CVE-2026-34355
Apache HTTP Server: mod_proxy_html buffer overflow
At a glance
- Severity
- HIGH 7.5
- EPSS
- EPSS 1.16 % · percentile 67 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- apache
- NVD status
- Modified
Description
A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted backend. Users are recommended to upgrade to version 2.4.68, which fixes this issue.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2026-35097
- GCVE · GCVE-0-2026-34355
CERT-FR advisories
- CERTFR-2026-AVI-1256 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0710 — Multiples vulnérabilités dans Apache HTTP Server · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*≥ 2.4.0 < 2.4.68
Affected products
| Product | Versions |
|---|---|
| Apache Software Foundation · Apache HTTP Server | affected 2.4.0 ≤ 2.4.67 |
References
- https://httpd.apache.org/security/vulnerabilities_24.html
- http://www.openwall.com/lists/oss-security/2026/06/08/6
- https://access.redhat.com/security/cve/CVE-2026-34355
- https://bugzilla.redhat.com/show_bug.cgi?id=2486414
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34355.json
- https://access.redhat.com/errata/RHSA-2026:56868
- https://access.redhat.com/errata/RHSA-2026:47046
- https://access.redhat.com/errata/RHSA-2026:34109
- https://access.redhat.com/errata/RHSA-2026:42828
- https://access.redhat.com/errata/RHSA-2026:67152
- https://access.redhat.com/errata/RHSA-2026:66323
- https://access.redhat.com/errata/RHSA-2026:62165
- https://access.redhat.com/errata/RHSA-2026:41906
- https://access.redhat.com/errata/RHSA-2026:25042
- https://access.redhat.com/errata/RHSA-2026:53371
- https://access.redhat.com/errata/RHSA-2026:56869
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |