CVE-2025-1936

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{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "128.*", "status": "unaffected", "version": "128.8", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "136", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "128.*", "status": "unaffected", "version": "128.8", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "136", "versionType": "rpm"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "51A0498A-4BF8-4166-A347-78023C0A6B33", "versionEndExcluding": "128.8.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "matchCriteriaId": "0FD416E8-4DD8-434A-AD75-86F38562E720", "versionEndExcluding": "136.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "D3C5A2B6-C7B5-4888-B0A7-9DA0C3024C71", "versionEndExcluding": "128.8.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "93C81C9D-FC2E-4D7D-A97F-8DB97ED92192", "versionEndExcluding": "136.0", "versionStartIncluding": "129.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it was ignored when retrieving the content from the archive, but the fake extension after the null was used to determine the type of content. This could have been used to hide code in a web extension disguised as something else like an image. This vulnerability was fixed in Firefox 136, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8."}, {"lang": "es", "value": "jar: las URL recuperan el contenido de un archivo local empaquetado en un archivo ZIP. El valor null y todo lo que le sigue se ignoran al recuperar el contenido del archivo, pero la extensi\u00f3n falsa que sigue al valor null se utiliza para determinar el tipo de contenido. Esto podr\u00eda haberse utilizado para ocultar c\u00f3digo en una extensi\u00f3n web camuflada en otra cosa, como una imagen. Esta vulnerabilidad afecta a Firefox menor que 136, Firefox ESR menor que 128.8, Thunderbird menor que 136 y Thunderbird menor que 128.8."}], "id": "CVE-2025-1936", "lastModified": "2026-10-05T15:10:00.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-1936", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-03-25T17:55:09.593793Z", "version": "2.0.3"}}]}, "published": "2025-03-04T14:15:38.500", "references": [{"source": "security@mozilla.org", "tags": ["Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1940027"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-14/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-16/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-17/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-18/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-158"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:2699", "cpe": "cpe:/o:redhat:rhel_els:7", "package": "firefox-0:128.8.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "release_date": "2025-03-13T00:00:00Z"}, {"advisory": "RHSA-2025:2452", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:128.8.0-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-03-06T00:00:00Z"}, {"advisory": "RHSA-2025:2708", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "firefox-0:128.8.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2025-03-13T00:00:00Z"}, {"advisory": "RHSA-2025:2484", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "firefox-0:128.8.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2484", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "firefox-0:128.8.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2484", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "firefox-0:128.8.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2485", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "firefox-0:128.8.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2485", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "firefox-0:128.8.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2485", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "firefox-0:128.8.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2486", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "firefox-0:128.8.0-1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2359", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "firefox-0:128.8.0-1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-03-05T00:00:00Z"}, {"advisory": "RHSA-2025:2481", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "firefox-0:128.8.0-1.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2480", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "firefox-0:128.8.0-1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2479", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "firefox-0:128.8.0-1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-03-10T00:00:00Z"}], "bugzilla": {"description": "firefox: Adding %00 and a fake extension to a jar: URL changed the interpretation of the contents", "id": "2349797", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2349797"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "status": "verified"}, "cwe": "CWE-754", "details": ["jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it was ignored when retrieving the content from the archive, but the fake extension after the null was used to determine the type of content. This could have been used to hide code in a web extension disguised as something else like an image. This vulnerability affects Firefox < 136, Firefox ESR < 128.8, Thunderbird < 136, and Thunderbird < 128.8."], "name": "CVE-2025-1936", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-03-04T13:31:26Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-1936\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-1936\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=1940027\nhttps://www.mozilla.org/security/advisories/mfsa2025-14/\nhttps://www.mozilla.org/security/advisories/mfsa2025-16/"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-20T18:22:07.746143+00:00", "value": {"mitigation_remediation": ["Update Mozilla Firefox to version 136 or later, or ESR 128.8, and update Mozilla Thunderbird to version 136 or later, or ESR 128.8.", "If an update cannot be performed immediately, avoid using jar: URLs and review the source of any extensions that rely on jar: protocol, removing or disabling them until patching is performed.", "Validate and audit any third\u2011party extensions for unexpected hidden files or unusual MIME type declarations before installation."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox prior to version\u202f136 (or ESR\u202f128.8) and Mozilla Thunderbird prior to version\u202f136 (or ESR\u202f128.8) are affected. The issue arises when a browser loads a jar: URL from a web extension or other source. Operating systems such as Red\u202fHat Enterprise\u202fLinux, though listed as CPEs, are not directly impacted unless they run the affected browsers. Systems using the affected browser versions should upgrade to the patched releases to eliminate the vulnerability.", "description_and_impact": "jar: URLs are used to retrieve local file content packaged in a ZIP archive. The vulnerability lies in the interpretation of null bytes and the following fake extension: when a jar URL contains a null byte followed by a fake extension, the null byte and the following content are ignored when retrieving the archive, but the fake extension is used to determine the type of content. This allows malicious code to be concealed inside a file that appears to be an image or other benign content, enabling the code to be executed by the browser as part of a web extension. The impact is the ability for an attacker to execute arbitrary code within the browser context or through a malicious extension, potentially compromising the confidentiality, integrity, or availability of the user\u2019s system.", "risk_and_exploitability": "With a CVSS score of 7.3 the vulnerability is classified as high severity. The EPSS score of less than 1\u202f% indicates a low probability of exploitation, and the vulnerability is not yet recorded in the CISA KEV catalog. Exploitation requires the attacker to supply a jar: URL that contains a null byte followed by a fake extension, typically within the context of a malicious or compromised web extension. The attacker must have the ability to deliver or install that extension, so the attack surface is limited to users who install extensions or visit sites that can define such URLs. While the risk is not trivial, the likelihood of widespread exploitation remains low under the current conditions."}}}}, "created": "2026-04-20T18:30:13.978970+00:00", "updated": "2026-04-20T18:30:13.978985+00:00", "vendors": []}