CVE-2026-41992

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-41992", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-04-23T08:06:09.511Z", "datePublished": "2026-06-29T10:15:57.278Z", "dateUpdated": "2026-08-27T11:39:40.630Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-08-27T11:39:40.630Z"}, "title": "Global Buffer Overflow in GNU gzip", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-126", "description": "CWE-126: Buffer Over-read", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-540", "descriptions": [{"lang": "en", "value": "CAPEC-540: Overread Buffers"}]}], "affected": [{"vendor": "GNU", "product": "gzip", "repo": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/", "modules": ["unlzh.c (LZH decompressor)", "unlzw.c (LZW decompressor)", "gzip.c (shared global state)"], "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "1.14", "versionType": "custom"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:gnu:gzip:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndIncluding": "1.14"}]}]}], "descriptions": [{"lang": "en", "value": "GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation.\nBy decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out\u2011of\u2011bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer.\n\nThis issue has been fixed in commits 63dbf6b3b9e6e781df1a6a64e609b10e23969681 and\u00a0e7378c2d421be6a286922374425680bbe9ad8b7d.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation.<br>By decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out\u2011of\u2011bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer.<br><br>This issue has been fixed in commits 63dbf6b3b9e6e781df1a6a64e609b10e23969681 and<span>&nbsp;e7378c2d421be6a286922374425680bbe9ad8b7d.</span>"}]}], "tags": ["x_open-source"], "references": [{"url": "https://cert.pl/en/posts/2026/04/CVE-2026-41991/", "tags": ["third-party-advisory"]}, {"url": "https://www.gnu.org/software/gzip/", "tags": ["product"]}, {"url": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=63dbf6b3b9e6e781df1a6a64e609b10e23969681", "tags": ["patch"]}, {"url": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=e7378c2d421be6a286922374425680bbe9ad8b7d", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.9, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "Micha\u0142 Majchrowicz (AFINE)", "type": "finder"}, {"lang": "en", "value": "Marcin Wyczechowski (AFINE)", "type": "finder"}, {"lang": "en", "value": "Elias Hasas (@zer0d4y5)", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-29T13:30:31.933225Z", "id": "CVE-2026-41992", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-29T13:30:43.882Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/08/23/1"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/25/1"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/27/2"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-08-27T06:04:57.422Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/08/23/1"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/25/1"}, {"url": "http://www.openwall.com/lists/oss-security/2026/08/27/2"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-08-27T06:04:57.422Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-41992", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-29T13:30:31.933225Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-29T13:30:38.923Z"}}], "cna": {"tags": ["x_open-source"], "title": "Global Buffer Overflow in GNU gzip", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Micha\u0142 Majchrowicz (AFINE)"}, {"lang": "en", "type": "finder", "value": "Marcin Wyczechowski (AFINE)"}, {"lang": "en", "type": "finder", "value": "Elias Hasas (@zer0d4y5)"}], "impacts": [{"capecId": "CAPEC-540", "descriptions": [{"lang": "en", "value": "CAPEC-540: Overread Buffers"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/", "vendor": "GNU", "modules": ["unlzh.c (LZH decompressor)", "unlzw.c (LZW decompressor)", "gzip.c (shared global state)"], "product": "gzip", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "1.14"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://cert.pl/en/posts/2026/04/CVE-2026-41991/", "tags": ["third-party-advisory"]}, {"url": "https://www.gnu.org/software/gzip/", "tags": ["product"]}, {"url": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=63dbf6b3b9e6e781df1a6a64e609b10e23969681", "tags": ["patch"]}, {"url": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=e7378c2d421be6a286922374425680bbe9ad8b7d", "tags": ["patch"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation.