8.7

CVE-2026-83616: xmldom: Processing Instruction Target Injection Bypasses requireWellFormed

Deferred
AliasesUBUNTU-CVE-2026-83616DEBIAN-CVE-2026-83616GHSA-c7q8-3ch8-vqpv
Published 01-09-2026Last modified 01-09-2026

Vulnerability summary

CVE-2026-83616 is a high (CVSS 8.7) XML Injection vulnerability in xmldom. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 49.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.7 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.61%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 01-09-2026
    PublishedVulnerability first disclosed.
  2. 01-09-2026
    Last modifiedVulnerability information updated.

Description

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, Document.createProcessingInstruction(target, data) in lib/dom.js accepts an unvalidated target, while the requireWellFormed: true serializer checks only for a colon and the reserved case-insensitive xml name on 0.9.x and performs no target check on 0.8.x. Because serialization emits <?target data?>, a target containing >, ?, whitespace, or another invalid XML-name character can break the processing-instruction boundary and inject XML structure. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.61% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard3 products
  • gitlab-rails-ce-18.11< 18.11.11-r2
  • gitlab-rails-ce-19.0All versions (No fix recorded) | < 19.0.10-r0
  • gitlab-rails-ce-fips-19.0< 19.0.9-r3
@xmldom1 product
  • xmldom≥ 0.7.0, < 0.8.15 | ≥ 0.9.0, < 0.9.12
Debian1 product
  • node-xmldomAll versions (No fix recorded) | < 0.9.12-1
Npm1 product
  • xmldom≤ 0.6.0
Ubuntu1 product
  • node-xmldomAll versions (No fix recorded)
Xmldom1 product
  • xmldom≤ 0.6.0 | ≥ 0.7.0, < 0.8.15 | ≥ 0.9.0, < 0.9.12

6 vendors · 8 products

References

13 links
Show all 13 references