Apache HTTP Server: mod_auth_digest reauthentication attack
Published Oct 1, 2026
7.5
HIGHCVSS 3.1
EPSS 0.61%
Description
Missing authentication checks in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause a denial of service (forced re-authentication) via forged Authorization headers when Digest authentication is enabled with AuthDigestNcCheck .
Users are recommended to upgrade to version 2.4.69, which fixes this issue.
Affected products
-
- Version 2.4.0StatusaffectedConstraints<=2.4.68
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | unaffected |
|
- ≥ 2.4.0 · < 2.4.69
No data.
Red Hat Hardened Images
httpd-main-2.4.69-1.hum1
Fixed · RHSA-2026:74858
Red Hat Enterprise Linux 10
httpd
Affected
Red Hat Enterprise Linux 6
httpd
Not affected
Red Hat Enterprise Linux 7
httpd
Affected
Red Hat Enterprise Linux 8
httpd:2.4/httpd
Affected
Red Hat Enterprise Linux 9
httpd
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Hardened Images | httpd-main-2.4.69-1.hum1 | Fixed | RHSA-2026:74858 |
| Red Hat Enterprise Linux 10 | httpd | Affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 7 | httpd | Affected | n/a |
| Red Hat Enterprise Linux 8 | httpd:2.4/httpd | Affected | n/a |
| Red Hat Enterprise Linux 9 | httpd | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
To mitigate this issue, disable nonce-count verification by setting `AuthDigestNcCheck Off` within the relevant configuration context in `/etc/httpd/conf/httpd.conf` or `/etc/httpd/conf.d/`: AuthDigestNcCheck Off Alternatively, if Digest authentication is not required, disable `mod_auth_digest` by commenting out the corresponding `LoadModule auth_digest_module` line in `/etc/httpd/conf.modules.d/00-base.conf`. After modifying the configuration, reload the service: systemctl reload httpd Caveats: Disabling `AuthDigestNcCheck` removes server-side nonce-count checking, reducing replay protection for Digest authentication. Warning: Reloading the httpd service can momentarily disrupt in-flight connections.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Oct 1, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.61% (0.00606) | 47.15th | v5 (v2026.06.15) |
| Oct 2, 2026 | 0.45% (0.00448) | 36.71th | v5 (v2026.06.15) |
References (6)
- http://www.openwall.com/lists/oss-security/2026/10/01/15 Mailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2026-48005 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2544861 Issue Tracking
- https://httpd.apache.org/security/vulnerabilities_24.html vendor-advisoryVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-48005
- https://www.cve.org/CVERecord?id=CVE-2026-48005
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2026/10/01/15 | Mailing ListThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2026-48005 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2544861 | Issue Tracking | |
| https://httpd.apache.org/security/vulnerabilities_24.html | vendor-advisoryVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-48005 | ||
| https://www.cve.org/CVERecord?id=CVE-2026-48005 |
Change history (0)
No recorded changes yet.