FKIE_CVE-2026-14534
Vulnerability from fkie_nvd - Published: 2026-07-04 14:16 - Updated: 2026-07-06 18:55
Severity
Summary
Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules _posixsubprocess, site, and atexit in the UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist, fickling's check_safety() function returns LIKELY_SAFE with zero findings for pickle payloads that invoke dangerous functions including _posixsubprocess.fork_exec (C-level process spawner capable of executing arbitrary binaries), site.execsitecustomize (executes arbitrary site customization code), and atexit._run_exitfuncs (triggers all registered exit handler callbacks). The fickling.load() API chains check_safety() into pickle.loads() as an explicit security gate; a LIKELY_SAFE verdict causes the payload to be deserialized and executed. This shares the same root cause as CVE-2026-22607 (cProfile), CVE-2025-67748 (pty), and CVE-2025-67747 (marshal/types). OvertlyBadEvals does not flag these modules because they are standard library imports. UnsafeImports does not flag them because they are not in the denylist. The UnusedVariables heuristic is defeated by the SETITEMS opcode pattern.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://pypi.org/project/fickling/",
"defaultStatus": "unaffected",
"packageName": "fickling",
"product": "fickling",
"vendor": "trailofbits",
"versions": [
{
"lessThanOrEqual": "0.1.10",
"status": "affected",
"version": "0",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "0.1.11",
"versionType": "custom"
}
]
}
],
"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules _posixsubprocess, site, and atexit in the UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist, fickling\u0027s check_safety() function returns LIKELY_SAFE with zero findings for pickle payloads that invoke dangerous functions including _posixsubprocess.fork_exec (C-level process spawner capable of executing arbitrary binaries), site.execsitecustomize (executes arbitrary site customization code), and atexit._run_exitfuncs (triggers all registered exit handler callbacks). The fickling.load() API chains check_safety() into pickle.loads() as an explicit security gate; a LIKELY_SAFE verdict causes the payload to be deserialized and executed. This shares the same root cause as CVE-2026-22607 (cProfile), CVE-2025-67748 (pty), and CVE-2025-67747 (marshal/types). OvertlyBadEvals does not flag these modules because they are standard library imports. UnsafeImports does not flag them because they are not in the denylist. The UnusedVariables heuristic is defeated by the SETITEMS opcode pattern."
}
],
"id": "CVE-2026-14534",
"lastModified": "2026-07-06T18:55:20.287",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-14534",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-06T14:59:25.631510Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-04T14:16:28.400",
"references": [
{
"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082",
"url": "https://github.com/trailofbits/fickling/commit/e8408615b63adf034f891f653692ab9b51f0f5af"
},
{
"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082",
"url": "https://github.com/trailofbits/fickling/pull/272"
},
{
"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082",
"url": "https://github.com/trailofbits/fickling/releases/tag/v0.1.11"
},
{
"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082",
"url": "https://github.com/trailofbits/fickling/security/advisories/GHSA-m6fh-58r7-x697"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://github.com/trailofbits/fickling/security/advisories/GHSA-m6fh-58r7-x697"
}
],
"sourceIdentifier": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-184"
},
{
"lang": "en",
"value": "CWE-502"
}
],
"source": "aa17e1a1-c329-4d6e-a1ed-8d0188aea082",
"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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