CVE-2026-44665: naturalintelligence fast-xml-builder
CVSS: 6.1v3.1MediumDeferred
AliasesCGA-3v5c-pxhw-pfh7CGA-93r5-x25g-3p45CGA-pjj4-cg77-gf5vCGA-vfrc-624h-m83vGHSA-5wm8-gmm8-39j9CGA-2ff4-9ff2-p46qCGA-2xrg-fv6h-7j4jCGA-32jw-rh8x-cx3hCGA-4c3g-9369-93qwCGA-4jfc-jm9w-x89cCGA-4pj6-w6rv-j92wCGA-5c88-q4gv-7gpqCGA-5h8p-89m8-j8qgCGA-6867-6jv6-qqxjCGA-6958-hgjm-gp88CGA-6jw2-77j2-j7g7CGA-6pq9-32r8-2fqxCGA-6qj5-ph22-r5jhCGA-6qwg-qx96-3v6hCGA-6rwc-wq95-55gfCGA-73j9-w92c-j28cCGA-922v-9wwp-m36jCGA-cjgm-5p5q-5mfhCGA-cx6m-ffhh-g42xCGA-fcmm-qvqj-g4rfCGA-g3w4-m2q2-f4xxCGA-hjfc-xmq6-93g2CGA-hq4m-3m3q-mh9cCGA-hx6q-37h4-hr3gCGA-j677-f6m2-74xjCGA-jpj8-2gm8-vmvgCGA-jq7h-43cm-3p32CGA-jqg2-h5r2-9g6jCGA-m37x-r6pr-jwjfCGA-m666-p9cm-wc4hCGA-mg2g-4g3x-jxg6CGA-p34h-pq5f-pf62CGA-pv6p-9pcv-559cCGA-pv9w-59j5-6rw6CGA-q679-53f8-7pgcCGA-v3j2-j9qh-594gCGA-vrp8-qmqh-r2h7CGA-w9pr-jg55-8hh6CGA-wp5m-qgc3-2cwvCGA-ww45-825x-4v85
Published 13-05-2026Last modified 18-05-2026
Vulnerability summary
CVE-2026-44665 is a medium (CVSS 6.1) vulnerability in naturalintelligence fast-xml-builder. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.7% of scored vulnerabilities.
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)EPSS score
0.25%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 13-05-2026PublishedVulnerability first disclosed.
- 18-05-2026Last modifiedVulnerability information updated.
Description
fast-xml-builder builds XML from JSON. Prior to 1.1.7, when an input data has quotes in attribute values but process entities is not enabled, it breaks the attribute value into multiple attributes. This gives the room for an attacker to insert unwanted attributes to the XML/HTML. This vulnerability is fixed in 1.1.7.
CVSS metrics
6 scores · 5 sources · 2 versionsHigh 8.7Preferred score · OSV · Npm (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NSourcesSingle source
Medium 6.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NSourcesAll 5 agree
- OSV · WolfiEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · NpmEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · ChainguardEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- NVDNIST6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
0.25%
Chance of exploitation in the next 30 days
Percentile
16%
Versus all other CVEs
30-day change
+0.04 pp
From 0.21% on 19-09-2026
19-09-202619-10-2026
EPSS score0.25%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard22 products
- dbgate< 7.1.10-r0
- dbgate-fips< 7.1.10-r0
- kibana-8.17< 8.17.10-r20
- kibana-8.17-bitnami< 8.17.10-r20
- kibana-8.17-iamguarded< 8.17.10-r20
Wolfi2 products
- opensearch-dashboards-3< 3.6.0-r4
- renovate< 43.170.12-r0 | < 43.170.14-r0
Naturalintelligence1 product
- fast-xml-builder< 1.1.7
Npm1 product
- fast-xml-builder< 1.1.7
4 vendors · 26 products
References
4 links- github.com/NaturalIntelligence/fast-xml-builder/security/advisories/GHSA-5wm8-gmm8-39j9X Refsource CONFIRMAdvisoryWEB
