{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-6100", "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22", "state": "PUBLISHED", "assignerShortName": "PSF", "dateReserved": "2026-04-10T21:13:45.428Z", "datePublished": "2026-04-13T17:15:47.606Z", "dateUpdated": "2026-08-13T00:27:12.761Z" }, "containers": { "cna": { "affected": [ { "defaultStatus": "unaffected", "product": "CPython", "repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "versions": [ { "version": "0", "lessThan": "3.10.21", "status": "affected", "versionType": "python" }, { "version": "3.11.0", "lessThan": "3.11.16", "status": "affected", "versionType": "python" }, { "version": "3.12.0", "lessThan": "3.12.14", "status": "affected", "versionType": "python" }, { "version": "3.13.0", "lessThan": "3.13.14", "status": "affected", "versionType": "python" }, { "version": "3.14.0a1", "lessThan": "3.14.5rc1", "status": "affected", "versionType": "python" }, { "version": "3.15.0a1", "lessThan": "3.15.0b1", "status": "affected", "versionType": "python" } ] } ], "credits": [ { "lang": "en", "type": "reporter", "value": "Ryan Hileman" }, { "lang": "en", "type": "remediation developer", "value": "Stan Ulbrych" }, { "lang": "en", "type": "coordinator", "value": "Seth Larson" }, { "lang": "en", "type": "finder", "value": "Stan Ulbrych" }, { "lang": "en", "type": "finder", "value": "Ryan Hileman" } ], "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the dangling pointer in this specific error condition.

The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable." } ], "value": "Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the dangling pointer in this specific error condition.\n\nThe vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable." } ], "metrics": [ { "cvssV4_0": { "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 9.1, "baseSeverity": "CRITICAL", "exploitMaturity": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-416", "description": "CWE-416 Use after free", "lang": "en", "type": "CWE" } ] }, { "descriptions": [ { "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds write", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "28c92f92-d60d-412d-b760-e73465c3df22", "shortName": "PSF", "dateUpdated": "2026-08-13T00:27:12.761Z" }, "references": [ { "tags": [ "patch" ], "url": "https://github.com/python/cpython/pull/148396" }, { "tags": [ "vendor-advisory" ], "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3/" }, { "tags": [ "issue-tracking" ], "url": "https://github.com/python/cpython/issues/148395" }, { "tags": [ "patch" ], "url": "https://github.com/python/cpython/commit/6a5f79c8d7bbf22b083b240910c7a8781a59437d" }, { "tags": [ "patch" ], "url": "https://github.com/python/cpython/commit/8fc66aef6d7b3ae58f43f5c66f9366cc8cbbfcd2" }, { "tags": [ "patch" ], "url": "https://github.com/python/cpython/commit/c3cf71c3366fe49acb776a639405c0eea6169c20" }, { "tags": [ "patch" ], "url": "https://github.com/python/cpython/commit/47128e64f98c3a20271138a98c2922bea2a3ee0e" }, { "tags": [ "patch" ], "url": "https://github.com/python/cpython/commit/e20c6c9667c99ecaab96e1a2b3767082841ffc8b" }, { "tags": [ "patch" ], "url": "https://github.com/python/cpython/commit/ea8d735eb084cf8cc021df1a30e90d10a8f052e3" } ], "source": { "discovery": "UNKNOWN" }, "title": "Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure", "x_generator": { "engine": "Vulnogram 0.6.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-04-13T19:21:03.412763Z", "id": "CVE-2026-6100", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { 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decompression modules, including `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile`. This vulnerability, a use-after-free, can occur if a program attempts to re-use a decompression object after a memory allocation error, especially when the system is experiencing high memory usage. Exploitation of this flaw could potentially allow an attacker to execute arbitrary code or access sensitive data. The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-825", "description": "Expired Pointer Dereference", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-6100" }, { "name": "RHBZ#2457932", "tags": [ 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Enterprise Linux BaseOS EUS (v.9.4)" }, { "lang": "en", "value": "RHSA-2026:14653: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4)" }, { "lang": "en", "value": "RHSA-2026:17525: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4)" }, { "lang": "en", "value": "RHSA-2026:19576: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6)" }, { "lang": "en", "value": "RHSA-2026:14652: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)" }, { "lang": "en", "value": "RHSA-2026:14656: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)" }, { "lang": "en", "value": "RHSA-2026:10949: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:10774: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:10745: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:19216: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:19175: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:19177: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:19176: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)" }, { "lang": "en", "value": "RHSA-2026:25096: Red Hat AI Inference Server 3.2" }, { "lang": "en", "value": "RHSA-2026:30078: Red Hat AI Inference Server 3.3" }, { "lang": "en", "value": "RHSA-2026:30089: Red Hat AI Inference Server 3.3" }, { "lang": "en", "value": "RHSA-2026:30088: Red Hat AI Inference Server 3.3" }, { "lang": "en", "value": "RHSA-2026:30087: Red Hat AI Inference Server 3.3" }, { "lang": "en", "value": "RHSA-2026:10140: Red Hat Enterprise Linux AI 3.3" }, { "lang": "en", "value": "RHSA-2026:10141: Red Hat Enterprise Linux AI 3.3" }, { "lang": "en", "value": "RHSA-2026:8822: Red Hat Hardened Images" }, { "lang": "en", "value": "RHSA-2026:8824: Red Hat Hardened Images" }, { "lang": "en", "value": "RHSA-2026:10117: Red Hat Hardened Images" }, { "lang": "en", "value": "RHSA-2026:9228: Red Hat Hardened Images" }, { "lang": "en", "value": "RHSA-2026:11768: Red Hat Update Infrastructure 5" }, { "lang": "en", "value": "RHSA-2026:21275: Red Hat Update Infrastructure 5" } ], "timeline": [ { "lang": "en", "time": "2026-04-13T18:01:31.970Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-04-13T17:15:47.606Z", "value": "Made public." } ], "title": "python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules", "workarounds": [ { "lang": "en", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-08-10T12:05:45.968Z" } } ] } }