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AEGLIX vulnerability intelligence

CVE-2026-34480

MEDIUM · CVSS 6.9 · Analyzed

Published: 2026-04-10 · Updated: 2026-10-26 · Source: NVD

Stored catalog record

Source record retrieved 2026-10-28T10:18:46.523501+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

Vulnerability overview

Apache Log4j Core's XmlLayout https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout , in versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets producing invalid XML output whenever a log message or MDC value contains such characters. The impact depends on the StAX implementation in use: * JRE built-in StAX: Forbidden characters are silently written to the output, producing malformed XML. Conforming parsers must reject such documents with a fatal error, which may cause downstream log-processing systems to drop the affected records. * Alternative StAX implementations (e.g., Woodstox https://github.com/FasterXML/woodstox , a transitive dependency of the Jackson XML Dataformat module): An exception is thrown during the logging call, and the log event is never delivered to its intended appender, only to Log4j's internal status logger. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue by sanitizing forbidden characters before XML output.

Patch review priority

Assess exposure and vendor guidance

  • No higher-priority signal is available in the current stored evidence.

FIRST EPSS: 1.05% · percentile 64.0 · score date 2026-10-27.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score
6.9 · MEDIUM
CVSS version
4.0
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses
CWE-116

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*

    From (inclusive): 2.0

    Before (exclusive): 2.25.4

  • cpe:2.3:a:apache:log4j:3.0.0:alpha1:*:*:*:*:*:*

  • cpe:2.3:a:apache:log4j:3.0.0:alpha1_rc1:*:*:*:*:*:*

  • cpe:2.3:a:apache:log4j:3.0.0:alpha1_rc2:*:*:*:*:*:*

  • cpe:2.3:a:apache:log4j:3.0.0:beta1:*:*:*:*:*:*

  • cpe:2.3:a:apache:log4j:3.0.0:beta2:*:*:*:*:*:*

  • cpe:2.3:a:apache:log4j:3.0.0:beta3:*:*:*:*:*:*

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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