# CVE-2026-58183: Apache Traffic Server denial of service in prefetch plugin

Source: https://junglewise.ai/threats/cve-2026-58183-apache-traffic-server-denial-of-service-in-prefetch-plugin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-29. Updated: 2026-07-29  
License: CC BY 4.0 with a link back

CVE-2026-58183 · Severity: medium · CVSS 5.9 · Published 2026-07-29

Apache Traffic Server, a high-performance caching proxy used to speed up web content delivery, contains a vulnerability in its prefetch plugin. An attacker can send specially crafted input that causes the plugin to crash, potentially leading to a denial-of-service condition. This could disrupt website availability and impact user experience by slowing down content delivery. Organizations using the affected versions should upgrade to the latest patched releases to ensure service stability.

Technologies: [Apache Traffic Server](https://junglewise.ai/threats/technologies/traffic-server). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2026-58183 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58183 being exploited in the wild.

**How severe is CVE-2026-58183?** Medium severity, with a CVSS score of 5.9, published 29 July 2026.

**Which products and versions are affected?** Apache Traffic Server 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, 10.0.0 through 10.1.3.

**Is there a fix for CVE-2026-58183?** A patch was published on 2026-07-29. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-58183 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-58183?** Check whether you run Apache Traffic Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability exists in the prefetch plugin of Apache Traffic Server due to improper input validation (CWE-20). An unauthenticated remote attacker can provide malicious input that triggers a crash in the plugin, resulting in a denial-of-service (DoS) for the affected service. The attack vector is network-based, though the CVSS assessment suggests a high complexity (AC:H), likely due to specific configuration requirements or timing needed to trigger the prefetch logic. The issue is resolved in versions 9.2.15 and 10.1.4.

## Affected products

- Apache Traffic Server 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, 10.0.0 through 10.1.3

## Timeline

- 2026-07-29: disclosed
- 2026-07-29: advisory
- 2026-07-29: patched

## References

- [https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d](https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d)

## Related threats

- [Apache Traffic Server null pointer dereference in request tear-down](https://junglewise.ai/threats/cve-2026-112381-apache-traffic-server-can-crash-with-a-null-pointer-dereference)
- [Apache Traffic Server connection stall with chunked transfer trailers dropped](https://junglewise.ai/threats/cve-2026-111817-apache-traffic-server-can-stall-a-chunked-transfer-that-it)
- [Apache Traffic Server TLS session resumption bypass of client certificate verification](https://junglewise.ai/threats/cve-2026-111815-apache-traffic-server-can-resume-a-tls-session-across-sni)
- [Apache Traffic Server TLS session reuse with mismatched client certificates](https://junglewise.ai/threats/cve-2026-111814-apache-traffic-server-s-default-outbound-session-sharing-policy)
- [Apache Traffic Server origin_server_auth AWS request signing bypass](https://junglewise.ai/threats/cve-2026-111812-apache-traffic-server-s-origin-server-auth-plugin-lets-a-client)