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CVE-2026-58159 Apache CVE debrief

Apache Traffic Server has a vulnerability allowing IP access controls to be bypassed on UDS listeners due to ACL matching errors. This affects versions 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, and 10.0.0 through 10.1.3. The issue allows unauthorized access and potential security breaches. Users of Apache Traffic Server, especially those with high security requirements or using versions within the affected ranges, should be aware of this vulnerability and take necessary actions to upgrade or mitigate the risk. Evidence is limited to public CVE and NVD information. Defenders should verify affected versions, review access controls, and monitor for potential exploitation attempts. The CVE record was published on 2026-07-29T10:16:41.490Z and has not been modified since then.

Vendor
Apache
Product
Traffic Server
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-29
Original CVE updated
2026-08-03
Advisory published
2026-07-29
Advisory updated
2026-08-03

Who should care

Users of Apache Traffic Server, especially those with high security requirements or using versions within the affected ranges, should be aware of this vulnerability and take necessary actions to upgrade or mitigate the risk. This includes reviewing and updating access controls, monitoring for potential exploitation attempts, and considering compensating controls for exposed systems. IT teams responsible for Apache Traffic Server deployments should prioritize this vulnerability due to its high CVSS score and potential for access control bypass.

Technical summary

The vulnerability in Apache Traffic Server allows IP access controls to be bypassed on UDS listeners and through ACL matching errors. Affected versions include 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, and 10.0.0 through 10.1.3. The issue is fixed in versions 9.2.15 and 10.1.4. This bypass can lead to unauthorized access and potential security breaches. Users of Apache Traffic Server, especially those with high security requirements or using versions within the affected ranges, should be aware of this vulnerability and take necessary actions to upgrade or mitigate the risk.

Defensive priority

High priority due to high CVSS score and potential for access control bypass.

Recommended defensive actions

  • Upgrade to version 9.2.15 or 10.1.4
  • Review and update access controls
  • Monitor for potential exploitation attempts
  • Review compensating controls for exposed systems
  • Check relevant monitoring, detection, and logs for exposed assets
  • Track exceptions and retest remediated assets
  • Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and affected versions. Vendor advisory is available via a mailing list. The issue allows IP access controls to be bypassed on UDS listeners and through ACL matching errors in Apache Traffic Server versions 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, and 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4. Evidence is limited to public CVE and NVD information. Defenders should verify affected versions, review access controls, and monitor for potential exploitation attempts.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58159 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58159

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-58159 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58159

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.