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TL;DR
Apache fixed CVE-2026-119618, a critical mod_http2 flaw that can lead to remote code execution, in Apache HTTP Server 2.4.71, released November 11, 2026. Administrators should check whether HTTP/2 is enabled and promptly install the upstream release or a fixed package from their Linux vendor; exploitation in the wild was not confirmed in the cited checks, while Red Hat said public research demonstrated a reliable exploit.
The Apache HTTP Server project released version 2.4.71 on November 11 to fix CVE-2026-119618, a critical vulnerability in its mod_http2 module that Apache says can lead to remote code execution. Administrators should check their installed version and configuration: the issue affects listed releases from 2.4.55 through 2.4.70, but exposure requires HTTP/2 to be enabled.
Apache describes the flaw as a concurrent-execution vulnerability in the assign_headers() function, with heap corruption and possible remote code execution. In its advisory, the project says the issue can lead to RCE. Red Hat explains that a thread-safety flaw could let one thread modify memory belonging to another, corrupting server memory. Red Hat says a remote attacker able to reach an affected server could use the flaw to execute arbitrary commands without authentication. That is the vendor’s assessment; Apache’s advisory does not provide exploit instructions.
The affected upstream versions are Apache HTTP Server 2.4.55 through 2.4.70, plus standalone mod_h2 releases 2.0.8 through 2.0.42 from GitHub. Apache 2.4.71 is the upstream fix. Red Hat said it shipped fixed packages on November 11, including updates for RHEL 9 and 10. Its assessment says RHEL 8 and earlier are not affected, while Red Hat JBoss Core Services and Red Hat Hardened Images were still listed as affected on November 12.
Distribution status differed at that date. Debian listed stable bookworm and trixie as vulnerable, with fixed package 2.4.71-1 available in unstable, sid. The source report found no published Ubuntu or SUSE advisory for this CVE at the time it checked. Administrators using distribution packages should follow the relevant vendor advisory and package version, rather than assuming that installing the upstream tarball is the right update path.
CVE-2026-119618 What Apache HTTP/2 Users Should Do Now
Apache fixed a critical mod_http2 flaw that can lead to remote code execution. Check both your server version and whether HTTP/2 is enabled, then apply the appropriate fix.
Check and patch affected servers
Affected upstream releases are Apache HTTP Server 2.4.55–2.4.70 and standalone mod_h2 2.0.8–2.0.42. Exposure requires HTTP/2 to be enabled.
Find Apache HTTP Server and standalone mod_h2 versions across your systems.
Check whether HTTP/2 is enabled, especially on internet-facing servers.
Upgrade to Apache 2.4.71 or follow your operating-system vendor’s package instructions.
Follow distribution-specific updates
Package status differed in the November 12 report. Check current vendor notices before choosing an update path.
| Vendor or product | Status in the report |
|---|---|
| Red Hat RHEL 9 and 10 | Fixed packages shipped November 11 |
| Red Hat RHEL 8 and earlier | Assessed as not affected |
| Red Hat JBoss Core Services and Hardened Images | Still listed as affected |
| Debian stable bookworm and trixie | Listed as vulnerable |
| Debian unstable, sid | Fixed package 2.4.71-1 available |
| Ubuntu and SUSE | No published advisory found in the report’s check |
Exploit reports are not confirmation of attacks
The available accounts describe different evidence, and do not establish that attackers exploited the flaw in the wild.
- Wiz reported no known in-the-wild exploitation on November 11.
- The CVE was absent from the CISA catalog version checked on November 12, which predated public disclosure.
- Public research demonstrated a reliable exploit against a default-configured server with mod_http2 enabled.
- This does not confirm that attacks have occurred.
Why HTTP/2 Configuration Matters
The vulnerability matters because a flaw in a widely used web server could, under the conditions described by vendors, allow a remotely reachable attacker to run commands on a server. A successful compromise could put hosted services and data at risk. Risk depends on both software version and configuration: Red Hat says servers with HTTP/2 enabled through the Protocols directive are affected, while servers serving only HTTP/1.1 are not.
Wiz reported that 64% of cloud environments in its customer data had resources it considered vulnerable and 51% had publicly exposed instances. Wiz cautioned that its figures did not account for configuration, so they are not counts of confirmed exploitable servers and should not be treated as prevalence estimates for all cloud systems. They do point to the value of checking internet-facing systems and verifying their actual HTTP/2 settings.
