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CVE-2026-58150 Apache CVE debrief

Apache Traffic Server does not reject Transfer-Encoding in HTTP/2 requests, allowing downgrade request smuggling. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue. The vulnerability allows for potential request smuggling attacks due to the improper handling of Transfer-Encoding headers in HTTP/2 requests. Affected deployments should review their configurations and plan for upgrades or mitigations. Evidence from official CVE and NVD sources confirms the vulnerability and provides details on affected versions and recommended upgrades.

Vendor
Apache
Product
Traffic Server
CVSS
HIGH 7.8
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, particularly those using affected versions, should be aware of this vulnerability and take steps to upgrade or mitigate the risk. This includes reviewing affected deployments, understanding potential impacts, and planning for upgrades or compensating controls.

Technical summary

The vulnerability allows for downgrade request smuggling due to Apache Traffic Server not rejecting Transfer-Encoding in HTTP/2 requests. 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. Upgrades to 9.2.15 or 10.1.4 are recommended. This issue has a high CVSS score of 7.8, indicating high severity. The vulnerability impacts the integrity and confidentiality of data processed by Apache Traffic Server, and users should prioritize upgrades or compensating controls. Reviewing official advisories and CVE records can provide further context and guidance on mitigating the risk.

Defensive priority

High priority due to high CVSS score of 7.8 and potential for request smuggling attacks.

Recommended defensive actions

  • Upgrade to version 9.2.15 or 10.1.4
  • Review and update affected versions of Apache Traffic Server
  • Monitor for potential request smuggling attacks
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

Evidence from official CVE and NVD sources indicates a vulnerability in Apache Traffic Server. The CVE record and NVD entry provide details on the affected versions and recommended upgrades. 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. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue. Evidence limits suggest verifying affected deployments and reviewing official advisories.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58150 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58150

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

  • CVE-2026-58150 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58150

    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.