FKIE_CVE-2026-6100
Vulnerability from fkie_nvd - Published: 2026-04-13 18:16 - Updated: 2026-07-15 01:16
Severity
Summary
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "CPython",
"repo": "https://github.com/python/cpython",
"vendor": "Python Software Foundation",
"versions": [
{
"lessThan": "3.13.14",
"status": "affected",
"version": "0",
"versionType": "python"
},
{
"lessThan": "3.14.5rc1",
"status": "affected",
"version": "3.14.0a1",
"versionType": "python"
},
{
"lessThan": "3.15.0b1",
"status": "affected",
"version": "3.15.0a1",
"versionType": "python"
}
]
}
],
"source": "cna@python.org"
},
{
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"cpes": [
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"cpe:/o:redhat:enterprise_linux:10.2"
],
"defaultStatus": "affected",
"packageName": "python3.12",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:3.12.12-3.el10_1.3",
"versionType": "rpm"
},
{
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"status": "unaffected",
"version": "0:3.12.13-2.el10_2",
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}
]
},
{
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"cpes": [
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],
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"packageName": "python3.14",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:3.14.4-2.el10_2",
"versionType": "rpm"
}
]
},
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"cpes": [
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],
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"packageName": "python3.12",
"product": "Red Hat Enterprise Linux 10.0 Extended Update Support",
"vendor": "Red Hat",
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{
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"versionType": "rpm"
}
]
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"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
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{
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"version": "0:3.12.13-2.el8_10",
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"cpes": [
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"packageName": "python3.11",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
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"version": "0:3.11.13-7.el8_10",
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"packageName": "python3",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
"versions": [
{
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"version": "0:3.6.8-76.el8_10",
"versionType": "rpm"
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{
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"cpes": [
"cpe:/a:redhat:rhel_aus:8.4"
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"defaultStatus": "affected",
"packageName": "python3",
"product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:3.6.8-39.el8_4.11",
"versionType": "rpm"
}
]
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{
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"cpes": [
"cpe:/a:redhat:rhel_eus_long_life:8.4"
],
"defaultStatus": "affected",
"packageName": "python3",
"product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
"vendor": "Red Hat",
"versions": [
{
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"versionType": "rpm"
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{
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"cpes": [
"cpe:/a:redhat:rhel_aus:8.6"
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"packageName": "python3",
"product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:3.6.8-47.el8_6.13",
"versionType": "rpm"
}
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},
{
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"cpes": [
"cpe:/a:redhat:rhel_tus:8.6"
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"packageName": "python3",
"product": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service",
"vendor": "Red Hat",
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{
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"versionType": "rpm"
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"cpes": [
"cpe:/a:redhat:rhel_e4s:8.6"
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"packageName": "python3",
"product": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
"vendor": "Red Hat",
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{
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"versionType": "rpm"
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"packageName": "python3",
"product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:3.6.8-51.el8_8.15",
"versionType": "rpm"
}
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"product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
"vendor": "Red Hat",
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"versionType": "rpm"
}
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"cpes": [
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"packageName": "python3",
"product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
"vendor": "Red Hat",
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"vendor": "Red Hat",
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"version": "0:3.11.2-2.el8_8.10",
"versionType": "rpm"
}
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{
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"cpes": [
"cpe:/a:redhat:enterprise_linux:9"
],
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"packageName": "python3.12",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:3.12.12-4.el9_7.3",
"versionType": "rpm"
},
{
"lessThan": "*",
"status": "unaffected",
"version": "0:3.12.13-2.el9_8",
"versionType": "rpm"
}
]
},
{
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"cpes": [
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"packageName": "python3.11",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "0:3.11.13-5.3.el9_7",
"versionType": "rpm"
},
{
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"version": "0:3.11.13-9.el9_8",
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{
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"cpes": [
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"cpe:/o:redhat:enterprise_linux:9"
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"defaultStatus": "affected",
"packageName": "python3.9",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
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"packageName": "python3.14",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
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"cpes": [
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"packageName": "python3.9",
"product": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
"vendor": "Red Hat",
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{
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"versionType": "rpm"
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{
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"cpes": [
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"packageName": "python3.11",
"product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
"vendor": "Red Hat",
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{
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"cpes": [
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"packageName": "python3.9",
"product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
"vendor": "Red Hat",
"versions": [
{
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"cpes": [
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"packageName": "python3.12",
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"packageName": "python3.9",
"product": "Red Hat Enterprise Linux 9.4 Extended Update Support",
"vendor": "Red Hat",
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},
{
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"cpes": [
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"vendor": "Red Hat",
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},
{
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"packageName": "python3.12",
"product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
"vendor": "Red Hat",
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{
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"packageName": "python3.9",
"product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
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"versionType": "rpm"
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},
{
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"cpes": [
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],
"defaultStatus": "affected",
"packageName": "rhpam-7/rhpam-businesscentral-monitoring-rhel8",
"product": "RHEL-8 based Middleware Containers",
"vendor": "Red Hat",
"versions": [
{
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},
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"packageName": "rhpam-7/rhpam-businesscentral-rhel8",
"product": "RHEL-8 based Middleware Containers",
"vendor": "Red Hat",
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"packageName": "rhpam-7/rhpam-controller-rhel8",
"product": "RHEL-8 based Middleware Containers",
"vendor": "Red Hat",
"versions": [
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"product": "RHEL-8 based Middleware Containers",
"vendor": "Red Hat",
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"vendor": "Red Hat",
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"packageName": "rhaiis/vllm-cuda-rhel9",
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"vendor": "Red Hat",
"versions": [
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"versions": [
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},
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"product": "Red Hat Enterprise Linux AI 3.3",
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"versions": [
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"url": "https://access.redhat.com/errata/RHSA-2026:8822"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:8824"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:9228"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/security/cve/CVE-2026-6100"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457932"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6100.json"
}
],
"sourceIdentifier": "cna@python.org",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
},
{
"lang": "en",
"value": "CWE-787"
}
],
"source": "cna@python.org",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-825"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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