CVE-2026-77762

LOWCVSS 8.1 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat allows an attacker to inject trailer fields into another HTTP/2 request. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.39 through 9.0.121. 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 11.0.26, 10.1.60, 9.0.122, which fix the issue.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-362

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Peaked 1d ago at 2 mentions (2026-09-23); latest day: 1
  • 3 total mentions across 2 days

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-09-23: 2Mentions · 2026-09-24: 109-2309-24
Referenced assets3 URLs
Full discourse3 posts
  • Kazuki Omo@omokazuki

    Tomcatの脆弱性(Critical: CVE-2026-76183, CVE-2026-86248, CVE-2026-86350, High: CVE-2026-75973, CVE-2026-77762, CVE-2026-77791, CVE-2026-78383, CVE-2026-78437, CVE-2026-79677, CVE-2026-87022, Medium: CVE-2026-73581, Low: CVE-2026-77756) https://security.sios.jp/vulnerability/tomcat-security-vulnerability-20260924/

    00012124
    372 followersView on X
  • zoomeyebot@zoomeyebot

    🚨 Apache Tomcat 11.0.26 Fixes HTTP/2 Trailer-Injection Race (CVE-2026-77762) Critical Vulnerability Alert! Apache Tomcat is affected by CVE-2026-77762. 🔍 Identify Targets via ZoomEye: Search Dork: app="Apache Tomcat" Exposure: 580.6k instances identified globally. ZoomEye Search Link: 👉 https://www.zoomeye.ai/searchResult?q=YXBwPSJBcGFjaGUgVG9tY2F0Ig%3D%3D #ApacheTomcat #CVE202677762 #HTTP2 #AppSec #VulnerabilityManagement

    0000032
    23 followersView on X
  • CVE@CVEnew

    CVE-2026-77762 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat allows an attacker to inject trailer fields… https://www.cve.org/CVERecord?id=CVE-2026-77762

    000001.4K
    58.1K followersView on X

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