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Vulnerabilities

Vulnerability · CVE-2021-4249

xml-conduit unbounded entity expansion

Published Nov 14, 2025 · catalog updated May 30, 2026 · xml-conduit unbounded entity expansion

Check if you run it

No confirmed exploitation is on record for CVE-2021-4249. EPSS is 0.83%. Act only if a listed version of xml-conduit unbounded entity expansion is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (xml-conduit unbounded entity expansion).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.83%
Remediation
Not established
Affected products
Hackage xml-conduit

# 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 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 . It is recommended to upgrade the affected component.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Hackage xml-conduit0.5.0 → 1.9.1.0

How to fix CVE-2021-4249

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-4249. EPSS is 0.83%. Act only if a listed version of xml-conduit unbounded entity expansion is installed.

Which versions are affected?

Compare what you have installed with 0.5.0 → 1.9.1.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.83%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 14, 2025 · OpenSSF OSV / OSV Scanner

    Detected

    # 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 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 . It is r

  2. May 30, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    xml-conduit fixed in 1.9.1.0

  3. May 30, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    xml-conduit fixed in 1.9.1.0

  4. May 30, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    # 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 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 . It is r

Sources

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.