Vulnerability-Lookup

RHSA-2026:57660

Vulnerability from csaf_redhat - Published: 2026-08-20 18:45 - Updated: 2026-08-23 02:54

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: python3.11: * python3.11-3.11.16-1.hum1 (aarch64, x86_64) * python3.11-debug-3.11.16-1.hum1 (aarch64, x86_64) * python3.11-devel-3.11.16-1.hum1 (aarch64, x86_64) * python3.11-idle-3.11.16-1.hum1 (aarch64, x86_64) * python3.11-libs-3.11.16-1.hum1 (aarch64, x86_64) * python3.11-test-3.11.16-1.hum1 (aarch64, x86_64) * python3.11-tkinter-3.11.16-1.hum1 (aarch64, x86_64) * python3.11-3.11.16-1.hum1.src (src) Security Fix(es): python3.11: * CVE-2026-3479 * CVE-2026-6019

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-3479

A flaw was found in Python's `pkgutil.get_data()` function, which is used to retrieve data from packages. This function did not properly validate the `resource` argument, allowing a local attacker to perform path traversal attacks. Path traversal enables an attacker to access files and directories stored outside the intended root directory, potentially leading to information disclosure or unintended file access.

3.3 (Low)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:python3-11-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-11-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-11-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Low

CVE-2026-6019

A flaw was found in Python's `http.cookies` module. The `Morsel.js_output()` function, responsible for generating JavaScript output for cookies, does not properly neutralize the `</script>` HTML sequence. This oversight could allow a remote attacker to inject malicious script into a web page, potentially leading to Cross-Site Scripting (XSS) attacks. Such an attack could result in information disclosure or arbitrary code execution within the user's browser.

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:python3-11-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-11-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-11-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

CVE-2026-18503

A flaw was found in the `csv.Sniffer.sniff()` function within Python. An attacker can exploit this by providing specially crafted CSV samples, which can trigger super-linear regular-expression processing during dialect sniffing. This excessive processing consumes significant CPU resources, potentially leading to a Denial of Service (DoS) for applications that process unbounded input using this function.

2.8 (Low)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

CWE-1333 - Inefficient Regular Expression Complexity

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:python3-11-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-11-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-11-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Low

References

29 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:57660	self
https://access.redhat.com/security/cve/CVE-2026-3479	external
https://access.redhat.com/security/cve/CVE-2026-6019	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://access.redhat.com/security/cve/CVE-2026-18503	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-3479	self
https://bugzilla.redhat.com/show_bug.cgi?id=2448746	external
https://www.cve.org/CVERecord?id=CVE-2026-3479	external
https://nvd.nist.gov/vuln/detail/CVE-2026-3479	external
https://github.com/python/cpython/issues/146121	external
https://github.com/python/cpython/pull/146122	external
https://mail.python.org/archives/list/security-an…	external
https://access.redhat.com/security/cve/CVE-2026-6019	self
https://bugzilla.redhat.com/show_bug.cgi?id=2460869	external
https://www.cve.org/CVERecord?id=CVE-2026-6019	external
https://nvd.nist.gov/vuln/detail/CVE-2026-6019	external
https://github.com/python/cpython/commit/76b3923d…	external
https://github.com/python/cpython/issues/90309	external
https://github.com/python/cpython/pull/148848	external
https://mail.python.org/archives/list/security-an…	external
https://access.redhat.com/security/cve/CVE-2026-18503	self
https://bugzilla.redhat.com/show_bug.cgi?id=2513510	external
https://www.cve.org/CVERecord?id=CVE-2026-18503	external
https://nvd.nist.gov/vuln/detail/CVE-2026-18503	external
https://github.com/python/cpython/issues/98820	external
https://github.com/python/cpython/pull/153694	external
https://mail.python.org/archives/list/security-an…	external

JSON

To clipboard

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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
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            "Red Hat Hardened Images:python3-11-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "python: Python: Cross-Site Scripting (XSS) vulnerability in http.cookies module"
    },
    {
      "cve": "CVE-2026-18503",
      "cwe": {
        "id": "CWE-1333",
        "name": "Inefficient Regular Expression Complexity"
      },
      "discovery_date": "2026-08-10T14:11:09.811226+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2513510"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `csv.Sniffer.sniff()` function within Python. An attacker can exploit this by providing specially crafted CSV samples, which can trigger super-linear regular-expression processing during dialect sniffing. This excessive processing consumes significant CPU resources, potentially leading to a Denial of Service (DoS) for applications that process unbounded input using this function.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "python: Python: Denial of Service via super-linear regular expression work in csv.Sniffer.sniff()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat has evaluated this issue and determined it has a Low security impact. The csv.Sniffer.sniff() function in Python\u0027s standard library is vulnerable to excessive CPU consumption when processing specially crafted CSV input, due to quadratic time complexity in the dialect sniffing regex. Most applications are not affected as they use csv.reader() or csv.DictReader() directly without invoking the sniffing functionality.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-18503"
        },
        {
          "category": "external",
          "summary": "RHBZ#2513510",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513510"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-18503",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-18503"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-18503",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18503"
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        {
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          "summary": "https://github.com/python/cpython/issues/98820",
          "url": "https://github.com/python/cpython/issues/98820"
        },
        {
          "category": "external",
          "summary": "https://github.com/python/cpython/pull/153694",
          "url": "https://github.com/python/cpython/pull/153694"
        },
        {
          "category": "external",
          "summary": "https://mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/",
          "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/"
        }
      ],
      "release_date": "2026-08-10T13:45:31.618000+00:00",
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        {
          "category": "vendor_fix",
          "date": "2026-08-20T18:45:29+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:python3-11-main@aarch64",
            "Red Hat Hardened Images:python3-11-main@src",
            "Red Hat Hardened Images:python3-11-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:57660"
        },
        {
          "category": "workaround",
          "details": "Do not pass untrusted or unbounded CSV input to csv.Sniffer.sniff(). If dialect detection is needed, limit the size of the sample passed to sniff() or use a known dialect directly with csv.reader().",
          "product_ids": [
            "Red Hat Hardened Images:python3-11-main@aarch64",
            "Red Hat Hardened Images:python3-11-main@src",
            "Red Hat Hardened Images:python3-11-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
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            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:python3-11-main@aarch64",
            "Red Hat Hardened Images:python3-11-main@src",
            "Red Hat Hardened Images:python3-11-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "python: Python: Denial of Service via super-linear regular expression work in csv.Sniffer.sniff()"
    }
  ]
}

