undici vulnerable to downstream response splitting via retry interceptor

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-18540 · CVE overview and exploitation status

EUVD-2026-71661

GHSA-r53p-7pc4-xj5r

cve-program · CVE-2026-18540

• https://github.com/nodejs/undici/security/advisories/GHSA-r53p-7pc4-xj5r
• https://cna.openjsf.org/security-advisories.html

euvd · EUVD-2026-71661

• https://github.com/nodejs/undici/security/advisories/GHSA-r53p-7pc4-xj5r
• https://cna.openjsf.org/security-advisories.html

nvd · CVE-2026-18540

• https://cna.openjsf.org/security-advisories.html
• https://github.com/nodejs/undici/security/advisories/GHSA-r53p-7pc4-xj5r

osv · GHSA-r53p-7pc4-xj5r

• https://github.com/nodejs/undici/security/advisories/GHSA-r53p-7pc4-xj5r
• https://nvd.nist.gov/vuln/detail/CVE-2026-18540
• https://github.com/nodejs/undici/commit/0160a719063fb0a77f4fdf9500b9166b91e14329
• https://github.com/nodejs/undici/commit/cd8af90b38ae33c2838d54a2d629774122effe95
• https://github.com/nodejs/undici/commit/ce31bc824b578008faae5d3350da66c1b5f71548
• https://hackerone.com/reports/3900104
• https://hackerone.com/reports/3900615
• https://cna.openjsf.org/security-advisories.html
• https://github.com/nodejs/undici
• https://github.com/nodejs/undici/releases/tag/v6.28.1
• https://github.com/nodejs/undici/releases/tag/v7.29.1
• https://github.com/nodejs/undici/releases/tag/v8.10.2

• 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 de… · Advisory content revised · 5 Nov 2026