\nBy decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out\u2011of\u2011bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer.\n\nThis issue has been fixed in commits 63dbf6b3b9e6e781df1a6a64e609b10e23969681 and\u00a0e7378c2d421be6a286922374425680bbe9ad8b7d.", "supportingMedia": [{"type": "text/html", "value": "GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation.<br>By decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out\u2011of\u2011bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer.<br><br>This issue has been fixed in commits 63dbf6b3b9e6e781df1a6a64e609b10e23969681 and<span>&nbsp;e7378c2d421be6a286922374425680bbe9ad8b7d.</span>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-126", "description": "CWE-126: Buffer Over-read"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:gnu:gzip:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndIncluding": "1.14", "versionStartIncluding": "0"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-08-27T11:39:40.630Z"}}}, "cveMetadata": {"cveId": "CVE-2026-41992", "state": "PUBLISHED", "dateUpdated": "2026-08-27T11:39:40.630Z", "dateReserved": "2026-04-23T08:06:09.511Z", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "datePublished": "2026-06-29T10:15:57.278Z", "assignerShortName": "CERT-PL"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["unlzh.c (LZH decompressor)", "unlzw.c (LZW decompressor)", "gzip.c (shared global state)"], "product": "gzip", "repo": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/", "vendor": "GNU", "versions": [{"lessThanOrEqual": "1.14", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "cvd@cert.pl"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:gnu:gzip:*:*:*:*:*:*:*:*", "matchCriteriaId": "FA344ACC-4D0B-42F2-BED0-04561F842EA1", "versionEndIncluding": "1.14", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation.\nBy decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out\u2011of\u2011bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer.\n\nThis issue has been fixed in commits 63dbf6b3b9e6e781df1a6a64e609b10e23969681 and\u00a0e7378c2d421be6a286922374425680bbe9ad8b7d."}, {"lang": "es", "value": "GNU gzip contiene una vulnerabilidad global de desbordamiento de b\u00fafer en la l\u00f3gica de descompresi\u00f3n LZH causada por la reutilizaci\u00f3n inadecuada de un estado global compartido entre diferentes formatos de descompresi\u00f3n dentro de una \u00fanica ejecuci\u00f3n. GNU gzip mantiene una matriz global que se comparte entre las rutinas de descompresi\u00f3n LZ77, LZW y LZH y no se reinicializa entre archivos procesados en la misma invocaci\u00f3n.\nAl descomprimir un archivo LZW especialmente dise\u00f1ado seguido de un archivo LZH especialmente dise\u00f1ado en un \u00fanico comando gzip -d, un atacante puede envenenar el estado global compartido y posteriormente desencadenar una lectura fuera de l\u00edmites en el decodificador LZH. La l\u00f3gica de descompresi\u00f3n LZH sigue valores obsoletos dejados en la matriz compartida, causando lecturas m\u00e1s all\u00e1 del final del b\u00fafer global asignado.\n\nEste problema ha sido solucionado en el commit 63dbf6b3b9e6e781df1a6a64e609b10e23969681"}], "id": "CVE-2026-41992", "lastModified": "2026-10-25T21:10:00.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cvd@cert.pl", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-41992", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-29T13:30:31.933225Z", "version": "2.0.3"}}]}, "published": "2026-06-29T12:16:29.940", "references": [{"source": "cvd@cert.pl", "tags": ["Broken Link"], "url": "https://cert.pl/en/posts/2026/04/CVE-2026-41991/"}, {"source": "cvd@cert.pl", "tags": ["Patch"], "url": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=63dbf6b3b9e6e781df1a6a64e609b10e23969681"}, {"source": "cvd@cert.pl", "url": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=e7378c2d421be6a286922374425680bbe9ad8b7d"}, {"source": "cvd@cert.pl", "tags": ["Product"], "url": "https://www.gnu.org/software/gzip/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/23/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/25/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/27/2"}], "sourceIdentifier": "cvd@cert.pl", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-126"}], "source": "cvd@cert.pl", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.14]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "gzip", "source": "cna", "vendor": "GNU"}, "product": "gzip", "vendor": "gnu"}], "created": "2026-06-29T14:00:05.014951+00:00", "updated": "2026-08-27T15:30:04.656167+00:00", "vendors": ["gnu", "gnu$PRODUCT$gzip"]}