# CVE-2026-68763: Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset

> CVE-2026-68763: Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-68763
Last updated: 2026-08-27T13:02:31Z

- Published: 2026-08-25 22:00 UTC · Updated: 2026-08-27 13:02 UTC · Assigner: apache
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.74%, 54th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-400

## Description

Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog tracking when a stream is reset This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.39 through 9.0.120. The following versions were EOL at the time the CVE was created but are  known to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.

## Affected vendors and products

- Apache Software Foundation: Apache Tomcat

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-68763)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-68763)
- [https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzl](https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzl)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-68763 · Markdown: https://rewindex.com/cve/CVE-2026-68763.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-68763 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:20.697Z