October 30, 2026

CVE Watchtower

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CVE-2026-58155NVD

Vulnerability Summary

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.
Severity Level
CRITICAL(9.2)
Published Date
Jul 29, 2026
Last Modified
Oct 1, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.54%Probability
Root Weakness (CWE)
CWE-444: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v4.0 Base Metrics — Score 9.2 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)None
Integrity (Vulnerable System)High
Availability (Vulnerable System)None
Confidentiality (Subsequent System)None
Integrity (Subsequent System)High
Availability (Subsequent System)None
CVSS v3.1 Base Metrics — Score 9.3 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityHigh
AvailabilityNone

Affected & Patched Versions

Affected Versions
  • Apache Software Foundation Apache Traffic Server >= 8.0.0 and <= 8.1.11
  • Apache Software Foundation Apache Traffic Server >= 9.0.0 and <= 9.2.14
  • Apache Software Foundation Apache Traffic Server >= 10.0.0 and <= 10.1.3
Patched Versions
  • Apache Software Foundation Apache Traffic Server 8.1.11
  • Apache Software Foundation Apache Traffic Server 9.2.14
  • Apache Software Foundation Apache Traffic Server 10.1.3
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References