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TL;DR
Apache released HTTP Server 2.4.71 on November 11 to fix CVE-2026-119618, a critical mod_http2 flaw that Apache says can lead to remote code execution. The upstream affected range is 2.4.55–2.4.70, but exposure also depends on HTTP/2 being enabled; administrators should check their distribution’s advisory and install its fixed package.
Apache released HTTP Server 2.4.71 on November 11 to address CVE-2026-119618, a critical flaw in the mod_http2 module that the project says can lead to remote code execution. Administrators should check both their server version and whether HTTP/2 is enabled; systems using affected versions with HTTP/2 active may be exposed to attacks from an unauthenticated remote user, according to Red Hat.
Apache identifies HTTP Server versions 2.4.55 through 2.4.70 as affected and lists 2.4.71 as the fixed upstream release. The standalone mod_h2 project on GitHub is also affected in versions 2.0.8 through 2.0.42. Apache describes the flaw as a shared-resource synchronization problem in the mod_http2 function assign_headers(), with the advisory title referring to heap corruption and RCE.
Version numbers alone do not establish whether a server is exposed. Red Hat says the issue affects servers with HTTP/2 (h2 or h2c) enabled through the Protocols directive; servers serving only HTTP/1.1 are not affected. Apache’s documented default is “Protocols http/1.1,” but local configuration can differ, so administrators should inspect the active configuration rather than assume the default is in use.
Red Hat says a remote attacker able to reach an affected web server could exploit the flaw to execute commands without authentication, and assigns it a CVSS 3.1 score of 9.8. That is Red Hat’s rating; the National Vulnerability Database had not published its own score as of November 12, according to the source report. Apache credits Anthropic’s OSS Scanner and two Google Cloud Vulnerability Research researchers with finding the issue.
Check Apache HTTP/2 Exposure CVE-2026-119618
Apache says this critical mod_http2 flaw can lead to remote code execution. Exposure depends on the server package, active HTTP/2 settings, and network reachability.
Check the exposure conditions
A version match alone does not confirm exposure.
Check your Apache HTTP Server or standalone mod_h2 version and consult your distribution’s advisory.
Review the Protocols directive for HTTP/2 (h2 or h2c); do not assume the documented default is active.
Red Hat says an attacker able to reach an affected server could exploit the flaw without authentication.
What the checks mean
- Affected package version
- HTTP/2 enabled
- Server reachable by an attacker
- Serving only HTTP/1.1
- RHEL 8 and earlier
Patch through your vendor
Distribution packages can use their own version labels.
Apache HTTP Server
Apache lists 2.4.71 as the fixed release.
Fixed packages shipped
Red Hat shipped fixes for RHEL 9 and 10 on November 11.
Status varies by branch
Bookworm and trixie were listed as vulnerable; fixed 2.4.71-1 had reached sid.
Exploit status remains uncertain
Red Hat said public research demonstrated a reliable exploit. Wiz reported no known exploit or in-the-wild activity at publication. Exploit research does not confirm attacks.
Why HTTP/2 Configuration Matters
The practical risk depends on a combination of software version, HTTP/2 configuration and network reachability. A server inside the affected version range but serving only HTTP/1.1 is not affected under Red Hat’s description. Conversely, administrators cannot rely on a version check alone if their distribution supplies patched packages under its own versioning scheme.
Red Hat says public research has demonstrated a reliable exploit against a default-configured server with mod_http2 enabled. Wiz reported on November 11 that it had found no reports of exploitation in the wild and no exploit available at the time of publication. CISA’s Known Exploited Vulnerabilities catalog did not list the CVE when checked on November 12, but the catalog edition cited in the source predates public disclosure. These points do not establish that attacks are occurring, but they support treating patching as urgent.
Wiz reported that 64% of cloud environments in its data had resources vulnerable to the CVE and that 51% had publicly exposed instances. Wiz cautioned that the figures do not account for configuration; they are measurements from its own customer data, not a count of confirmed exploitable servers. They indicate potential reach, not verified exposure across the internet.
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Patch Timeline and Vendor Status
Apache’s security team received a report from Anthropic on October 26, according to the project. Google Cloud Vulnerability Research submitted its report on November 3. Apache released 2.4.71 on November 11, making the interval from the first report to the upstream patch 16 days. The CVE number was reserved on October 30 and the public record went live on November 11.
Linux distribution users should follow their vendor’s security notice and install the vendor package, rather than relying only on the upstream version number. Red Hat shipped fixed packages on November 11, including RHSA-2026:98981 for RHEL 9 and RHSA-2026:98978 for RHEL 10. Red Hat rates the flaw Critical overall, but Important for RHEL 9 and 10, citing allocator differences that it says make exploitation more complex. Red Hat says RHEL 8 and earlier are not affected; its JBoss Core Services and Hardened Images were still listed as affected in the status checked November 12.
Debian’s status differed by branch at that time: bookworm and trixie were listed as vulnerable, while fixed package 2.4.71-1 had reached sid, the unstable branch. The source report found no published Ubuntu or SUSE advisory for this CVE as of November 12. That absence should not be read as confirmation that a product is unaffected; users should check for later vendor notices.
““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
Public information available on November 12 did not resolve whether attackers had used the flaw. Wiz said it knew of no exploit or in-the-wild activity at publication, while Red Hat said public research had demonstrated a reliable exploit. Red Hat did not name the researchers or provide details in the cited statement, and the source report found no public exploit code linked from the advisories. Exploitability research is not proof of criminal use.
CISA’s catalog status was also not a current test for exploitation: the cited edition was published before the CVE became public. Vendor coverage may change after the status check, and the source report had not found published Ubuntu or SUSE advisories at that time. Administrators should confirm their current distribution status directly with the vendor.
Verify, Patch and Recheck Advisories
Administrators should identify the Apache HTTP Server or standalone mod_h2 package in use, check the active Protocols settings, and consult the relevant vendor advisory. If an affected installation is present, apply Apache 2.4.71 or the vendor’s fixed package as soon as it is available for that system. Where patching cannot happen immediately, administrators should review whether HTTP/2 can be disabled temporarily under their operational requirements; the source material does not prescribe this as a universal workaround.
Teams should also recheck vendor notices and trusted security updates for changes to affected-product lists, package availability and exploitation status. The next key developments are updated distribution advisories and any substantiated reports about attacks or publicly released exploit research. Apache’s advisory does not provide public exploit details, and the available information does not establish a confirmed in-the-wild attack.
Key Questions
Which Apache HTTP Server versions are affected?
Apache lists 2.4.55 through 2.4.70 as affected upstream versions. Apache 2.4.71 contains the fix. Distribution packages may use different version labels, so check the relevant vendor advisory as well.
Does an affected version mean my server is exposed?
Not necessarily. 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 active configuration; do not assume the documented default applies to your installation.
What should Linux distribution users install?
Install the fixed package provided by your distribution and follow its advisory. Red Hat shipped fixes on November 11. On November 12, Debian listed bookworm and trixie as vulnerable and had fixed package 2.4.71-1 in sid. Vendor status can change, so check for current notices.
Has CVE-2026-119618 been exploited?
The available reports did not confirm exploitation in the wild. Wiz said it knew of no reports at publication, while Red Hat said public research had demonstrated a reliable exploit. The source material does not establish that attackers have used it.
Source: ThorstenMeyerAI.com
