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CVE-2026-16729

undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields

CVSS 3.1 4.8 MEDIUMEUVD CVSS 3.1 4.8 CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary 4.8 MEDIUMCVSS 3.1 · [email protected] · Primary 6.5 MEDIUMCVSS_V3 Publisher rating MODERATEFixed by undici 6.28.0Fixed by undici 7.29.0Fixed by undici 8.9.0KEV status unknown
Original advisory

cve-program · CVE-2026-16729

Published

undici's setCookie function does not fully sanitize cookie attributes. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a domain value is not checked for semicolons and entries in the unparsed array are not sanitized, so attacker-influenced input can inject additional cookie attributes. For example, a domain value containing a semicolon can append attributes such as SameSite, and an unparsed entry can inject attributes such as HttpOnly, without the caller setting them. Applications that pass user-controlled input to these fields, such as multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, or the Secure, HttpOnly, and SameSite attributes forced, stripped, or overridden. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.

Read the publisher's advisory

euvd · EUVD-2026-50416

Published

undici's setCookie function does not fully sanitize cookie attributes. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a domain value is not checked for semicolons and entries in the unparsed array are not sanitized, so attacker-influenced input can inject additional cookie attributes. For example, a domain value containing a semicolon can append attributes such as SameSite, and an unparsed entry can inject attributes such as HttpOnly, without the caller setting them. Applications that pass user-controlled input to these fields, such as multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, or the Secure, HttpOnly, and SameSite attributes forced, stripped, or overridden. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.

Read the publisher's advisory

nvd · CVE-2026-16729

Published

undici's setCookie function does not fully sanitize cookie attributes. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a domain value is not checked for semicolons and entries in the unparsed array are not sanitized, so attacker-influenced input can inject additional cookie attributes. For example, a domain value containing a semicolon can append attributes such as SameSite, and an unparsed entry can inject attributes such as HttpOnly, without the caller setting them. Applications that pass user-controlled input to these fields, such as multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, or the Secure, HttpOnly, and SameSite attributes forced, stripped, or overridden. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.

Read the publisher's advisory

osv · GHSA-v3r7-h72x-cjcm

Published

## Impact The `setCookie` function has two attribute injection paths. `validateCookieDomain` does not reject semicolons (`validateCookiePath` already does at 0x3B), so a `domain` value like `example.com; SameSite=None` lands verbatim as `Domain=example.com; SameSite=None`. The `unparsed` array's loop only checks each entry contains `=` and does not sanitize values, so an entry like `X-Custom=val; HttpOnly` lands unchanged, injecting `HttpOnly` without the caller setting `cookie.httpOnly = true`. Applications that pass user-controlled input to these fields, typically multi-tenant or reverse-proxy servers that scope session cookies to a tenant-supplied domain, can have SameSite CSRF protections bypassed, `Secure` or `HttpOnly` forced or stripped, or the intended SameSite tier overridden. ## Patches Patched in undici v6.28.0, v7.29.0, and v8.9.0. ## Workarounds - Sanitize `domain` values against the RFC 1034 letter-digit-hyphen set before passing to `setCookie`. - Do not pass user-controlled data to the `unparsed` field.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-16729

Published

undici

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "undici",
                    "product": "undici",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "0",
                            "lessThan": "6.28.0"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "6.28.0"
                        },
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "7.0.0",
                            "lessThan": "7.29.0"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "7.29.0"
                        },
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "8.0.0",
                            "lessThan": "8.9.0"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "8.9.0"
                        }
                    ],
                    "packageURL": "pkg:npm/undici"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-50416

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jul 29, 2026, 4:45:57 PM

dateUpdated: Jul 29, 2026, 6:08:16 PM

8 related source bulletins · separate from aliases

RHSA-2026:48537: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

CVE-2026-13697 · CVE-2026-14643 · CVE-2026-15157 · CVE-2026-16728 · CVE-2026-16729 · CVE-2026-56846 · CVE-2026-56847 · CVE-2026-56850 · CVE-2026-58039 · CVE-2026-58040 · CVE-2026-58041 · CVE-2026-58042 · CVE-2026-58043 · CVE-2026-58044 · CVE-2026-58045

RHSA-2026:48273: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

CVE-2026-13697 · CVE-2026-14643 · CVE-2026-15157 · CVE-2026-16728 · CVE-2026-16729 · CVE-2026-56847 · CVE-2026-56850 · CVE-2026-58039 · CVE-2026-58040 · CVE-2026-58043

