CVE-2026-93546

Apache Http Server: integer overflow can lead to denial of service

Risk score: 70/100
CVSS: 8.8 v3.1
Exploit chance (30 days): 0.4%
Published: 1 Oct 2026

Open in the live forecast Today's forecast

What to know

What it is: Integer overflow in mod_dav_fs in Apache HTTP Server through 2.4.68 allows an authenticated WebDAV client with write access to crash worker processes and persistently corrupt a directory's property database via PROPPATCH requests declaring many XML namespaces.
Affected: Apache Http Server
Fix: Apply the vendor's security update; see the linked advisory.
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-2026-93546: Integer overflow can lead to denial of service (CVSS 8.8 · EPSS 0%)
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

Fix: Apply the vendor's security update; see the linked advisory.

Who is exposed: Apache Http Server

Where it stands

No known exploitation

Connects to

Same weakness: Integer overflow (CWE-190). 125 other warnings in 30 days
Same product: Earlier Apache Http Server warnings. 16 in the last 90 days

Why it is Amber

CVSS 8.8 high
On your watchlist: apache http server

References

Original description

Integer overflow in mod_dav_fs in Apache HTTP Server through 2.4.68 allows an authenticated WebDAV client with write access to crash worker processes and persistently corrupt a directory's property database via PROPPATCH requests declaring many XML namespaces.

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