High severity · published Jul 29, 2026
CVE-2026-58153
Apache Traffic Server: HTTP/2 to HTTP/1 conversion forwards origin trailers to clients unsafely
8.3
CVSS
0.6%
EPSS
No
On KEV
Description
Apache Traffic Server forwards HTTP/2 origin trailers to HTTP/1 clients without proper chunked framing when converting HTTP/2 to HTTP/1.
This issue affects Apache Traffic Server: 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AT
Apache Traffic Server · Apache Software Foundation
10.0.0 through 10.1.3 · source: vendor
TS
Traffic Server · Apache
10.0.0 before 10.1.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58153
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-58153
Vendor Advisory
https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d
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