There is also a gap between reports about exploitation. Wiz said on November 11 that it had found no reports of exploitation in the wild. The CVE was not on CISA’s Known Exploited Vulnerabilities catalog when checked November 12, although the cited catalog version predated public disclosure. Red Hat, meanwhile, said public research had demonstrated a reliable exploit against a default-configured server with mod_http2 enabled. Those statements do not establish that attackers are using the flaw in the wild, but they support treating patching as urgent.
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From Reports to Apache 2.4.71
Apache credited Anthropic’s OSS Scanner and two researchers from Google Cloud Vulnerability Research with finding the issue. According to the source report, Anthropic sent its report on October 26 and the Google Cloud researchers reported the flaw on November 3. The CVE number was reserved on October 30. Apache published the fix in the 2.4.x branch as version 2.4.71 on November 11.
The vulnerability sits in mod_http2, which handles HTTP/2 requests. HTTP/2 allows multiple requests to share a connection, and Apache processes those requests using multiple threads. The reported flaw involves improper synchronization when those threads use shared resources. Apache’s configuration documentation says its default Protocols setting is http/1.1; HTTP/2 must be enabled in configuration. Administrators should verify their deployment rather than infer exposure from the product name alone.
Apache’s advisory and CVE record identify the affected versions and fix, while vendor advisories provide distribution-specific impact and package information. Red Hat assigned a CVSS 3.1 score of 9.8 out of 10; the source report said the National Vulnerability Database had not published its own score by November 12. These scores and vendor ratings are assessments, not evidence that a particular server has been compromised.
““Concurrent Execution using Shared Resource with Improper Synchronization vulnerability in Apache HTTP Server’s mod_http2 in assign_headers() can lead to RCE.””
— Apache HTTP Server project
Exploit Activity Remains Unverified
Whether attackers have exploited CVE-2026-119618 in the wild was not established in the cited checks as of November 12. Wiz reported no known exploitation, and the CVE was absent from the CISA catalog version checked. That catalog had been published before the CVE became public, limiting what its omission shows. Red Hat’s claim about a reliable exploit refers to public research, but the source material does not identify that research or say that attacks have occurred.
Package status may also change after the November 12 snapshot. The source report found Debian’s stable branches still vulnerable and no published Ubuntu or SUSE advisory at that time; readers should check current vendor notices. The exact exposure of any given server cannot be determined from its version alone without checking whether HTTP/2 is enabled and how the service is deployed.
Check Services and Apply Vendor Fixes
Administrators should inventory Apache HTTP Server and standalone mod_h2 installations, identify versions in the affected ranges, and check whether HTTP/2 is enabled. Upgrade to Apache 2.4.71 or install the fixed package supplied by the operating-system vendor, following that vendor’s instructions. For systems that cannot be patched immediately, confirm the actual protocol configuration and consult the vendor’s mitigation guidance; do not treat an HTTP/1.1-only configuration as a substitute for applying the fix when an update is available.
Teams should also monitor Apache, Linux-distribution and security-agency advisories for updated package status, severity assessments and confirmed exploitation reports. At the time covered by the source material, there was no confirmed in-the-wild exploitation report, but Red Hat’s account of reliable exploit research means organizations should not wait for an entry in CISA’s catalog before addressing exposed, affected servers.
Key Questions
Which Apache versions are affected?
Apache lists HTTP Server 2.4.55 through 2.4.70 as affected. The standalone mod_h2 GitHub releases 2.0.8 through 2.0.42 are also listed. Apache HTTP Server 2.4.71 contains the upstream fix.
Does the flaw affect every Apache server?
No. Red Hat says the issue affects servers with HTTP/2 enabled through the Protocols directive. Servers serving only HTTP/1.1 are not affected according to Red Hat. Check the server’s configuration and version to assess exposure.
Has CVE-2026-119618 been exploited?
The cited sources did not confirm exploitation in the wild as of November 12, 2026. Wiz reported no known in-the-wild exploitation, while Red Hat said public research had demonstrated a reliable exploit. Those reports indicate potential exploitability but do not confirm attacks against deployed servers.
What should administrators do now?
Check affected versions and HTTP/2 settings, then install Apache 2.4.71 or the applicable fixed vendor package. If using a Linux distribution package, consult the distribution’s current advisory because availability differed by vendor and release.
Source: ThorstenMeyerAI.com
