Vulnerability-Lookup

CVE-2026-40890 (GCVE-0-2026-40890)

Vulnerability from cvelistv5 – Published: 2026-04-21 19:51 – Updated: 2026-04-21 20:36

Title

github.com/gomarkdown/markdown: Out-of-bounds Read in SmartypantsRenderer

Summary

The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 20:16 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/gomarkdown/markdown/security/a…	x_refsource_CONFIRM
https://github.com/gomarkdown/markdown/commit/759…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
gomarkdown	markdown	Affected: < 759bbc3e32073c3bc4e25969c132fc520eda2778	guessed

Show details on NVD website

JSON

To clipboard

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        {
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      "id": "CVE-2026-40890",
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      "product_status:fixed": "20",
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      "title": "SUSE CVE CVE-2026-40890",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-40890.json",
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    },
    "vulnrichment": {
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}

RHSA-2026:21769

Vulnerability from csaf_redhat - Published: 2026-05-28 20:39 - Updated: 2026-09-16 16:59

Summary

Red Hat Security Advisory: Multicluster Global Hub 1.5.4 security update

Severity

Important

Scope

35 vulnerabilities in this advisory, including CVE-2026-40890.

CVE-2026-40890

A flaw was found in github.com/gomarkdown/markdown, a Go library for parsing Markdown text and rendering as HTML. A remote attacker could exploit this vulnerability by providing a specially crafted malformed input. Specifically, input containing a '<' character not followed by a '>' character, when processed by the SmartypantsRenderer, can lead to an out-of-bounds read or a panic. This can result in a denial of service (DoS) for the application, making it unavailable to legitimate users.

7.5 (High)


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

Fixed: 4 products Known not affected: 17 products

https://access.redhat.com/errata/RHSA-2026:21769

Open the full advisory

RHSA-2026:22347

Vulnerability from csaf_redhat - Published: 2026-06-01 22:12 - Updated: 2026-09-16 17:00

Summary

Red Hat Security Advisory: Multicluster Global Hub 1.4.5 security update

Severity

Important

Scope

35 vulnerabilities in this advisory, including CVE-2026-40890.

CVE-2026-40890

7.5 (High)


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

Fixed: 4 products Known not affected: 17 products

https://access.redhat.com/errata/RHSA-2026:22347

Open the full advisory

RHSA-2026:23345

Vulnerability from csaf_redhat - Published: 2026-06-04 14:16 - Updated: 2026-09-16 17:00

Summary

Red Hat Security Advisory: Multicluster Global Hub 1.6.2 security update

Severity

Important

Scope

35 vulnerabilities in this advisory, including CVE-2026-40890.

CVE-2026-40890

7.5 (High)


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

Fixed: 4 products Known not affected: 17 products

https://access.redhat.com/errata/RHSA-2026:23345

Open the full advisory

RHSA-2026:24503

Vulnerability from csaf_redhat - Published: 2026-06-08 14:02 - Updated: 2026-09-16 12:04

Summary

Red Hat Security Advisory: Multicluster Global Hub 1.7.1 security update

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2026-40890.

CVE-2026-40890

7.5 (High)


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

Fixed: 4 products Known not affected: 17 products

https://access.redhat.com/errata/RHSA-2026:24503

Open the full advisory

RHSA-2026:24539

Vulnerability from csaf_redhat - Published: 2026-06-08 17:49 - Updated: 2026-09-10 17:17

Summary

Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.15.3 security update

Severity

Important

Scope

20 vulnerabilities in this advisory, including CVE-2026-40890.

CVE-2026-40890

7.5 (High)


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

Fixed: 4 products Known not affected: 180 products

https://access.redhat.com/errata/RHSA-2026:24539

Open the full advisory

ubuntu-cve-2026-40890

Vulnerability from osv_ubuntu

Published

2026-04-21 20:17

Modified

2026-05-20 15:27

Summary

Details

The package github.com/gomarkdown/markdown is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778.

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-40890	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-40890	REPORT
	https://github.com/gomarkdown/markdown/security/a…	REPORT
	https://github.com/gomarkdown/markdown/commit/759…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-gomarkdown-markdown-dev",
            "binary_version": "0.0~git20231115.a660076-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "golang-github-gomarkdown-markdown",
        "purl": "pkg:deb/ubuntu/golang-github-gomarkdown-markdown@0.0~git20231115.a660076-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20220731.dcdaee8-2",
        "0.0~git20231115.a660076-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-gomarkdown-markdown-dev",
            "binary_version": "0.0~git20231115.a660076-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "golang-github-gomarkdown-markdown",
        "purl": "pkg:deb/ubuntu/golang-github-gomarkdown-markdown@0.0~git20231115.a660076-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20231115.a660076-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-gomarkdown-markdown-dev",
            "binary_version": "0.0~git20231115.a660076-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "golang-github-gomarkdown-markdown",
        "purl": "pkg:deb/ubuntu/golang-github-gomarkdown-markdown@0.0~git20231115.a660076-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20231115.a660076-1"
      ]
    }
  ],
  "aliases": [],
  "details": "The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a \u003c character that is not followed by a \u003e character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778.",
  "id": "UBUNTU-CVE-2026-40890",
  "modified": "2026-05-20T15:27:26Z",
  "published": "2026-04-21T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-40890"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-40890"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-40890"
  ]
}

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.
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

CVE-2026-40890 (GCVE-0-2026-40890)

RHSA-2026:21769

RHSA-2026:22347

RHSA-2026:23345

RHSA-2026:24503

RHSA-2026:24539

ubuntu-cve-2026-40890

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour