CVE-2026-63292

Apache Http Server: stack buffer overflow can lead to remote code execution

Risk score: 72/100
CVSS: 7.5 v3.1
Exploit chance (30 days): 0.9%
Published: 1 Oct 2026

Open in the live forecast Today's forecast

What to know

What it is: Stack-based buffer overflow in mod_vhost_alias in Apache Software Foundation Apache HTTP Server through 2.4.68 on all platforms allows a remote client to cause a denial of service or potentially execute arbitrary code via an HTTP request with a Host header exceeding 8192 bytes when VirtualDocumentRoot uses a hostname …
Affected: Apache Http Server before 2.4.69
Fix: Upgrade Apache Http Server to 2.4.69 or later.
Exploitation: No known exploitation

Story map

Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Apache Http Server: Red, act today. Use After Free vulnerability in Apache HTTP Server's mod_http2 via shared session->bbtmp re-entrancy This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

The flaws

CVE-2026-63292: Stack buffer overflow can lead to remote code execution (CVSS 7.5 · EPSS 1%)
CVE-2026-57941: Use-after-free (CVSS 9.8 · EPSS 1%)
CVE-2026-56154: Use-after-free (CVSS 9.8 · EPSS 1%)
CVE-2026-59797: Privilege escalation (CVSS 9.8 · EPSS 1%)

The fix

Upgrade Apache Http Server: 2.4.69 or later on your release line

Who is exposed: Apache Http Server

Where it stands

No known exploitation

Connects to

Same weakness: Stack buffer overflow (CWE-121). 195 other warnings in 30 days
Same product: Earlier Apache Http Server warnings. 16 in the last 90 days

Why it is Amber

CVSS 7.5 high
Remotely exploitable without logging in
On your watchlist: apache http server

References

Original description

Stack-based buffer overflow in mod_vhost_alias in Apache Software Foundation Apache HTTP Server through 2.4.68 on all platforms allows a remote client to cause a denial of service or potentially execute arbitrary code via an HTTP request with a Host header exceeding 8192 bytes when VirtualDocumentRoot uses a hostname format specifier and LimitRequestFieldSize is raised above the default. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Last activity 1 Oct 2026. Patch Forecast updates every hour.