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CVE-2026-85152— undici vulnerable to cross-origin cache poisoning via missing origin isolation in interceptors

Quick assessment

Affected

undici undici

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

undici是undici组织的一个HTTP客户端库。 undici 8.10.0版本至8.10.2之前版本存在输入验证错误漏洞，该漏洞源于缓存和请求去重键中省略目标来源，可能导致跨源信息泄露和持久缓存投毒，进而实现身份验证绕过。

CVSS 7.4 · High EPSS 0.16% · P5 Updated Sep 05, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

Vendor	Product	Version Range	Status
undici	undici	`8.10.0< 8.10.2`	affected
		`8.10.2`	unaffected

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I. Basic Information for CVE-2026-85152

Vulnerability Information

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Vulnerability Title

undici vulnerable to cross-origin cache poisoning via missing origin isolation in interceptors

Source: CVE Program / CVE List V5

Vulnerability Description

undici 8.10.0 omits the destination origin from the cache and request-deduplication keys when the cache or deduplicate interceptor is composed directly onto a Client or Pool. Because the internal cache key falls back to an empty origin string, a cacheable or in-flight response from one upstream origin is returned for a request to a different, trusted origin whenever the method, path, and relevant headers match, which permits cross-origin information disclosure and persistent cache poisoning. The reporter demonstrated a full authentication bypass in which a JWT signed with an attacker-controlled key was accepted as belonging to a trusted issuer, and the trusted origin was never contacted. This is a regression introduced in 8.10.0 and affects undici versions from 8.10.0 up to 8.10.2. Applications using an Agent, which carries the origin in its dispatch options, are not affected. Users should upgrade to undici 8.10.2.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

源验证错误

Source: CVE Program / CVE List V5

Vulnerability Title

undici 输入验证错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
undici	undici	8.10.0 ~ 8.10.2	-

II. Public POCs for CVE-2026-85152

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-85152

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Vendor Advisories for CVE-2026-85152 (1)

🔗 undici vulnerable to cross-origin cache poisoning via missing origin isolation in interceptors · Advisory · nodejs/undici · GitHub

https://www.cve.org/CVERecord?id=CVE-2026-85152

Same Patch Batch · undici · 2026-09-04 · 11 CVEs total

CVE-2026-19534	7.5 HIGH	undici vulnerable to Denial of Service via unrequested WebSocket subprotocol
CVE-2026-84961	7.4 HIGH	undici vulnerable to TLS certificate validation bypass via dropped connect options in Bala
CVE-2026-84933	6.5 MEDIUM	undici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared caches
CVE-2026-85024	5.9 MEDIUM	undici vulnerable to Denial of Service via unhandled error in WebSocket permessage-deflate
CVE-2026-85014	5.9 MEDIUM	undici vulnerable to Denial of Service via WebSocketStream unclean close
CVE-2026-18149	5.9 MEDIUM	undici vulnerable to Denial of Service via orphaned RetryHandler response body
CVE-2026-84890	5.9 MEDIUM	undici vulnerable to Denial of Service via unbounded decompression of compressed responses
CVE-2026-85008	3.7 LOW	undici vulnerable to caching and replay of unsafe HTTP method responses
CVE-2026-84947	3.7 LOW	undici vulnerable to response truncation via oversized chunked responses in the dump inter
CVE-2026-18540	3.7 LOW	undici vulnerable to downstream response splitting via retry interceptor

IV. Related Vulnerabilities

Same product: undici

Same vendor: undici

Same weakness: CWE-346