CVE-2026-111810: Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @ header they strip, so a request carrying many such headers makes the proxy write far more log data than the request contains
CVE-2026-111810 key facts
- CISA KEV
- Not listed (catalogue checked )
- Highest advisory rating
- High
- CVSS base score
- 8.7 (Apache), 7.5 (Red Hat)
- Weakness
- CWE-770
- Fixed releases
- Apache: 9.2.16, 10.1.5, 10.2.1
- Red Hat: 9.2.16, 10.1.5, 10.2.1
- Listed by VulniPulse
- Record changed
Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-111810; each belongs to its advisory, not to every product listed. How records are collected and checked.
How do I fix CVE-2026-111810?
Upgrade to a fixed release named by the vendor:
- Apache: 9.2.16, 10.1.5, 10.2.1
- Red Hat: 9.2.16, 10.1.5, 10.2.1
- Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue. (Apache)
- rate-limit or cap diagnostic logging of stripped headers; restrict log verbosity; monitor disk usage (Red Hat)
Vendor advisories for CVE-2026-111810
Apache
1 advisory- Advisory severityHigh8.7
High [CVE-2026-111810] Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @ header they strip, so a request carrying many such headers makes the proxy write far more log data than the request contains
CVE-2026-111810Source published Source updated
Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @ header they strip, so a request carrying many such headers makes the proxy write far more log data than the request contains. This issue affects Apache Traffic Server: 9.2.15, 10.1.4, 10.2.0. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
- Affected products in this advisory
- Apache Traffic Server
- Source-reported affected versions
- 9.2.15
- 10.1.4
- 10.2.0
- Source-reported fixed versions
- 9.2.16
- 10.1.5
- 10.2.1
- Mitigation guidance
- Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
Red Hat
1 advisory- Advisory severityHigh7.5
High [CVE-2026-111810] Denial of Service via unthrottled logging of stripped headers
CVE-2026-111810Source published Source updated
Denial of Service via unthrottled logging of stripped headers. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770.
- Related products — impact not confirmed
- No product details extracted. Check the source bulletin.
- Source-reported affected versions
- 9.2.15
- 10.1.4
- 10.2.0
- Source-reported fixed versions
- 9.2.16
- 10.1.5
- 10.2.1
- Mitigation guidance
- rate-limit or cap diagnostic logging of stripped headers; restrict log verbosity; monitor disk usage
References
More Apache advisories
CVE-2026-112381Oct 21, 2026Apache Traffic Server can crash with a null pointer dereferenceCVE-2026-111817Oct 21, 2026Apache Traffic Server can stall a chunked transferCVE-2026-111812Oct 21, 2026Apache Traffic Server's origin_server_auth plugin lets a client force signingCVE-2026-111811Oct 21, 2026Apache Traffic Server's experimental tsmemcache pluginCVE-2026-111809Oct 21, 2026Apache Traffic ServerCVE-2026-111815Oct 21, 2026Apache Traffic Server can resume a TLS session across SNI virtual hosts
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