Apache Traffic Server: HPACK encoder desynchronizes from the decoder after a failed header encode
Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming the header block encoded successfully, so an encode failure leaves the encoder out of sync with the peer decoder and corrupts subsequent header blocks on the connection. 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.
CVE-2026-65100
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-65100
Apache Traffic Server
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Apache Software Foundation",
"product": "Apache Traffic Server",
"versions": [
{
"status": "affected",
"version": "8.0.0",
"versionType": "semver",
"lessThanOrEqual": "8.1.11"
},
{
"status": "affected",
"version": "9.0.0",
"versionType": "semver",
"lessThanOrEqual": "9.2.14"
},
{
"status": "affected",
"version": "10.0.0",
"versionType": "semver",
"lessThanOrEqual": "10.1.3"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-65100
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #5737 · Revision 1
- Added to Heist Feed
- Publisher date