CVE-2026-33805 (GCVE-0-2026-33805)

Vulnerability from cvelistv5 – Published: 2026-04-15 10:13 – Updated: 2026-06-30 12:07
VLAI
Title
@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers
Summary
@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.
Severity
9 (Critical)
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
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-644 - Improper Neutralization of HTTP Headers for Scripting Syntax
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
@fastify/reply-from @fastify/reply-from Affected: 0 , < 12.6.2 (semver)
Unaffected: 12.6.2 (semver)
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@fastify/reply-from @fastify/http-proxy Affected: 0 , < 11.4.4 (semver)
Unaffected: 11.4.4 (semver)
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Red Hat Red Hat OpenShift Dev Spaces 3.27     cpe:/a:redhat:openshift_devspaces:3.27::el9
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Credits
FredKSchott mcollina UlisesGascon climba03003
Show details on NVD website
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-33805\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-15T13:08:08.503908Z\"}}}], \"references\": [{\"url\": \"https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-gwhp-pf74-vj37\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-15T13:07:59.414Z\"}}], \"cna\": {\"title\": \"@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers\", \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"FredKSchott\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"mcollina\"}, {\"lang\": \"en\", \"type\": \"remediation reviewer\", \"value\": \"UlisesGascon\"}, {\"lang\": \"en\", \"type\": \"remediation reviewer\", \"value\": \"climba03003\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 9, \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"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\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"@fastify/reply-from\", \"product\": \"@fastify/reply-from\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"12.6.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"12.6.2\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:npm/@fastify/reply-from\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"@fastify/reply-from\", \"product\": \"@fastify/http-proxy\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"11.4.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"11.4.4\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:npm/@fastify/http-proxy\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-gwhp-pf74-vj37\"}, {\"url\": \"https://cna.openjsf.org/security-advisories.html\"}], \"x_generator\": {\"engine\": \"cve-kit 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client\u0027s 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. \\n\\nUpgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client\u0027s 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. \\n\\nUpgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-644\", \"description\": \"CWE-644: Improper Neutralization of HTTP Headers for Scripting Syntax\"}]}], \"providerMetadata\": {\"orgId\": \"ce714d77-add3-4f53-aff5-83d477b104bb\", \"shortName\": \"openjs\", \"dateUpdated\": \"2026-04-15T10:13:25.147Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-33805\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-15T13:08:12.612Z\", \"dateReserved\": \"2026-03-23T19:48:48.714Z\", \"assignerOrgId\": \"ce714d77-add3-4f53-aff5-83d477b104bb\", \"datePublished\": \"2026-04-15T10:13:25.147Z\", \"assignerShortName\": \"openjs\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.