Apache Traffic Server: ESI plugin allows uncontrolled recursion and server-side request forgery
Published Jul 29, 2026
8.2
HIGHCVSS 4.0
EPSS 0.66%
Description
The Apache Traffic Server ESI plugin can recurse without bound and fetch attacker-controlled URLs.
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.
Affected products
-
- Version 10.0.0StatusaffectedConstraints<=10.1.3
- Version 8.0.0StatusaffectedConstraints<=8.1.11
- Version 9.0.0StatusaffectedConstraints<=9.2.14
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server | unaffected |
|
- ≥ 8.0.0 · ≤ 8.1.9
- ≥ 9.0.0 · < 9.2.15
- ≥ 10.0.0 · < 10.1.4
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Jul 29, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Jul–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.66% (0.00664) | 49.90th | v5 (v2026.06.15) |
| Jul 29, 2026 | 0.44% (0.00441) | 36.15th | v5 (v2026.06.15) |
References (1)
- https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d vendor-advisoryMailing ListVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d | vendor-advisoryMailing ListVendor Advisory |
Change history (0)
No recorded changes yet.