CVE-2026-44896

MEDIUMNVD 6.16.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.3% (18th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
6.1EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and earlier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer. Version 3.2.1 contains a patch.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100

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)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
18th
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 (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-22). 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 26, 2026

Last Modified

July 24, 2026

Advisory Details (2)

Auto-updated Jun 13, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

XSS via unescaped figclass/figwidth in Figure directive · Advisory · lepture/mistune · GitHub

https://github.com/lepture/mistune/security/advisories/GHSA-58cw-g322-p94v
GitHub commit Patch Available

commit a3cb6e565530 (lepture/mistune)

Patch available: lepture/mistune v3.2.1 (contains commit a3cb6e565530)

https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2

Vendor Advisories for CVE-2026-44896(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
pipmistune—ghsa

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
mistune0.8.4-4 ... 3.1.4-1 (15 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
mistune2.0.4-1 ... 3.3.4-1 (7 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
mistune3.1.3-1, 3.1.4-1, 3.3.4-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
mistune3.1.3-1, 3.1.4-1, 3.3.4-1
  • every version on: no fix on record
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
mistune0.1.0 ... 3.2.0 (49 versions)
  • every version up to 3.2.1: fixed in 3.2.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 32× 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 230 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 130 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  2. 2026-10-22 23:41 UTCEG score recompute
  3. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  4. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  5. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  6. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  7. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  8. 2026-10-18 03:38 UTCEG score recompute
  9. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  11. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  12. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  13. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  14. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  15. 2026-10-12 16:04 UTCEG score recompute
  16. 2026-10-11 19:47 UTCEG score recompute
  17. 2026-10-11 17:01 UTCEG score recompute
  18. 2026-10-11 14:27 UTCEG score recompute
  19. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  20. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  21. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  22. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  23. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  24. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  25. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 17th percentile
Show 75 more
  1. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  2. 2026-10-03 19:51 UTCOSV refresh
  3. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  4. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  5. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  6. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  7. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  8. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  9. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  10. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  11. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  12. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  13. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  14. 2026-09-14 09:36 UTCEG score recompute
  15. 2026-09-14 09:36 UTCVendor advisory
  16. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  17. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  18. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  19. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  20. 2026-09-11 01:53 UTCOSV refresh
  21. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  22. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  23. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  24. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  25. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  26. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  27. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  28. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  29. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  30. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  31. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  32. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  33. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  34. 2026-08-23 15:56 UTCEG score recompute
  35. 2026-08-23 15:56 UTCVendor advisory
  36. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  37. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  38. 2026-08-21 21:20 UTCEG score recompute
  39. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  40. 2026-08-20 17:58 UTCEG score recompute
  41. 2026-08-20 17:58 UTCVendor advisory
  42. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  43. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  44. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  45. 2026-08-17 09:30 UTCEG score recompute
  46. 2026-08-17 09:30 UTCVendor advisory
  47. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  48. 2026-08-16 03:02 UTCEG score recompute
  49. 2026-08-16 03:02 UTCVendor advisory
  50. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  51. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  52. 2026-08-15 00:54 UTCVendor advisory
  53. 2026-08-14 01:40 UTCEG score recompute
  54. 2026-08-14 01:40 UTCVendor advisory
  55. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  56. 2026-08-12 22:47 UTCEG score recompute
  57. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  58. 2026-08-11 23:33 UTCEG score recompute
  59. 2026-08-11 23:33 UTCVendor advisory
  60. 2026-08-11 00:19 UTCEG score recompute
  61. 2026-08-11 00:19 UTCVendor advisory
  62. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  63. 2026-08-09 22:24 UTCEG score recompute
  64. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  65. 2026-08-08 23:10 UTCEG score recompute
  66. 2026-08-08 23:10 UTCVendor advisory
  67. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  68. 2026-08-07 19:30 UTCEG score recompute
  69. 2026-08-07 19:30 UTCVendor advisory
  70. 2026-08-06 20:15 UTCEG score recompute
  71. 2026-08-06 20:15 UTCVendor advisory
  72. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  73. 2026-08-05 21:00 UTCEG score recompute
  74. 2026-08-05 21:00 UTCVendor advisory
  75. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 9th percentile

Frequently asked(5)

What is CVE-2026-44896?
CVE-2026-44896 is a medium-severity vulnerability; its CVE record was published on May 26, 2026. Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and earlier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when…
When was the CVE record for CVE-2026-44896 published?
The CVE record for CVE-2026-44896 was published on May 26, 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 July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-44896 actively exploited?
CVE-2026-44896 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-44896?
CVE-2026-44896 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-44896?
A fix for CVE-2026-44896 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-44896 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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Is Your Infrastructure Affected by CVE-2026-44896?

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