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CVE-2026-65100— Apache Traffic Server: HPACK encoder desynchronizes from the decoder after a failed header encode

Quick assessment

Affected
Apache Software Foundation Apache Traffic Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache traffic server是美国Apache基金会开源的一个高性能HTTP代理服务器。 Apache Traffic Server 8.0.0至8.1.9版本、9.0.0至9.2.14版本和10.0.0至10.1.3版本存在处理逻辑错误漏洞，该漏洞源于更新HTTP/2 HPACK动态表在确认头部块成功编码之前，编码失败导致编码器与解码器不同步，破坏后续头部块。

CVSS 4.8 · Medium EPSS 0.35% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
Apache Software Foundation Apache Traffic Server 8.0.0≤ 8.1.9 affected
9.0.0≤ 9.2.14 affected
10.0.0≤ 10.1.3 affected
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I. Basic Information for CVE-2026-65100

Vulnerability Information
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Vulnerability Title
Apache Traffic Server: HPACK encoder desynchronizes from the decoder after a failed header encode
Source: CVE Program / CVE List V5
Vulnerability Description
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 8.1.9, 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Traffic Server 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache traffic server是美国Apache基金会开源的一个高性能HTTP代理服务器。 Apache Traffic Server 8.0.0至8.1.9版本、9.0.0至9.2.14版本和10.0.0至10.1.3版本存在处理逻辑错误漏洞，该漏洞源于更新HTTP/2 HPACK动态表在确认头部块成功编码之前，编码失败导致编码器与解码器不同步，破坏后续头部块。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Traffic Server 8.0.0 ~ 8.1.9 -

II. Public POCs for CVE-2026-65100

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III. Intelligence Information for CVE-2026-65100

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Same Patch Batch · Apache Software Foundation · 2026-07-29 · 41 CVEs total

CVE-2026-33267 10.0 CRITICAL Apache Traffic Server: Untrusted @ headers can spoof ATS internal metadata
CVE-2026-57834 10.0 CRITICAL Apache Traffic Server: Malformed chunked message body allows request smuggling
CVE-2026-58150 10.0 CRITICAL Apache Traffic Server: HTTP/2 requests with Transfer-Encoding are not rejected, allowing r
CVE-2026-58162 10.0 CRITICAL Apache Traffic Server: Certifier plugin trusts client SNI when generating certificates
CVE-2026-58155 9.3 CRITICAL Apache Traffic Server: Header-name length truncation enables header aliasing and request s
CVE-2026-41920 9.3 CRITICAL Apache Traffic Server: SNI to Host header matching policy is not properly enforced
CVE-2026-58154 8.9 HIGH Apache Traffic Server: Memory-safety errors in MIME and header parsing
CVE-2026-58157 8.7 HIGH Apache Traffic Server: Improper server-session reuse can expose data across client connect
CVE-2026-58182 8.6 HIGH Apache Traffic Server: ts_lua plugin has initialization and resource-handling errors
CVE-2026-58153 8.3 HIGH Apache Traffic Server: HTTP/2 to HTTP/1 conversion forwards origin trailers to clients uns
CVE-2026-58159 8.2 HIGH Apache Traffic Server: Listener and ACL handling allow access-control bypass
CVE-2026-58184 8.2 HIGH Apache Traffic Server: header_rewrite plugin cookie handling can corrupt memory
CVE-2026-58188 8.2 HIGH Apache Traffic Server: Memory-safety and limit-bypass errors across experimental plugins
CVE-2026-22068 8.2 HIGH Apache Traffic Server: Regex mappings match with malicious domain names
CVE-2026-58177 8.1 HIGH Apache Traffic Server: Memory-safety and path-traversal errors in the Cripts framework
CVE-2026-58179 8.1 HIGH Apache Traffic Server: regex_remap plugin overflows the stack from attacker input
CVE-2026-58161 7.5 HIGH Apache Traffic Server: Memory-safety errors in TLS and SNI handling can crash the server
CVE-2026-58175 7.5 HIGH Apache Traffic Server: HostDB SRV handling leaks memory
CVE-2026-58178 7.5 HIGH Apache Traffic Server: ESI plugin allows uncontrolled recursion and server-side request fo
CVE-2026-58180 7.5 HIGH Apache Traffic Server: txn_box plugin overflows the stack from attacker input

Showing top 20 of 41 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Apache Traffic Server
Same vendor: Apache Software Foundation
Same weakness: CWE-696

V. Comments for CVE-2026-65100

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