CVE-2026-43972 (GCVE-0-2026-43972)
Vulnerability from cvelistv5 – Published: 2026-06-08 14:12 – Updated: 2026-06-08 16:34
VLAI
EPSS
VEX
Title
gun HTTP/2 PUSH_PROMISE authority not validated against connection origin allows cross-origin cookie injection
Summary
Origin Validation Error vulnerability in ninenines gun (gun_http2 module) allows cross-origin cookie injection via unvalidated HTTP/2 PUSH_PROMISE authority.
In gun_http2:push_promise_frame/7, the :authority pseudo-header from an incoming PUSH_PROMISE frame is stored verbatim into the promised stream record without checking that it matches the connection's origin. When gun_http2:headers_frame/9 later processes the response headers for the promised stream, it calls gun_cookies:set_cookie_header/7 with the unvalidated server-supplied authority before any status branching and before user code can act. This violates RFC 7540 §10.6 / RFC 9113 §8.4, which require receivers to treat as a protocol error any push for a resource the server is not authoritative for.
A malicious or compromised HTTP/2 server can plant cookies scoped to arbitrary third-party domains into the client's shared cookie store. This enables session fixation attacks against those domains and, if the planted cookie overrides a legitimate session token, may result in account takeover. No user interaction beyond making a normal HTTP/2 request to the attacker-controlled server is required.
This issue affects gun: from 2.0.0 before 2.4.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-346 - Origin Validation Error
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cna.erlef.org/cves/CVE-2026-43972.html | relatedthird-party-advisory |
| https://osv.dev/vulnerability/EEF-CVE-2026-43972 | related |
| https://github.com/ninenines/gun/commit/567863ff5… | patch |
Impacted products
Credits
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When gun_http2:headers_frame/9 later processes the response headers for the promised stream, it calls gun_cookies:set_cookie_header/7 with the unvalidated server-supplied authority before any status branching and before user code can act. This violates RFC 7540 \\u00a710.6 / RFC 9113 \\u00a78.4, which require receivers to treat as a protocol error any push for a resource the server is not authoritative for.\\n\\nA malicious or compromised HTTP/2 server can plant cookies scoped to arbitrary third-party domains into the client\u0027s shared cookie store. This enables session fixation attacks against those domains and, if the planted cookie overrides a legitimate session token, may result in account takeover. No user interaction beyond making a normal HTTP/2 request to the attacker-controlled server is required.\\n\\nThis issue affects gun: from 2.0.0 before 2.4.0.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Origin Validation Error vulnerability in ninenines gun (\u003ctt\u003egun_http2\u003c/tt\u003e module) allows cross-origin cookie injection via unvalidated HTTP/2 PUSH_PROMISE authority.\u003cp\u003eIn \u003ctt\u003egun_http2:push_promise_frame/7\u003c/tt\u003e, the \u003ctt\u003e:authority\u003c/tt\u003e pseudo-header from an incoming PUSH_PROMISE frame is stored verbatim into the promised stream record without checking that it matches the connection\u0027s origin. When \u003ctt\u003egun_http2:headers_frame/9\u003c/tt\u003e later processes the response headers for the promised stream, it calls \u003ctt\u003egun_cookies:set_cookie_header/7\u003c/tt\u003e with the unvalidated server-supplied authority before any status branching and before user code can act. This violates RFC 7540 \\u00a710.6 / RFC 9113 \\u00a78.4, which require receivers to treat as a protocol error any push for a resource the server is not authoritative for.\u003c/p\u003e\u003cp\u003eA malicious or compromised HTTP/2 server can plant cookies scoped to arbitrary third-party domains into the client\u0027s shared cookie store. This enables session fixation attacks against those domains and, if the planted cookie overrides a legitimate session token, may result in account takeover. No user interaction beyond making a normal HTTP/2 request to the attacker-controlled server is required.\u003c/p\u003e\u003cp\u003eThis issue affects gun: from 2.0.0 before 2.4.0.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-346\", \"description\": \"CWE-346 Origin Validation Error\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The vulnerability is exploitable only when gun is configured with a cookie_store and connects to an HTTP/2 server with server push enabled.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe vulnerability is exploitable only when gun is configured with a \u003ctt\u003ecookie_store\u003c/tt\u003e and connects to an HTTP/2 server with server push enabled.\u003c/p\u003e\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.4.0\", \"versionStartIncluding\": \"2.0.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-06-08T16:34:45.350Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-43972\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-08T16:34:45.350Z\", \"dateReserved\": \"2026-05-04T18:23:25.574Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-06-08T14:12:38.780Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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