CVE-2026-33857

MEDIUMNVD 5.35.3—Trending — Patch released this week

5.3

Out-of-bounds Read vulnerability in mod_proxy_ajp of

Apache HTTP Server.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVSS v3: 5.3
EG Score: 5.3(high)
EPSS: 44.7%
KEV: Not listed

Published

May 4, 2026

Last Modified

May 4, 2026

Advisory Details (1)

Auto-updated May 4, 2026

⚠️ Active exploitation confirmed. Patch available.

generic Patch Available🔴 Active Exploitation

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

https://httpd.apache.org/security/vulnerabilities_24.html

Vendor Advisories for CVE-2026-33857(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libapache2-mod-proxy-uwsgi (2.4.58-1ubuntu8.12) @ noble	2026-06-02	ubuntu
redhat	httpd:2.4-8100020260519200905.489197e6	2026-06-01	redhat
redhat	httpd-0:2.4.63-13.el10_2.1	2026-05-27	redhat
redhat	httpd-0:2.4.62-13.el9_8.1	2026-05-27	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-125Out-of-bounds Read

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

UbuntuUSN-8239-1LOW
Apache HTTP Server vulnerabilities

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:13 UTCepss_batch
2026-06-02 12:24 UTCEG score recompute
2026-06-02 12:24 UTCVendor advisory
2026-06-02 12:24 UTCGHSA enrichment
2026-06-01 13:52 UTCepss_batch
2026-06-01 13:52 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 10:03 UTCEG score recompute
2026-06-01 10:03 UTCVendor advisory
2026-06-01 10:03 UTCGHSA enrichment
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch

Frequently asked(5)

What is CVE-2026-33857?

CVE-2026-33857 is a medium vulnerability published on May 4, 2026. Out-of-bounds Read vulnerability in modproxyajp of Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

When was CVE-2026-33857 disclosed?

CVE-2026-33857 was first published in the National Vulnerability Database on May 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-33857 actively exploited?

CVE-2026-33857 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-33857?

CVE-2026-33857 has a CVSS v3 base score of 5.3 (NVD).

How do I remediate CVE-2026-33857?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33857, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-33857

Published

Last Modified

Advisory Details (1)

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

Vendor Advisories for CVE-2026-33857(4)

Patch Availability(4)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-33857?

Same vendor

Same CWE

CVE-2026-33857

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

📣 Vendor Advisories for CVE-2026-33857(4)

Patch Availability(4)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-33857?

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Advisory Details (1)

Vendor Advisories for CVE-2026-33857(4)

Frequently asked(5)

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