Vulnerability-Lookup

RHSA-2026:19197

Vulnerability from csaf_opensuse - Published: 2026-05-19 00:00 - Updated: 2026-09-16 18:18

Summary

security update for python-jwcrypto

Severity

Low

Notes

Title of the patch: security update for python-jwcrypto

Description of the patch: This security update provides a functional equivalent of RHSA-2026:19197. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2026:19197.

Patchnames: RHSA-2026:19197

CVE-2026-39373

7.5 (High)


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

Affected products

Recommended 1 product

Product	Identifier	Version	Remediation
Unresolved product id: SUSE Liberty Linux 9:python3-jwcrypto-1.5.6-3.el9_8.noarch		—	Vendor Fix

Threats

Impact important

References

7 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/r…	self
https://lists.suse.com/pipermail/suse-liberty-lin…	self
https://lists.suse.com/pipermail/suse-liberty-lin…	self
https://www.suse.com/security/cve/CVE-2026-39373/	self
https://www.suse.com/security/cve/CVE-2026-39373	external
https://bugzilla.suse.com/1261802	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.suse.com/support/security/rating/",
      "text": "Low"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "security update for python-jwcrypto",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "This security update provides a functional equivalent of RHSA-2026:19197.\nThe original Red Hat(R) advisory is available from the Red Hat web site at\nhttps://access.redhat.com/errata/RHSA-2026:19197.\n",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "RHSA-2026:19197",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://www.suse.com/support/security/contact/",
      "name": "SUSE Product Security Team",
      "namespace": "https://www.suse.com/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
      },
      {
        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_19197.json"
      },
      {
        "category": "self",
        "summary": "URL for RHSA-2026:19197",
        "url": "https://lists.suse.com/pipermail/suse-liberty-linux-updates/2026-June/005726.html"
      },
      {
        "category": "self",
        "summary": "E-Mail link for RHSA-2026:19197",
        "url": "https://lists.suse.com/pipermail/suse-liberty-linux-updates/2026-June/005726.html"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-39373 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-39373/"
      }
    ],
    "title": "security update for python-jwcrypto",
    "tracking": {
      "current_release_date": "2026-09-16T18:18:03Z",
      "generator": {
        "date": "2026-05-19T00:00:00Z",
        "engine": {
          "name": "cve-database.git:bin/generate-csaf.pl",
          "version": "1"
        }
      },
      "id": "RHSA-2026:19197",
      "initial_release_date": "2026-05-19T00:00:00Z",
      "revision_history": [
        {
          "date": "2026-05-19T00:00:00Z",
          "number": "1",
          "summary": "Current version"
        },
        {
          "date": "2026-09-16T17:44:49Z",
          "number": "2",
          "summary": "unknown changes"
        },
        {
          "date": "2026-09-16T18:01:58Z",
          "number": "3",
          "summary": "unknown changes"
        },
        {
          "date": "2026-09-16T18:18:03Z",
          "number": "4",
          "summary": "unknown changes"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "python3-jwcrypto-1.5.6-3.el9_8.noarch",
                "product": {
                  "name": "python3-jwcrypto-1.5.6-3.el9_8.noarch",
                  "product_id": "python3-jwcrypto-1.5.6-3.el9_8.noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/python3-jwcrypto@1.5.6-3.el9_8?arch=noarch"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "noarch"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "SUSE Liberty Linux 9",
                "product": {
                  "name": "SUSE Liberty Linux 9",
                  "product_id": "SUSE Liberty Linux 9",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:suse:sll:9"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python3-jwcrypto-1.5.6-3.el9_8.noarch as component of SUSE Liberty Linux 9",
          "product_id": "SUSE Liberty Linux 9:python3-jwcrypto-1.5.6-3.el9_8.noarch"
        },
        "product_reference": "python3-jwcrypto-1.5.6-3.el9_8.noarch",
        "relates_to_product_reference": "SUSE Liberty Linux 9"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-39373",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-39373"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing patch for CVE-2024-28102  limits input token size to 250KB but does not validate the decompressed output size. An unauthenticated attacker can cause memory exhaustion on memory-constrained systems. A token under the 250KB input limit can decompress to approximately 100MB. This vulnerability is fixed in 1.5.7.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Liberty Linux 9:python3-jwcrypto-1.5.6-3.el9_8.noarch"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-39373",
          "url": "https://www.suse.com/security/cve/CVE-2026-39373"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1261802 for CVE-2026-39373",
          "url": "https://bugzilla.suse.com/1261802"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Liberty Linux 9:python3-jwcrypto-1.5.6-3.el9_8.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Liberty Linux 9:python3-jwcrypto-1.5.6-3.el9_8.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-19T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-39373"
    }
  ]
}

CVE-2026-39373 (GCVE-0-2026-39373)

Vulnerability from cvelistv5 – Published: 2026-04-07 19:35 – Updated: 2026-04-07 20:22

Title

JWCrypto: JWE ZIP decompression bomb

Summary

JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing patch for CVE-2024-28102 limits input token size to 250KB but does not validate the decompressed output size. An unauthenticated attacker can cause memory exhaustion on memory-constrained systems. A token under the 250KB input limit can decompress to approximately 100MB. This vulnerability is fixed in 1.5.7.

Severity

5.3 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-07 20:22 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7595 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/latchset/jwcrypto/security/adv…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
latchset	jwcrypto	Affected: < 1.5.7

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-39373",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-07T20:22:50.934916Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-07T20:22:57.790Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "jwcrypto",
          "vendor": "latchset",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.5.7"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing patch for CVE-2024-28102  limits input token size to 250KB but does not validate the decompressed output size. An unauthenticated attacker can cause memory exhaustion on memory-constrained systems. A token under the 250KB input limit can decompress to approximately 100MB. This vulnerability is fixed in 1.5.7."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-409",
              "description": "CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-07T19:35:36.071Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/latchset/jwcrypto/security/advisories/GHSA-fjrm-76x2-c4q4",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/latchset/jwcrypto/security/advisories/GHSA-fjrm-76x2-c4q4"
        }
      ],
      "source": {
        "advisory": "GHSA-fjrm-76x2-c4q4",
        "discovery": "UNKNOWN"
      },
      "title": "JWCrypto: JWE ZIP decompression bomb"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-39373",
    "datePublished": "2026-04-07T19:35:36.071Z",
    "dateReserved": "2026-04-06T21:29:17.350Z",
    "dateUpdated": "2026-04-07T20:22:57.790Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Related by attack behaviour

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-2026:19197

CVE-2026-39373 (GCVE-0-2026-39373)

Tags

Sightings

Nomenclature

Related by attack behaviour