Vulnerability-Lookup

RHSA-2026:71658

Vulnerability from csaf_redhat - Published: 2026-09-24 18:35 - Updated: 2026-09-24 21:51

Summary

Red Hat Security Advisory: python-cryptography security update

Severity

Important

Notes

Topic: An update for python-cryptography is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * python-cryptography: python-cryptography: Duplicate self-signed intermediates can cause exponential path-building (CVE-2026-69249) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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-2026-69249

A flaw was found in python-cryptography. When processing invalid certificate chains that include duplicate self-signed certificates, the system recursively invokes the same certificate, leading to an exponential increase in processing time. A remote attacker could exploit this by providing a specially crafted certificate chain, causing resource exhaustion and a denial of service (DoS) condition, making the system unavailable. The integrity of the system's validation is not affected, only its availability.

7.5 (High)


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

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: BaseOS-10.2.Z:python-cryptography-0:43.0.0-4.el10_2.5.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python-cryptography-debugsource-0:43.0.0-4.el10_2.5.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python-cryptography-debugsource-0:43.0.0-4.el10_2.5.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python-cryptography-debugsource-0:43.0.0-4.el10_2.5.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python-cryptography-debugsource-0:43.0.0-4.el10_2.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python3-cryptography-0:43.0.0-4.el10_2.5.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python3-cryptography-0:43.0.0-4.el10_2.5.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python3-cryptography-0:43.0.0-4.el10_2.5.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python3-cryptography-0:43.0.0-4.el10_2.5.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:71658	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2510815	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-69249	self
https://bugzilla.redhat.com/show_bug.cgi?id=2510815	external
https://www.cve.org/CVERecord?id=CVE-2026-69249	external
https://nvd.nist.gov/vuln/detail/CVE-2026-69249	external
https://github.com/pyca/cryptography/commit/4a12c…	external
https://github.com/pyca/cryptography/pull/14960	external
https://github.com/pyca/cryptography/security/adv…	external

JSON

To clipboard

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      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)",
          "product_id": "BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.x86_64"
        },
        "product_reference": "python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.x86_64",
        "relates_to_product_reference": "BaseOS-10.2.Z"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-69249",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2026-08-03T22:01:50.119035+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2510815"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in python-cryptography. When processing invalid certificate chains that include duplicate self-signed certificates, the system recursively invokes the same certificate, leading to an exponential increase in processing time. A remote attacker could exploit this by providing a specially crafted certificate chain, causing resource exhaustion and a denial of service (DoS) condition, making the system unavailable. The integrity of the system\u0027s validation is not affected, only its availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "python-cryptography: python-cryptography: Duplicate self-signed intermediates can cause exponential path-building",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this Important (CVSS 3.1 7.5). Duplicate self-signed intermediates can make PolicyBuilder path-building take seconds per request. GitHub CNA CVSS 4.0 is 8.7.",
          "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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          "BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-69249"
        },
        {
          "category": "external",
          "summary": "RHBZ#2510815",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510815"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-69249",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-69249"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-69249",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-69249"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyca/cryptography/commit/4a12cf49675a184e47f912b00b04f3a629283582",
          "url": "https://github.com/pyca/cryptography/commit/4a12cf49675a184e47f912b00b04f3a629283582"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyca/cryptography/pull/14960",
          "url": "https://github.com/pyca/cryptography/pull/14960"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyca/cryptography/security/advisories/GHSA-jwv3-5hgf-82ww",
          "url": "https://github.com/pyca/cryptography/security/advisories/GHSA-jwv3-5hgf-82ww"
        }
      ],
      "release_date": "2026-08-03T21:26:45.826000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-24T18:35:33+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "BaseOS-10.2.Z:python-cryptography-0:43.0.0-4.el10_2.5.src",
            "BaseOS-10.2.Z:python-cryptography-debugsource-0:43.0.0-4.el10_2.5.aarch64",
            "BaseOS-10.2.Z:python-cryptography-debugsource-0:43.0.0-4.el10_2.5.ppc64le",
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            "BaseOS-10.2.Z:python-cryptography-debugsource-0:43.0.0-4.el10_2.5.x86_64",
            "BaseOS-10.2.Z:python3-cryptography-0:43.0.0-4.el10_2.5.aarch64",
            "BaseOS-10.2.Z:python3-cryptography-0:43.0.0-4.el10_2.5.ppc64le",
            "BaseOS-10.2.Z:python3-cryptography-0:43.0.0-4.el10_2.5.s390x",
            "BaseOS-10.2.Z:python3-cryptography-0:43.0.0-4.el10_2.5.x86_64",
            "BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.aarch64",
            "BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.ppc64le",
            "BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.s390x",
            "BaseOS-10.2.Z:python3-cryptography-debuginfo-0:43.0.0-4.el10_2.5.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:71658"
        },
        {
          "category": "workaround",
          "details": "The Rust PolicyBuilder verifier was introduced in cryptography 42.0.0 and this issue was fixed in 49.0.0 (signature-check budget of 128).",
          "product_ids": [
            "BaseOS-10.2.Z:python-cryptography-0:43.0.0-4.el10_2.5.src",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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          ]
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "python-cryptography: python-cryptography: Duplicate self-signed intermediates can cause exponential path-building"
    }
  ]
}

CVE-2026-69249 (GCVE-0-2026-69249)

Vulnerability from cvelistv5 – Published: 2026-08-03 21:26 – Updated: 2026-09-04 21:20

Title

python-cryptography: Duplicate self-signed intermediates can cause exponential path-building

Summary

python-cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 42.0.0 through 48.0.0, when resolving invalid certificate chains that include duplicate copies of self-signed certificates, the processing recursively invokes the same candidate, leading to an exponential blowup. Although the limitation that the chain depth cannot exceed a specified maximum depth prevents unbounded recursion and guarantees termination, an attacker-controlled certificate chain can lead the processing to easily take more than 5s to reject in testing. This amplification could form the basis for a resource exhaustion denial of service attack. The core issue arises in the recursive nature of build_chain_inner, which does not de-duplicate against previously analyzed candidates. As the correctness of validation is not affected, the integrity of a system cannot be compromised through this vector, only its availability. This issue is fixed in 49.0.0.

Severity

8.7 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-04 14:08 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/pyca/cryptography/security/adv…	x_refsource_CONFIRM
https://github.com/pyca/cryptography/pull/14960	x_refsource_MISC
https://github.com/pyca/cryptography/commit/3763aa79b	x_refsource_MISC
https://github.com/pyca/cryptography/commit/4a12c…	x_refsource_MISC
https://github.com/pypa/advisory-database/tree/ma…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pyca	cryptography	Affected: >= 42.0.0, < 49.0.0

Show details on NVD website

JSON

To clipboard

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  "containers": {
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                "id": "CVE-2026-69249",
                "options": [
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                "role": "CISA Coordinator",
                "timestamp": "2026-08-04T14:08:23.254769Z",
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        ],
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    "cna": {
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          "vendor": "pyca",
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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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2026:71658

CVE-2026-69249 (GCVE-0-2026-69249)

Tags

Sightings

Nomenclature

Related by attack behaviour