All vulnerabilities
CVE-2026-112381

Apache Traffic Server: Nullptr dereference in net_write_io on a POST half-close with chunked response

Apache Software Foundation Apache Traffic Server
Open in ThreatlineRecord JSON
CVSS
5.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 16% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published21 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

Apache Traffic Server can crash with a null pointer dereference when a client POST request is torn down via half-close while a chunked origin response is being reparsed from a reentrant write-ready callback, a timing-dependent race introduced by the CVE-2021-32564 flow-control backports.

This issue affects Apache Traffic Server: 9.2.15, 10.1.4, 10.2.0.

Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

Text from CVE List

Affected versions 3

  • Apache Traffic Serveraffected: 9.2.15CVE List
  • Apache Traffic Serveraffected: 10.1.4CVE List
  • Apache Traffic Serveraffected: 10.2.0CVE List

References 1