template to execute arbitrary Python code. To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates. Jinja\u0027s sandbox does catch calls to str.format and ensures they don\u0027t escape the sandbox. However, it\u0027s possible to use the |attr filter to get a reference to a string\u0027s plain format method, bypassing the sandbox. After the fix, the |attr filter no longer bypasses the environment\u0027s attribute lookup. This vulnerability is fixed in 3.1.6.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1336\", \"description\": \"CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2025-03-05T20:40:06.568Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-27516\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-26T19:09:45.280Z\", \"dateReserved\": \"2025-02-26T18:11:52.307Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2025-03-05T20:40:06.568Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.