certfr_avis - certfr-2026-avi-0430

CERTFR-2026-AVI-0430

Vulnerability from certfr_avis

De multiples vulnérabilités ont été découvertes dans Python. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance et un problème de sécurité non spécifié par l'éditeur.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description
	Python	CPython	CPython sans les derniers correctifs de sécurité

References

Title

Publication Time

Tags

Bulletin de sécurité Python JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5	2026-04-13	vendor-advisory
Bulletin de sécurité Python HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3	2026-04-13	vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "CPython sans les derniers correctifs de s\u00e9curit\u00e9",
      "product": {
        "name": "CPython",
        "vendor": {
          "name": "Python",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-6100",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-6100"
    },
    {
      "name": "CVE-2026-4786",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-4786"
    }
  ],
  "initial_release_date": "2026-04-14T00:00:00",
  "last_revision_date": "2026-04-14T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0430",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-04-14T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "Ex\u00e9cution de code arbitraire \u00e0 distance"
    },
    {
      "description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Python. Elles permettent \u00e0 un attaquant de provoquer une ex\u00e9cution de code arbitraire \u00e0 distance et un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans Python",
  "vendor_advisories": [
    {
      "published_at": "2026-04-13",
      "title": "Bulletin de s\u00e9curit\u00e9 Python JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/"
    },
    {
      "published_at": "2026-04-13",
      "title": "Bulletin de s\u00e9curit\u00e9 Python HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3/"
    }
  ]
}

CVE-2026-6100 (GCVE-0-2026-6100)

Vulnerability from cvelistv5

Published

2026-04-13 17:15

Modified

2026-04-14 14:30

Severity ?

9.1 (Critical) - 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

CWE

CWE-416 - Use after free
CWE-787 - Out-of-bounds write

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

URL

Tags

	https://github.com/python/cpython/pull/148396	patch
	https://mail.python.org/archives/list/security-announce@python.org/thread/HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3/	vendor-advisory
	https://github.com/python/cpython/issues/148395	issue-tracking
	https://github.com/python/cpython/commit/6a5f79c8d7bbf22b083b240910c7a8781a59437d	patch
	https://github.com/python/cpython/commit/8fc66aef6d7b3ae58f43f5c66f9366cc8cbbfcd2	patch
	https://github.com/python/cpython/commit/c3cf71c3366fe49acb776a639405c0eea6169c20	patch
	https://github.com/python/cpython/commit/47128e64f98c3a20271138a98c2922bea2a3ee0e	patch
	https://github.com/python/cpython/commit/e20c6c9667c99ecaab96e1a2b3767082841ffc8b	patch

Impacted products

	Vendor	Product	Version
	Python Software Foundation	CPython	Version: 0

Show details on NVD website

JSON

To clipboard

{
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    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-6100",
                "options": [
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                  {
                    "Technical Impact": "total"
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                "timestamp": "2026-04-13T19:21:03.412763Z",
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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        "providerMetadata": {
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            "url": "http://www.openwall.com/lists/oss-security/2026/04/13/10"
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          "product": "CPython",
          "repo": "https://github.com/python/cpython",
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          "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.\u003cbr\u003e\u003cbr\u003eThe 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": [
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          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
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            "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",
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          "descriptions": [
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              "cweId": "CWE-416",
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              "lang": "en",
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            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787 Out-of-bounds write",
              "lang": "en",
              "type": "CWE"
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          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-04-14T14:30:25.622Z",
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      "references": [
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          "url": "https://github.com/python/cpython/pull/148396"
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          "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3/"
        },
        {
          "tags": [
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          "url": "https://github.com/python/cpython/issues/148395"
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        {
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          "url": "https://github.com/python/cpython/commit/47128e64f98c3a20271138a98c2922bea2a3ee0e"
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      },
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    "dateUpdated": "2026-04-14T14:30:25.622Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-4786 (GCVE-0-2026-4786)

Vulnerability from cvelistv5

Published

2026-04-13 21:52

Modified

2026-04-14 14:30

Severity ?

7.0 (High) - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CWE

CWE-77

Summary

Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

References

URL

Tags

	https://github.com/python/cpython/pull/148170	patch
	https://github.com/python/cpython/issues/148169	issue-tracking
	https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/	vendor-advisory
	https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca	patch
	https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff	patch
	https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769	patch

Impacted products

	Vendor	Product	Version
	Python Software Foundation	CPython	Version: 0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-4786",
                "options": [
                  {
                    "Exploitation": "none"
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-14T13:43:47.712946Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-04-14T13:43:54.704Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "product": "CPython",
          "repo": "https://github.com/python/cpython",
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          "type": "remediation developer",
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          "supportingMedia": [
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              "value": "Mitgation of\u0026nbsp;CVE-2026-4519 was incomplete. If the URL contained \"%action\" the mitigation could be bypassed for certain browser types the \"webbrowser.open()\" API could have commands injected into the underlying shell. See\u0026nbsp;CVE-2026-4519 for details."
            }
          ],
          "value": "Mitgation of\u00a0CVE-2026-4519 was incomplete. If the URL contained \"%action\" the mitigation could be bypassed for certain browser types the \"webbrowser.open()\" API could have commands injected into the underlying shell. See\u00a0CVE-2026-4519 for details."
        }
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      "metrics": [
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            "attackVector": "LOCAL",
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}

Tags

Taxonomy of the tags.

All sightings related to this event Export sightings related to this event

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

CERTFR-2026-AVI-0430

Vulnerability from certfr_avis

Solutions

CVE-2026-6100 (GCVE-0-2026-6100)

Vulnerability from cvelistv5

CVE-2026-4786 (GCVE-0-2026-4786)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature