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Intelligence for Africa and the Gulf

AEGLIX vulnerability intelligence

CVE-2026-33805

CRITICAL · CVSS 9.0 · Modified

Published: 2026-04-15 · Updated: 2026-10-26 · Source: NVD

Stored catalog record

Source record retrieved 2026-10-28T10:19:07.767287+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

Vulnerability overview

@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from. Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.

Patch review priority

Critical technical severity

  • CVSS is at least 9.0; exploitation is not established by severity alone.

FIRST EPSS: 0.44% · percentile 38.1 · score date 2026-10-27.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score
9.0 · CRITICAL
CVSS version
4.0
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses
CWE-444, CWE-644

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:a:fastify:fastify\/http-proxy:*:*:*:*:*:node.js:*:*

    Before (exclusive): 11.4.4

  • cpe:2.3:a:fastify:reply-from:*:*:*:*:*:node.js:*:*

    Before (exclusive): 12.6.2

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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