HSEC-2023-0004 (CVE-2021-4249)

Vulnerability from osv_haskell – Published: 2025-11-14 14:45 – Updated: 2025-11-14 14:45 – Source website

Summary

xml-conduit unbounded entity expansion

Details

xml-conduit unbounded entity expansion

A vulnerability was found in xml-conduit. It has been classified as problematic. Affected is an unknown function of the file xml-conduit/src/Text/XML/Stream/Parse.hs of the component DOCTYPE Entity Expansion Handler. The manipulation leads to infinite loop. It is possible to launch the attack remotely. Upgrading to version 1.9.1.0 is able to address this issue. The name of the patch is 4be1021791dcdee8b164d239433a2043dc0939ea. It is recommended to upgrade the affected component.

References

URL

Type

	https://github.com/snoyberg/xml/pull/161	FIX
	https://github.com/snoyberg/xml/commit/4be1021791…	FIX

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "human_link": "https://github.com/haskell/security-advisories/tree/main/advisories/published/2023/HSEC-2023-0004.md",
        "osv": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2023/HSEC-2023-0004.json"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "xml-conduit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.5.0"
            },
            {
              "fixed": "1.9.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-4249"
  ],
  "database_specific": {
    "home": "https://github.com/haskell/security-advisories",
    "osvs": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export",
    "repository": "https://github.com/haskell/security-advisories"
  },
  "details": "# xml-conduit unbounded entity expansion\n\nA vulnerability was found in *xml-conduit*. It has been classified\nas problematic.  Affected is an unknown function of the file\n`xml-conduit/src/Text/XML/Stream/Parse.hs` of the component DOCTYPE\nEntity Expansion Handler. The manipulation leads to infinite loop.\nIt is possible to launch the attack remotely. Upgrading to version\n1.9.1.0 is able to address this issue. The name of the patch is\n`4be1021791dcdee8b164d239433a2043dc0939ea`. It is recommended to\nupgrade the affected component.\n",
  "id": "HSEC-2023-0004",
  "modified": "2025-11-14T14:45:34Z",
  "published": "2025-11-14T14:45:34Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/snoyberg/xml/pull/161"
    },
    {
      "type": "FIX",
      "url": "https://github.com/snoyberg/xml/commit/4be1021791dcdee8b164d239433a2043dc0939ea"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "xml-conduit unbounded entity expansion"
}

CVE-2021-4249 (GCVE-0-2021-4249)

Vulnerability from cvelistv5 – Published: 2022-12-18 00:00 – Updated: 2025-04-15 13:00

Title

xml-conduit DOCTYPE Entity Expansion Parse.hs infinite loop

Summary

A vulnerability was found in xml-conduit. It has been classified as problematic. Affected is an unknown function of the file xml-conduit/src/Text/XML/Stream/Parse.hs of the component DOCTYPE Entity Expansion Handler. The manipulation leads to infinite loop. It is possible to launch the attack remotely. Upgrading to version 1.9.1.0 is able to address this issue. The name of the patch is 4be1021791dcdee8b164d239433a2043dc0939ea. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216204.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-14 17:02 UTC

CWE

CWE-404 - Denial of Service -> CWE-835 Infinite Loop

Assigner

VulDB mitre root

References

4 references

URL	Tags
https://github.com/snoyberg/xml/pull/161
https://hackage.haskell.org/package/xml-conduit-1.9.1.0
https://github.com/snoyberg/xml/commit/4be1021791…
https://vuldb.com/?id.216204

Impacted products

1 product

Vendor	Product	Version
unspecified	xml-conduit	Affected: 0.5.0 Affected: 0.5.0.1 Affected: 0.5.1 Affected: 0.5.1.1 Affected: 0.5.1.2 Affected: 0.5.2 Affected: 0.5.3 Affected: 0.5.3.1 Affected: 0.5.4 Affected: 0.6.0 Affected: 0.6.1 Affected: 0.7.0 Affected: 0.7.0.1 Affected: 0.7.0.2 Affected: 0.7.0.3 Affected: 1.0.0 Affected: 1.0.1 Affected: 1.0.1.1 Affected: 1.0.2 Affected: 1.0.2.1 Affected: 1.0.3 Affected: 1.0.3.1 Affected: 1.0.3.2 Affected: 1.0.3.3 Affected: 1.1.0 Affected: 1.1.0.1 Affected: 1.1.0.2 Affected: 1.1.0.3 Affected: 1.1.0.4 Affected: 1.1.0.5 Affected: 1.1.0.6 Affected: 1.1.0.7 Affected: 1.1.0.8 Affected: 1.1.0.9 Affected: 1.2.0 Affected: 1.2.0.1 Affected: 1.2.0.2 Affected: 1.2.0.3 Affected: 1.2.1 Affected: 1.2.1.1 Affected: 1.2.2 Affected: 1.2.3 Affected: 1.2.3.1 Affected: 1.2.3.2 Affected: 1.2.3.3 Affected: 1.2.4 Affected: 1.2.5 Affected: 1.2.5.1 Affected: 1.2.6 Affected: 1.3.0 Affected: 1.3.1 Affected: 1.3.2 Affected: 1.3.3 Affected: 1.3.3.1 Affected: 1.3.4 Affected: 1.3.4.1 Affected: 1.3.4.2 Affected: 1.3.5 Affected: 1.4.0 Affected: 1.4.0.1 Affected: 1.4.0.2 Affected: 1.4.0.3 Affected: 1.4.0.4 Affected: 1.5.0 Affected: 1.5.1 Affected: 1.6.0 Affected: 1.7.0 Affected: 1.7.0.1 Affected: 1.7.1.0 Affected: 1.7.1.1 Affected: 1.7.1.2 Affected: 1.8.0 Affected: 1.8.0.1 Affected: 1.9.0.0

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.
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

HSEC-2023-0004 (CVE-2021-4249)

xml-conduit unbounded entity expansion

CVE-2021-4249 (GCVE-0-2021-4249)

Tags

Sightings

Nomenclature

Related by attack behaviour