fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Versions 4.0.0-beta.3 through 5.5.5 contain a bypass vulnerability where numeric character references (NNN;, HH;) and standard XML entities completely evade the entity expansion limits (e.g., maxTotalExpansions, maxExpandedLength) added to fix CVE-2026-26278, enabling XML entity expansion Denial of Service. The root cause is that replaceEntitiesValue() in OrderedObjParser.js only enforces expansion counting on DOCTYPE-defined entities while the lastEntities loop handling numeric/standard entities performs no counting at all. An attacker supplying 1M numeric entity references like A can force ~147MB of memory allocation and heavy CPU usage, potentially crashing the process—even when developers have configured strict limits. This issue has been fixed in version 5.5.6.
CVE-2026-33036
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-03-17. A secondary CVSS source baseline 7.5; sources differ by 0.0.
Also known asEUVD-2026-13573 (ENISA EUVD) · GHSA-8gc5-j5rx-235r (GitHub Security Advisories)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 65EG Risk 65/100
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)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.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 public PoC (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
- 0.6%
- EPSS %ILE
- 48th
- 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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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, and whom BOD 26-04 binds: 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 public PoC (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.
The score's inputs: 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
March 20, 2026
Last Modified
June 17, 2026
Advisory Details (3)
Auto-updated Aug 2, 2026Numeric entity expansion bypasses all entity expansion limits (incomplete fix for CVE-2026-26278) · Advisory · NaturalIntelligence/fast-xml-parser · GitHub
https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8gc5-j5rx-235rfix entity expansion and incorrect replacement and performance
Patch available: NaturalIntelligence/fast-xml-parser v5.5.6
https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.5.6commit bd26122c838e (NaturalIntelligence/fast-xml-parser)
Patch available: NaturalIntelligence/fast-xml-parser v5.5.6 (contains commit bd26122c838e)
https://github.com/NaturalIntelligence/fast-xml-parser/commit/bd26122c838e6a55e7d7ac49b4ccc01a49999a01Vendor Advisories for CVE-2026-33036(12)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:51349Red Hat Product SecurityHigh
Red Hat Security Advisory: General availability of the satellite/iop-host-inventory-frontend-rhel9 container image
- RHSA-2026:41944Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.19.20 security, enhancement & bug fix update
- RHSA-2026:41941Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.25 security, enhancement & bug fix update
- RHSA-2026:40984Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.20.15 security, enhancement & bug fix update
- RHSA-2026:17550Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.17.24 security, enhancement & bug fix update
- RHSA-2026:17549Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.16.26 security, enhancement & bug fix update
- RHSA-2026:17547Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.20 security, enhancement & bug fix update
- RHSA-2026:12279Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.19.15 security, enhancement & bug fix update
- +4 more
Patch Availability(14)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | satellite/iop-host-inventory-frontend-rhel9:1785922764 | 2026-08-06 | redhat |
| redhat | odf4/rook-ceph-rhel9-operator:1783677533 | 2026-07-20 | redhat |
| redhat | odf4/rook-ceph-rhel9-operator:1783685375 | 2026-07-20 | redhat |
| redhat | odf4/rook-ceph-rhel9-operator:1783669219 | 2026-07-16 | redhat |
| redhat | odf4/rook-ceph-rhel9-operator:1778050482 | 2026-05-14 | redhat |
| redhat | odf4/rook-ceph-rhel9-operator:1778077839 | 2026-05-14 | redhat |
| redhat | odf4/rook-ceph-rhel9-operator:1778046079 | 2026-05-14 | redhat |
| redhat | odf4/rook-ceph-rhel9-operator:1775823207 | 2026-04-30 | redhat |
| redhat | odf4/rook-ceph-rhel9-operator:1776079774 | 2026-04-30 | redhat |
| redhat | rhdh/rhdh-hub-rhel9:1776784286 | 2026-04-22 | redhat |
| redhat | advanced-cluster-security/rhacs-main-rhel8:1775594284 | 2026-04-08 | redhat |
| redhat | advanced-cluster-security/rhacs-main-rhel8:1775594119 | 2026-04-08 | redhat |
| npm | fast-xml-parser @ 5.5.6 (fixes >= 5.0.0, < 5.5.6) | — | ghsa |
| npm | fast-xml-parser @ 4.5.5 (fixes >= 4.0.0-beta.3, < 4.5.5) | — | 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
(4 across 4 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-webfont | 11.4.0+dfsg2+~cs35.7.26-10 ... 11.4.0+dfsg2+~cs35.7.26-9 (14 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-webfont | 11.4.0+dfsg2+~cs35.7.26-13 ... 11.4.0+dfsg2+~cs35.7.26-21 (8 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-webfont | 11.4.0+dfsg2+~cs35.7.26-13 ... 11.4.0+dfsg2+~cs35.7.26-21 (8 versions) |
| — |
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| fast-xml-parser | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 44× 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 96 of 130 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. 4 repeat rows among the latest 100 are merged into the row they repeat. The 34 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-01 07:54 UTCGHSA enrichmentGHSA-8gc5-j5rx-235r · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-01 07:54 UTCEG score recompute
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-30 10:51 UTCEG score recompute
- 2026-10-30 10:51 UTCVendor advisory
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-25 14:35 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-10-24 01:19 UTCEG score recompute
- 2026-10-24 01:19 UTCVendor advisory
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-10-18 03:47 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-10-17 15:47 UTCEG score recompute
Show 71 moreShow fewer
- 2026-10-17 15:47 UTCVendor advisory
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-12 16:13 UTCEG score recompute
- 2026-10-11 19:56 UTCEG score recompute
- 2026-10-11 17:09 UTCEG score recompute
- 2026-10-11 14:36 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-11 07:55 UTCOSV refresh
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-21 20:32 UTCOSV refresh
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-02 17:08 UTCOSV refresh
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-16 11:04 UTCEG score recompute
- 2026-08-16 11:04 UTCVendor advisory
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-14 19:50 UTCVendor advisory
- 2026-08-14 07:14 UTCEG score recompute
- 2026-08-14 07:14 UTCVendor advisory
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-12 21:55 UTCEG score recompute
- 2026-08-12 21:55 UTCVendor advisory
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-08-11 21:24 UTCEG score recompute
- 2026-08-11 21:24 UTCVendor advisory
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:12:node-webfont · npm:fast-xml-parser
Same vendor
10 shownredhat:RHSA-2026:12277 · redhat:RHSA-2026:40984
Frequently asked(5)
What is CVE-2026-33036?
When was the CVE record for CVE-2026-33036 published?
Is CVE-2026-33036 actively exploited?
What is the CVSS score of CVE-2026-33036?
How do I remediate CVE-2026-33036?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33036
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