Event Monitor Cyber
EM-20261105-CG1U VulnerabilityHigh severity

Apache Sling Engine Vulnerability (CVE-2026-103866)

CVE-2026-103866

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Status
Developing

Since : signals keep joining.

First Signal
Nov 05 12:33 UTCC41 Red Hat Security Data
Page Born
Nov 05 13:17 UTCsecond source joined
Last Signal
Nov 05 13:17 UTC6 days before snapshot
Sources
21 official · 1 research, news or crowd
Open For
5 daysso far

Life Of This Page

  1. 1
    Born
    A second, independent source names it.
  2. 2
    Developing · Now
    New signals join; severity can move.
  3. 3
    Confirmed
    Not yet
    CISA KEV lists it, or exploitation in the wild is reported.
  4. 4
    Resolved
    Not yet
    Past the fix deadline and 14 days with no new signal.
  5. 5
    Archived
    Not yet
    30 days after resolved. Read only; the link keeps working. Reopens if it comes back.

The ID never changes, and earlier addresses keep working. A correction is logged, never overwritten. If two pages turn out to be one incident, the later one points to the earlier.

Vulnerability Lifecycle

  1. Disclosed: reached
    Nov 05 13:17 UTC
    C6 NVD published
  2. Scored: reached
    Nov 05 13:17 UTC
    CVSS 7.5 · EPSS 0.2%
  3. Exploited: not yet
    Not yet
    No exploitation reported
  4. Advisories: not yet
    Not yet
    None yet
  5. Vendor Response: reached
    Nov 05 12:33 UTC
    C41 published
  6. Resolved: not yet
    Not yet
    After 14 quiet days

Timeline

12:0018:00Nov 6BornC41 Red Hat Security DataC6 NVD CVE API 2.0

Point at a mark to read it. Squares are signals, colored by severity; every one is also listed under Signals.

Signals

  1. CVE-2026-103866 (CVSS 7.5) (opens source in a new tab) Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') vulnerability in Apache Sling Engine. The engine's query/form parser accepts non-standard percent-escapes, wrong charsets, and continues… High severityDatabaseC6 NVD CVE API 2.0
  2. Red Hat: CVE-2026-103866 (low) (opens source in a new tab) org.apache.sling/org.apache.sling.engine: Apache Sling Engine: HTTP request smuggling via malformed query and form parsing Info severityVendorC41 Red Hat Security Data