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CVE-2026-58155

Apache Traffic Server vulnerability

9.3 CRITICALEPSS 0.54%
  1. Published29 Jul 2026

Description

Apache Traffic Server truncates over-long header names, allowing header aliasing, request smuggling, and policy bypass. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Affected products

Apache Traffic Server≥ 10.0.0 < 10.1.4 · ≥ 8.0.0 ≤ 8.1.9 · ≥ 9.0.0 < 9.2.15

Remediation

Fixed in
Apache Traffic Server≥ 10.1.4

References

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Frequently asked

Is CVE-2026-58155 being actively exploited?

CVE-2026-58155 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.54%.

How severe is CVE-2026-58155?

CVE-2026-58155 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.54% probability of exploitation.

Which products are affected by CVE-2026-58155?

Affected products include Apache Traffic Server.

How do I fix CVE-2026-58155?

Upgrade affected software to a fixed version, for example Apache Traffic Server 10.1.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-58155 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.