Intel

CVE-2026-41920

traffic_server: Improper Access Control (CVE-2026-41920)

criticalEPSS 0.5%

Affected

  • apache/traffic_server between 9.0.0..9.2.15
  • apache/traffic_server between 10.0.0..10.1.4

Description

Improper Access Control vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.1.15 or 10.1.4, which fixes the issue.

Source: NVD (NIST)cvelistv5BSI WID PortalBSI CSAF

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

apachetraffic_server
10.0.0 – 10.1.49.0.0 – 9.2.15

Metrics

XIEM Effective CVSS
9.3
Source: nvd-v3
EPSS percentile
43.2 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
critical
Priority score
84.97
Exploit maturity
no public PoC known
CVSS v3
9.3
CVSS v4
7.0
EPSS score
0.5 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-07-29 07:18 UTC
CWE
CWE-284

Weakness classes (CWE)

  • CWE-284Pillar

    Improper Access Control

    The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. Initial Analysis2026-08-03 13:42 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* versions from (including) 10.0.0 up to (excluding) 10.1.4 *cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* versions from (including) 9.0.0 up to (excluding) 9.2.15
    • Reference Type: Apache Software Foundation: https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d Types: Mailing List, Vendor Advisory
  2. CVE Modified2026-07-29 14:16 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-41920","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical…
  3. New CVE Received2026-07-29 08:16 UTC· security@apache.org
    • Affected: Apache Traffic Server
    • Description: Improper Access Control vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.1.15 or 10.1.4, which fixes the issue.
    • CVSS V4.0: AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/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
    • CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Linked advisories