CVE-2026-111804: Apache Traffic Server's experimental wasm plugin has a use-after-free in its transaction-close handler and forwards unvalidated guest-supplied metric IDs to the internal stats API
CVE-2026-111804 key facts
- CISA KEV
- Not listed (catalogue checked )
- Highest advisory rating
- High
- CVSS base score
- 8.8 (Apache), 8.2 (Red Hat)
- Weakness
- CWE-825
- Fixed releases
- Apache: 10.1.5, 10.2.1
- Red Hat: 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-2026-111804; each belongs to its advisory, not to every product listed. How records are collected and checked.
How do I fix CVE-2026-111804?
Upgrade to a fixed release named by the vendor:
- Apache: 10.1.5, 10.2.1
- Red Hat: 10.1.5, 10.2.1
- Users are recommended to upgrade to version 10.1.5 or 10.2.1, which fix the issue. (Apache)
- Do not enable the experimental WASM plugin on affected instances; upgrade to Apache Traffic Server 10.1.5 or 10.2.1 (or a later fixed release) when available in your stream. (Red Hat)
Vendor advisories for CVE-2026-111804
Apache
1 advisory- Advisory severityHigh8.8
High [CVE-2026-111804] Apache Traffic Server's experimental wasm plugin has a use-after-free in its transaction-close handler and forwards unvalidated guest-supplied metric IDs to the internal stats API
CVE-2026-111804Source published Source updated
Apache Traffic Server's experimental wasm plugin has a use-after-free in its transaction-close handler and forwards unvalidated guest-supplied metric IDs to the internal stats API. This issue affects Apache Traffic Server: from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 10.1.5 or 10.2.1, which fix the issue.
- Affected products in this advisory
- Apache Traffic Server
- Source-reported affected versions
- 10.0.0 through 10.1.4
- Source-reported fixed versions
- 10.1.5
- 10.2.1
- Mitigation guidance
- Users are recommended to upgrade to version 10.1.5 or 10.2.1, which fix the issue.
Red Hat
1 advisory- Advisory severityHigh8.2
High [CVE-2026-111804] Denial of Service via use-after-free in WASM plugin
CVE-2026-111804Source published Source updated
Denial of Service via use-after-free in WASM plugin. Red Hat rates this important (CVSS 8.2). Weakness: CWE-825.
- Related products — impact not confirmed
- No product details extracted. Check the source bulletin.
- Source-reported affected versions
- 10.0.0
- 10.1.4
- 10.2.0
- Source-reported fixed versions
- 10.1.5
- 10.2.1
- Mitigation guidance
- Do not enable the experimental WASM plugin on affected instances; upgrade to Apache Traffic Server 10.1.5 or 10.2.1 (or a later fixed release) when available in your stream.
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-2026-111810Oct 21, 2026Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line
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