6.3

CVE-2026-65100: apache software foundation apache traffic server Incorrect Behavior Order

CVSS: 6.3v4.0MediumModified
AliasesUBUNTU-CVE-2026-65100DEBIAN-CVE-2026-65100
Published 29-07-2026Last modified 01-10-2026
Open JSON

Vulnerability summary

CVE-2026-65100 is a medium (CVSS 6.3) Incorrect Behavior Order vulnerability in apache software foundation apache traffic server. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.6% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.58%
0%100%
Low · +0.23 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 29-07-2026
    PublishedVulnerability first disclosed.
  2. 01-10-2026
    Last modifiedVulnerability information updated.

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 8.1.11, 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.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.58%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

+0.23 pp

From 0.35% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.58%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apache1 product
  • traffic_server≥ 8.0.0, ≤ 8.1.9 | ≥ 9.0.0, < 9.2.15 | ≥ 10.0.0, < 10.1.4
Apache software foundation1 product
Debian1 product
  • trafficserverAll versions (No fix recorded)
Ubuntu1 product
  • trafficserverAll versions (No fix recorded)

4 vendors · 4 products

References

4 links