CVE-2026-18503 (GCVE-0-2026-18503)

Vulnerability from cvelistv5 – Published: 2026-08-10 13:45 – Updated: 2026-08-13 00:28

Title

Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()

Summary

Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and consume significant CPU when applications pass unbounded input to csv.Sniffer.sniff().

Severity

2.4 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-10 17:56 UTC

CWE

CWE-1176

Assigner

PSF mitre root

References

9 references

URL	Tags
https://mail.python.org/archives/list/security-an…	vendor-advisory
https://github.com/python/cpython/pull/153694	patch
https://github.com/python/cpython/issues/98820	issue-tracking
https://github.com/python/cpython/commit/063d4555…	patch
https://github.com/python/cpython/commit/476fb09c…	patch
https://github.com/python/cpython/commit/89f29c76…	patch
https://github.com/python/cpython/commit/b30c7fa9…	patch
https://github.com/python/cpython/commit/b09a67a2…	patch
https://github.com/python/cpython/commit/fd78b565…	patch

Impacted products

1 product

Vendor	Product	Version
Python Software Foundation	CPython	Affected: 0 , < 3.10.21 (python) Affected: 3.11.0 , < 3.11.16 (python) Affected: 3.12.0 , < 3.12.14 (python) Affected: 3.13.0 , < 3.13.15 (python) Affected: 3.14.0 , < 3.14.7 (python) Affected: 3.15.0a1 , < 3.15.0rc1 (python)

Credits

Serhiy Storchaka (https://github.com/serhiy-storchaka) Jack Desert (https://github.com/jackdesert) Sean Gilligan (https://github.com/sg3-141-592) Seth Larson (https://github.com/sethmlarson)

Show details on NVD website

JSON

To clipboard

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CVE-2026-3479 (GCVE-0-2026-3479)

Vulnerability from cvelistv5 – Published: 2026-03-18 18:13 – Updated: 2026-04-07 22:01 Disputed

Title

pkgutil.get_data() does not enforce documented restrictions

Summary

DISPUTED: The project has clarified that the documentation was incorrect, and that pkgutil.get_data() has the same security model as open(). The documentation has been updated to clarify this point. There is no vulnerability in the function if following the intended security model. pkgutil.get_data() did not validate the resource argument as documented, allowing path traversals.

Severity

0 (None)


                        
                          CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-18 18:50 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

PSF mitre root

References

7 references

URL	Tags
https://github.com/python/cpython/pull/146122	patch
https://mail.python.org/archives/list/security-an…	vendor-advisory
https://github.com/python/cpython/issues/146121	issue-tracking
https://github.com/python/cpython/commit/bcdf2319…	patch
https://github.com/python/cpython/commit/5af6ce3e…	patch
https://github.com/python/cpython/commit/cf59bf76…	patch
https://github.com/python/cpython/commit/d786d59a…	patch

Impacted products

1 product

Vendor	Product	Version
Python Software Foundation	CPython	Affected: 0 , < 3.13.13 (python) Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python)

Show details on NVD website

JSON

To clipboard

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CVE-2026-6019 (GCVE-0-2026-6019)

Vulnerability from cvelistv5 – Published: 2026-04-22 19:28 – Updated: 2026-06-10 18:58

Title

BaseCookie.js_output() does not neutralize embedded characters

Summary

http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 20:02 UTC

CWE

CWE-150 - Improper neutralization of escape, meta, or control sequences

Assigner

PSF mitre root

References

6 references

URL	Tags
https://github.com/python/cpython/pull/148848	patch
https://github.com/python/cpython/issues/90309	issue-tracking
https://mail.python.org/archives/list/security-an…	vendor-advisory
https://github.com/python/cpython/commit/76b3923d…	patch
https://github.com/python/cpython/commit/3c59b8b5…	patch
https://github.com/python/cpython/commit/f795e042…	patch

Impacted products

1 product

Vendor	Product	Version
Python Software Foundation	CPython	Affected: 0 , < 3.13.14 (python) Affected: 3.14.0a1 , < 3.14.5rc1 (python) Affected: 3.15.0a1 , < 3.15.0b1 (python)

Credits

oolongeya (https://github.com/komi22) Seth Larson (https://github.com/sethmlarson)

Show details on NVD website

JSON

To clipboard

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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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

RHSA-2026:57660

CVE-2026-18503 (GCVE-0-2026-18503)

CVE-2026-3479 (GCVE-0-2026-3479)

CVE-2026-6019 (GCVE-0-2026-6019)

Tags

Sightings

Nomenclature