WID-SEC-W-2026-3596: IBM App Connect Enterprise: Mehrere Schwachstellen

CVE-2022-35948 · CVE-2026-13149 · CVE-2026-14257 · CVE-2026-15157 · CVE-2026-1527 · CVE-2026-16728 · CVE-2026-16729 · CVE-2026-18149 · CVE-2026-18540 · CVE-2026-19534 · CVE-2026-2391 · CVE-2026-45820 · CVE-2026-54272 · CVE-2026-63670 · CVE-2026-67213 · CVE-2026-67214 · CVE-2026-69152 · CVE-2026-69192 · CVE-2026-69198 · CVE-2026-73566 · CVE-2026-73646 · CVE-2026-77037 · CVE-2026-77063 · CVE-2026-77078 · CVE-2026-82333 · CVE-2026-82417 · CVE-2026-82562 · CVE-2026-83605 · CVE-2026-83606 · CVE-2026-83607 · CVE-2026-83608 · CVE-2026-83609 · CVE-2026-83610 · CVE-2026-83611 · CVE-2026-83612 · CVE-2026-83613 · CVE-2026-83614 · CVE-2026-83615 · CVE-2026-83616 · CVE-2026-83618 · CVE-2026-83619 · CVE-2026-84292 · CVE-2026-84371 · CVE-2026-84375 · CVE-2026-84890 · CVE-2026-84933 · CVE-2026-84947 · CVE-2026-84961 · CVE-2026-85008 · CVE-2026-85014 · CVE-2026-85024 · CVE-2026-85152

WID-SEC-W-2026-3621: IBM App Connect Enterprise: Mehrere Schwachstellen

CVE-2022-35948 · CVE-2026-13697 · CVE-2026-14643 · CVE-2026-15157 · CVE-2026-1527 · CVE-2026-16728 · CVE-2026-16729 · CVE-2026-59871 · CVE-2026-59873 · CVE-2026-59874 · CVE-2026-59875 · CVE-2026-92595 · CVE-2026-92596 · CVE-2026-92597 · CVE-2026-92598 · CVE-2026-9678

SUSE-SU-2026:4248-1: Security update for nodejs18

CVE-2025-22150 · CVE-2025-23166 · CVE-2025-23167 · CVE-2025-55131 · CVE-2025-59465 · CVE-2025-59466 · CVE-2025-62408 · CVE-2026-11525 · CVE-2026-12151 · CVE-2026-15157 · CVE-2026-16728 · CVE-2026-16729 · CVE-2026-21637 · CVE-2026-21710 · CVE-2026-21713 · CVE-2026-21714 · CVE-2026-21717 · CVE-2026-22036 · CVE-2026-27135 · CVE-2026-48618 · CVE-2026-48619 · CVE-2026-48928 · CVE-2026-48930 · CVE-2026-48931 · CVE-2026-48933 · CVE-2026-48934 · CVE-2026-48935 · CVE-2026-48937 · CVE-2026-56846 · CVE-2026-56848 · CVE-2026-56850 · CVE-2026-58040 · CVE-2026-58042 · CVE-2026-58043 · CVE-2026-58044 · CVE-2026-58045 · CVE-2026-6733 · CVE-2026-9679

SUSE-SU-2026:3929-1: Security update for nodejs20

CVE-2025-22150 · CVE-2026-11525 · CVE-2026-12151 · CVE-2026-16728 · CVE-2026-16729 · CVE-2026-22036 · CVE-2026-27135 · CVE-2026-40170 · CVE-2026-42338 · CVE-2026-48615 · CVE-2026-48617 · CVE-2026-48618 · CVE-2026-48619 · CVE-2026-48928 · CVE-2026-48930 · CVE-2026-48931 · CVE-2026-48933 · CVE-2026-48934 · CVE-2026-48935 · CVE-2026-48937 · CVE-2026-54272 · CVE-2026-56846 · CVE-2026-56847 · CVE-2026-56848 · CVE-2026-56850 · CVE-2026-58039 · CVE-2026-58040 · CVE-2026-58042 · CVE-2026-58043 · CVE-2026-58044 · CVE-2026-58045 · CVE-2026-6733 · CVE-2026-69192 · CVE-2026-9496 · CVE-2026-9679

msrc_CVE-2026-16729: undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields

CVE-2026-16729

SUSE-SU-2026:3930-1: Security update for nodejs20

CVE-2025-22150 · CVE-2026-11525 · CVE-2026-12151 · CVE-2026-16728 · CVE-2026-16729 · CVE-2026-22036 · CVE-2026-27135 · CVE-2026-40170 · CVE-2026-42338 · CVE-2026-48615 · CVE-2026-48617 · CVE-2026-48618 · CVE-2026-48619 · CVE-2026-48928 · CVE-2026-48930 · CVE-2026-48931 · CVE-2026-48933 · CVE-2026-48934 · CVE-2026-48935 · CVE-2026-48937 · CVE-2026-54272 · CVE-2026-56846 · CVE-2026-56847 · CVE-2026-56848 · CVE-2026-56850 · CVE-2026-58039 · CVE-2026-58040 · CVE-2026-58042 · CVE-2026-58043 · CVE-2026-58044 · CVE-2026-58045 · CVE-2026-6733 · CVE-2026-69192 · CVE-2026-9496 · CVE-2026-9679

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-16729

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-74

Original publisher date fields

published: 2026-07-29T17:16:51.123

lastModified: 2026-08-05T15:18:55.053

1 source CPE criteria · context only
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-v3r7-h72x-cjcm

Published

undici

npm

SEMVER · introduced 0 → fixed 6.28.0

undici

npm

SEMVER · introduced 7.0.0 → fixed 7.29.0

undici

npm

SEMVER · introduced 8.0.0 → fixed 8.9.0

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 18:02 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current

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