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No exploitation reportedFix available

CVE-2026-7210

No exploitation reported by the sources we read.

  • Published2026-05-11
  • Fixed in3.14.6 · 3.13.14 · 3.12.14 · 3.11.16 · 3.10.22
  • WeaknessCWE-331

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

Timeline

dates in UTC
  1. 2026-05-1118:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-25 03:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-7210?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-7210?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Python
BranchAffectedFixed in
3.14≥ 3.14.0, < 3.14.63.14.6
3.13< 3.13.143.13.14
3.13≥ 3.13.0, < 3.13.143.13.14
3.12≥ 3.12.0, < 3.12.143.12.14
3.11≥ 3.11.0, < 3.11.163.11.16
3.10< 3.10.223.10.22
3.15= 3.15.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-7210 Red Hat Product Security95 products fixed · 219 known affected

    python: Python/Expat: Denial of Service via crafted XML document

    exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · rhaii/model-opt-cuda-rhel9 as a component of Red Hat AI Inference Server · rhaii/vllm-cpu-rhel9 as a component of Red Hat AI Inference Server · +216 more

  • RHSA-2026:69069 Red Hat Product Security15 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

  • RHSA-2026:68309 Red Hat Product Security19 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

  • RHSA-2026:68154 Red Hat Product Security15 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

  • RHSA-2026:68135 Red Hat Product Security15 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

  • RHSA-2026:67572 Red Hat Product Security31 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Full record on NVD

Fix

  1. Update Python to 3.14.6 · 3.13.14 · 3.12.14 · 3.11.16 · 3.10.22
  2. Vendor fix Red Hat Product Security RHSA-2026:69069 · 15 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  3. Workaround from the vendor Red Hat Product Security RHSA-2026:69069 · 15 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
  4. No fix available, says the vendor Red Hat Product Security CVE-2026-7210 · 219 productsFix deferred

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-05-11
Last Modified
2026-10-02
NVD status
Modified
MSRC Title
The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

Frequently asked questions

What is CVE-2026-7210?

`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

Is CVE-2026-7210 actively exploited?

Active exploitation of CVE-2026-7210 has not been confirmed. Its EPSS score was 0.7% on 2026-10-24, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-7210?

CVE-2026-7210 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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