USN-8589-1: Apache HTTP Server vulnerabilities

unknownCVE-2026-29167 CVE-2026-29170 CVE-2026-33006

It was discovered that Apache HTTP Server's mod_ldap module incorrectly handled memory when processing per-directory configurations. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-29167) It was discovered that Apache HTTP Server's mod_proxy_ftp module incorrectly handled HTML generation for FTP directory listings. A remote attacker could possibly use this issue to inject arbitrary web script or HTML. (CVE-2026-29170) Nitescu Lucian discovered that Apache HTTP Server's mod_auth_digest module was vulnerable to a timing attack. A remote attacker could possibly use this issue to bypass Digest authentication. (CVE-2026-33006)

CSIRTS triage

vendor: Apache product: Apache HTTP Server Remote code execution Denial of service Authentication bypass

What: Apache HTTP Server has vulnerabilities in its modules that could allow remote code execution, denial of service, or authentication bypass.
Who is affected: Deployments of Apache HTTP Server with the affected modules.
Urgency: Remediation is urgent due to the potential for remote code execution and denial of service.
Action: Apply the latest patches for Apache HTTP Server.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-22
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8589-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-291670.69% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all scored CVEs.
Low exploitation riskCVE-2026-291700.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all scored CVEs.
Low exploitation riskCVE-2026-330060.56% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-29167	coverage & exploitation status	NVD · CVE.org
CVE-2026-29170	coverage & exploitation status	NVD · CVE.org
CVE-2026-33006	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Oracle Solaris third-party components: Multiple vulnerabilitiescert-bund
high[UPDATE] [high] Apache HTTP Server: Multiple vulnerabilitiescert-bund
high[UPDATE] [high] Apache HTTP Server: Multiple vulnerabilitiescert-bund
high[NEW] [high] Oracle Communications: Multiple vulnerabilitiescert-bund
unknownNCSC-2026-0256 [1.00] [M/H] Vulnerabilities fixed in Oracle Communicationsncsc-nl
unknownUSN-8516-1: Apache HTTP Server vulnerabilitiesubuntu
mediumCVE-2026-29170: Apache HTTP Server: mod_proxy_ftp XSSmsrc
highCVE-2026-29167: Apache HTTP Server: mod_ldap per-dir use-after-freemsrc