CVE-2026-7210

CRITICALNVD 7.59.8
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 9.8 from GitHub Security Advisory (severity: MODERATE) published 2026-05-11. NVD baseline CVSS 7.5; sources differ by 2.3.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-29178 (ENISA EUVD) · GHSA-wxv8-w48j-r2f4 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 11, 2026

Last Modified

October 26, 2026

Advisory Details (5)

Auto-updated May 16, 2026
Patch available.
Web page

oss-security - [CVE-2026-7210] Cpython: The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

http://www.openwall.com/lists/oss-security/2026/05/11/8
Web page

oss-security - Re: [CVE-2026-7210] Cpython: The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

http://www.openwall.com/lists/oss-security/2026/05/11/13
Web page

Mailman 3 [CVE-2026-7210] The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection - Security-announce - python.org

https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
Web page

gh-149018: Use `XML_SetHashSalt16Bytes` in `pyexpat`/`_elementtree` when possible by StanFromIreland · Pull Request #149023 · python/cpython · GitHub

https://github.com/python/cpython/pull/149023
Web page

[CVE-2026-7210] Insufficient entropy in `pyexpat` with protection against hash flooding · Issue #149018 · python/cpython · GitHub

https://github.com/python/cpython/issues/149018

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.13+esm23) @ xenial2026-11-01ubuntu
redhatpython3-10-main-3.10.21-1.4.hum12026-09-18redhat
redhatpython3-13-main-3.13.15-1.3.hum12026-09-16redhat
redhatpython3-11-main-3.11.16-1.4.hum12026-09-16redhat
redhatpython3-12-main-3.12.14-1.3.hum12026-09-16redhat
redhatpython3-14-main-3.14.7-1.2.hum12026-09-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(10 across 8 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
python2.72.7.18-10 ... 2.7.18-9 (10 versions)
  • every version on: no fix on record
—
python3.93.9.10-1 ... 3.9.9-4 (29 versions)
  • every version on: no fix on record
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
python3.133.13.11-1 ... 3.13.9-1 (7 versions)
  • every version up to 3.13.14-1: fixed in 3.13.14-1
—
python3.143.14.0-1 ... 3.14.5~rc1-1 (23 versions)
  • every version up to 3.14.6-1: fixed in 3.14.6-1
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
python3—
  • every version up to 3.12.14-r0: fixed in 3.12.14-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
python3—
  • every version up to 3.12.14-r0: fixed in 3.12.14-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
python3—
  • every version up to 3.12.14-r0: fixed in 3.12.14-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
python3—
  • every version up to 3.14.7-r0: fixed in 3.14.7-r0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python3.113.11.2-6 ... 3.11.9-1 (28 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python3.133.13.11-1 ... 3.13.9-1 (14 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 33× in last 7d / 103× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 521 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 421 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 00:38 UTCEG score recompute
  2. 2026-11-02 00:38 UTCVendor advisory
  3. 2026-11-02 00:38 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub severity MODERATE · GitHub CVSS 9.8
  4. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-11-01 02:48 UTCEG score recompute
  6. 2026-11-01 02:48 UTCVendor advisory
  7. 2026-11-01 02:48 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  8. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  9. 2026-10-31 04:58 UTCEG score recompute
  10. 2026-10-31 04:58 UTCVendor advisory
  11. 2026-10-31 04:58 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  12. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  13. 2026-10-30 07:09 UTCEG score recompute
  14. 2026-10-30 07:09 UTCVendor advisory
  15. 2026-10-30 07:09 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  16. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-10-29 09:18 UTCEG score recompute
  18. 2026-10-29 09:18 UTCVendor advisory
  19. 2026-10-29 09:18 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  20. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  21. 2026-10-28 11:29 UTCEG score recompute
  22. 2026-10-28 11:29 UTCVendor advisory
  23. 2026-10-28 11:29 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  24. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  25. 2026-10-27 13:13 UTCVendor advisory
Show 75 more
  1. 2026-10-27 13:13 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  2. 2026-10-26 18:28 UTCEG score recompute
  3. 2026-10-26 18:28 UTCVendor advisory
  4. 2026-10-26 18:28 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  5. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  6. 2026-10-26 12:03 UTCEG score recompute
  7. 2026-10-26 12:03 UTCVendor advisory
  8. 2026-10-26 12:03 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  9. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-10-25 14:08 UTCVendor advisory
  11. 2026-10-25 14:08 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  12. 2026-10-25 14:07 UTCEG score recompute
  13. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-10-24 16:17 UTCVendor advisory
  15. 2026-10-24 16:17 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  16. 2026-10-23 18:18 UTCEG score recompute
  17. 2026-10-23 18:18 UTCVendor advisory
  18. 2026-10-23 18:18 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  19. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  20. 2026-10-22 20:22 UTCEG score recompute
  21. 2026-10-22 20:22 UTCVendor advisory
  22. 2026-10-22 20:22 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  23. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-10-21 22:10 UTCEG score recompute
  25. 2026-10-21 22:10 UTCVendor advisory
  26. 2026-10-21 22:10 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  27. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  28. 2026-10-21 00:21 UTCEG score recompute
  29. 2026-10-21 00:21 UTCVendor advisory
  30. 2026-10-21 00:20 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  31. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  32. 2026-10-20 02:27 UTCEG score recompute
  33. 2026-10-20 02:27 UTCVendor advisory
  34. 2026-10-20 02:26 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  35. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  36. 2026-10-19 01:49 UTCEG score recompute
  37. 2026-10-19 01:49 UTCVendor advisory
  38. 2026-10-19 01:49 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  39. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  40. 2026-10-18 04:00 UTCVendor advisory
  41. 2026-10-18 04:00 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  42. 2026-10-18 03:16 UTCEG score recompute
  43. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  44. 2026-10-17 06:08 UTCEG score recompute
  45. 2026-10-17 06:08 UTCVendor advisory
  46. 2026-10-17 06:08 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  47. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  48. 2026-10-16 07:15 UTCEG score recompute
  49. 2026-10-16 07:15 UTCVendor advisory
  50. 2026-10-16 07:15 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  51. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  52. 2026-10-15 06:08 UTCEG score recompute
  53. 2026-10-15 06:08 UTCVendor advisory
  54. 2026-10-15 06:08 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  55. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  56. 2026-10-14 01:45 UTCEG score recompute
  57. 2026-10-14 01:45 UTCVendor advisory
  58. 2026-10-14 01:45 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  59. 2026-10-13 16:35 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  60. 2026-10-12 21:56 UTCEG score recompute
  61. 2026-10-12 21:56 UTCVendor advisory
  62. 2026-10-12 21:55 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  63. 2026-10-12 16:35 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  64. 2026-10-12 15:42 UTCEG score recompute
  65. 2026-10-12 05:50 UTCVendor advisory
  66. 2026-10-12 05:50 UTCGHSA enrichmentGHSA-wxv8-w48j-r2f4 · GitHub CVSS 9.8
  67. 2026-10-11 19:27 UTCEG score recompute
  68. 2026-10-11 16:43 UTCEG score recompute
  69. 2026-10-11 14:03 UTCEG score recompute
  70. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  71. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  72. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  73. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  74. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  75. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.4% · 70th percentile

Frequently asked(5)

What is CVE-2026-7210?
CVE-2026-7210 is a critical-severity vulnerability; its CVE record was published on May 11, 2026. 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.
When was the CVE record for CVE-2026-7210 published?
The CVE record for CVE-2026-7210 was published on May 11, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-7210 actively exploited?
CVE-2026-7210 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-7210?
CVE-2026-7210 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 9.8 (CRITICAL).
How do I remediate CVE-2026-7210?
A fix for CVE-2026-7210 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-7210 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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