CVE-2026-58189
SSRF amplification via redirect-limit bypass in Apache Traffic Server.
Is CVE-2026-58189 being exploited?
Not confirmed. CVE-2026-58189 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-58189?
CVE-2026-58189 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58189?
Yes. A fix has been recorded for CVE-2026-58189. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58189 affect?
CVE-2026-58189 affects Apache Traffic Server 8.0.0 - 8.1.9, Apache Traffic Server 9.0.0 - 9.2.14, Apache Traffic Server 10.0.0 - 10.1.3, Fixed in 9.2.15 and 10.1.4. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58189?
Upgrade ATS to 9.2.15 or 10.1.4; audit plugins and block untrusted redirect inputs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Plugins can reset retry counter to bypass redirect limits, enabling amplified SSRF to probe internal services, exfiltrate data, or reach restricted backends.
Patch when possible
- affected>= 8.0.0 and <= 8.1.9
- affected>= 9.0.0 and <= 9.2.14
- affected>= 10.0.0 and <= 10.1.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.