CVE-2026-55601

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55601", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-16T23:18:03.170Z", "datePublished": "2026-10-13T19:13:31.325Z", "dateUpdated": "2026-10-13T20:02:24.721Z"}, "containers": {"cna": {"title": "MultiTail: Shell injection in execute-on-match command handling", "problemTypes": [{"descriptions": [{"cweId": "CWE-78", "lang": "en", "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h"}, {"name": "https://github.com/folkertvanheusden/multitail/issues/56", "tags": ["x_refsource_MISC"], "url": "https://github.com/folkertvanheusden/multitail/issues/56"}, {"name": "https://github.com/folkertvanheusden/multitail/commit/84f304e140261034e33796bab81e9bf4f09d153c", "tags": ["x_refsource_MISC"], "url": "https://github.com/folkertvanheusden/multitail/commit/84f304e140261034e33796bab81e9bf4f09d153c"}], "affected": [{"vendor": "folkertvanheusden", "product": "multitail", "versions": [{"version": "<= 7.1.5", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-13T19:13:31.325Z"}, "descriptions": [{"lang": "en", "value": "MultiTail is a utility for monitoring multiple log files in one terminal. In version 7.1.5 and earlier, the -ex and -eX execute-on-match feature appended attacker-controlled matched input to a configured command inside double quotes, then check_filter_exec() in mt.c passed the constructed command through execute_program() in exec.c to sh -c. Partial escaping left shell metacharacters such as command substitution active, allowing an attacker who could influence monitored input to execute commands as the user running MultiTail. No fixed release is available as of this review."}], "source": {"advisory": "GHSA-54vm-wwx8-856h", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-13T20:02:02.281948Z", "id": "CVE-2026-55601", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-13T20:02:24.721Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55601", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-13T20:02:02.281948Z"}}}], "references": [{"url": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-13T20:02:19.718Z"}}], "cna": {"title": "MultiTail: Shell injection in execute-on-match command handling", "source": {"advisory": "GHSA-54vm-wwx8-856h", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.3, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "folkertvanheusden", "product": "multitail", "versions": [{"status": "affected", "version": "<= 7.1.5"}]}], "references": [{"url": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h", "name": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/folkertvanheusden/multitail/issues/56", "name": "https://github.com/folkertvanheusden/multitail/issues/56", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/folkertvanheusden/multitail/commit/84f304e140261034e33796bab81e9bf4f09d153c", "name": "https://github.com/folkertvanheusden/multitail/commit/84f304e140261034e33796bab81e9bf4f09d153c", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "MultiTail is a utility for monitoring multiple log files in one terminal. In version 7.1.5 and earlier, the -ex and -eX execute-on-match feature appended attacker-controlled matched input to a configured command inside double quotes, then check_filter_exec() in mt.c passed the constructed command through execute_program() in exec.c to sh -c. Partial escaping left shell metacharacters such as command substitution active, allowing an attacker who could influence monitored input to execute commands as the user running MultiTail. No fixed release is available as of this review."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-78", "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-13T19:13:31.325Z"}}}, "cveMetadata": {"cveId": "CVE-2026-55601", "state": "PUBLISHED", "dateUpdated": "2026-10-13T20:02:24.721Z", "dateReserved": "2026-06-16T23:18:03.170Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-10-13T19:13:31.325Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "multitail", "vendor": "folkertvanheusden", "versions": [{"status": "affected", "version": "<= 7.1.5"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "MultiTail is a utility for monitoring multiple log files in one terminal. In version 7.1.5 and earlier, the -ex and -eX execute-on-match feature appended attacker-controlled matched input to a configured command inside double quotes, then check_filter_exec() in mt.c passed the constructed command through execute_program() in exec.c to sh -c. Partial escaping left shell metacharacters such as command substitution active, allowing an attacker who could influence monitored input to execute commands as the user running MultiTail. No fixed release is available as of this review."}], "id": "CVE-2026-55601", "lastModified": "2026-10-16T20:04:29.760", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55601", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-13T20:02:02.281948Z", "version": "2.0.3"}}]}, "published": "2026-10-13T20:17:29.477", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/folkertvanheusden/multitail/commit/84f304e140261034e33796bab81e9bf4f09d153c"}, {"source": "security-advisories@github.com", "url": "https://github.com/folkertvanheusden/multitail/issues/56"}, {"source": "security-advisories@github.com", "url": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "multitail: multitail: Arbitrary command execution via improper input escaping in execute-on-match feature", "id": "2551789", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2551789"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-78", "details": ["MultiTail is a utility for monitoring multiple log files in one terminal. In version 7.1.5 and earlier, the -ex and -eX execute-on-match feature appended attacker-controlled matched input to a configured command inside double quotes, then check_filter_exec() in mt.c passed the constructed command through execute_program() in exec.c to sh -c. Partial escaping left shell metacharacters such as command substitution active, allowing an attacker who could influence monitored input to execute commands as the user running MultiTail. No fixed release is available as of this review.", "A flaw was found in MultiTail. When using the execute-on-match feature, MultiTail fails to properly sanitize matched log data before passing it to the system shell for command execution. An attacker capable of influencing the contents of monitored input can exploit this issue by injecting shell metacharacters, resulting in arbitrary command execution with the privileges of the user running MultiTail."], "mitigation": {"lang": "en:us", "value": "Avoid using the `-ex` or `-eX` command-line options to execute commands on matching regular expressions when inspecting log files or streams that untrusted users can write to. Additionally, verify that configuration files such as `/etc/multitail.conf` and `~/.multitailrc` do not define automated command execution actions for untrusted sources.\nCaveats: Disabling or avoiding these parameters prevents automated script execution when log patterns match."}, "name": "CVE-2026-55601", "public_date": "2026-10-13T19:13:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-55601\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-55601\nhttps://github.com/folkertvanheusden/multitail/commit/84f304e140261034e33796bab81e9bf4f09d153c\nhttps://github.com/folkertvanheusden/multitail/issues/56\nhttps://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h"], "statement": "This vulnerability is rated as having Important impact because an attacker capable of injecting content into monitored log streams can achieve arbitrary shell execution under the privileges of the active session. Exploitation requires non-default execute-on-match options or configuration directives to be invoked against inputs that process untrusted data. Furthermore, multitail is not part of core Red Hat Enterprise Linux and is only distributed through EPEL and Fedora community channels.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.1.5]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "multitail", "source": "cna", "vendor": "folkertvanheusden"}, "product": "multitail", "vendor": "folkertvanheusden"}], "created": "2026-10-14T13:00:13.997288+00:00", "updated": "2026-10-19T13:09:58.731311+00:00", "vendors": ["folkertvanheusden", "folkertvanheusden$PRODUCT$multitail"]}