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Fri, 04 Sep 2026 18:30:00 +0000
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ssvc
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Fri, 04 Sep 2026 17:30:00 +0000
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| Description | undici's retry interceptor can append the body of a ranged retry response to bytes already delivered from an earlier partial response while still presenting the original response's status and headers. This happens when an upstream server delivers part of a body without a trustworthy resume checkpoint, for example a non-success response whose headers were already sent or a partial-content response with an unusable content range, then closes the connection and answers the resumed range request with more bytes. As a result the response body can be longer than the Content-Length that the application observes. An application that relays such a response to a downstream HTTP/1.1 peer without normalizing the framing can emit a body that exceeds the forwarded Content-Length, and the excess bytes can be interpreted as the start of a following response, which enables downstream response splitting or desynchronization. Exploitation requires an attacker-controlled upstream server and an application that forwards the response through a framing-sensitive path. This affects undici versions before 6.28.1, from 7.0.0 up to 7.29.1, and from 8.0.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2. | |
| Title | undici vulnerable to downstream response splitting via retry interceptor | |
| Weaknesses | CWE-444 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-09-04T17:50:13.682Z
Reserved: 2026-07-31T20:47:28.965Z
Link: CVE-2026-18540
Updated: 2026-09-04T17:50:09.864Z
Status : Received
Published: 2026-09-04T18:17:50.020
Modified: 2026-09-04T18:17:50.020
Link: CVE-2026-18540
No data.
OpenCVE Enrichment
Updated: 2026-09-04T19:45:03Z