CVE-2026-16729

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 91% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 5, 2026

Advisory Details (2)

Auto-updated Jul 29, 2026
Patch available. Sources: github.
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html
github Patch Available

undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields · Advisory · nodejs/undici · GitHub

https://github.com/nodejs/undici/security/advisories/GHSA-v3r7-h72x-cjcm

Vendor Advisories for CVE-2026-16729(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnodejs24-main-24.18.1-0.1.hum12026-07-30redhat
redhatnodejs26-main-26.5.1-1.5.hum12026-07-29redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-undici5.15.0+dfsg1+~cs20.10.9.3-1 ... 8.9.0+dfsg+~cs3.2.0-1 (39 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-undici7.15.0+dfsg+~cs3.2.0-1 ... 8.9.0+dfsg+~cs3.2.0-1 (15 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-undici7.15.0+dfsg+~cs3.2.0-1 ... 8.5.0+dfsg+~cs3.2.0-3 (14 versions)8.9.0+dfsg+~cs3.2.0-1—
npm(1)
PackageVulnerable rangeFixed inDependents
undici—8.9.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 19× in last 7d / 71× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 128 total refreshes for this CVE.

  1. 2026-09-19 08:05 UTCEG score recompute
  2. 2026-09-19 08:05 UTCVendor advisory
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 08:16 UTCEG score recompute
  5. 2026-09-18 08:16 UTCVendor advisory
  6. 2026-09-17 08:59 UTCEG score recompute
  7. 2026-09-17 08:59 UTCVendor advisory
  8. 2026-09-16 14:07 UTCEPSS rescore
  9. 2026-09-16 07:08 UTCEG score recompute
  10. 2026-09-16 07:08 UTCVendor advisory
  11. 2026-09-16 05:14 UTCEPSS rescore
  12. 2026-09-15 07:50 UTCEG score recompute
  13. 2026-09-15 07:50 UTCVendor advisory
  14. 2026-09-14 04:21 UTCEG score recompute
  15. 2026-09-14 04:21 UTCVendor advisory
  16. 2026-09-13 16:46 UTCEPSS rescore
  17. 2026-09-13 05:04 UTCEG score recompute
  18. 2026-09-13 05:04 UTCVendor advisory
  19. 2026-09-12 15:00 UTCEPSS rescore
  20. 2026-09-12 05:46 UTCEG score recompute
  21. 2026-09-12 05:46 UTCVendor advisory
  22. 2026-09-11 14:52 UTCEPSS rescore
  23. 2026-09-11 09:36 UTCEPSS rescore
  24. 2026-09-11 06:29 UTCEG score recompute
  25. 2026-09-11 06:29 UTCVendor advisory
Show 75 more
  1. 2026-09-10 09:34 UTCEPSS rescore
  2. 2026-09-10 07:12 UTCVendor advisory
  3. 2026-09-09 07:47 UTCEG score recompute
  4. 2026-09-09 07:47 UTCVendor advisory
  5. 2026-09-08 22:00 UTCEPSS rescore
  6. 2026-09-07 20:46 UTCEG score recompute
  7. 2026-09-07 20:46 UTCVendor advisory
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-06 10:48 UTCEG score recompute
  11. 2026-09-06 10:48 UTCVendor advisory
  12. 2026-09-05 11:30 UTCEG score recompute
  13. 2026-09-05 11:30 UTCVendor advisory
  14. 2026-09-04 11:55 UTCEG score recompute
  15. 2026-09-04 11:55 UTCVendor advisory
  16. 2026-09-04 05:06 UTCEPSS rescore
  17. 2026-09-02 14:11 UTCEPSS rescore
  18. 2026-09-01 23:13 UTCEG score recompute
  19. 2026-09-01 23:13 UTCVendor advisory
  20. 2026-09-01 13:53 UTCEPSS rescore
  21. 2026-09-01 04:39 UTCEPSS rescore
  22. 2026-08-31 23:55 UTCVendor advisory
  23. 2026-08-30 22:34 UTCEG score recompute
  24. 2026-08-30 22:34 UTCVendor advisory
  25. 2026-08-30 19:17 UTCEPSS rescore
  26. 2026-08-30 01:22 UTCEPSS rescore
  27. 2026-08-29 23:17 UTCEG score recompute
  28. 2026-08-29 23:17 UTCVendor advisory
  29. 2026-08-28 21:41 UTCEPSS rescore
  30. 2026-08-27 23:45 UTCVendor advisory
  31. 2026-08-27 00:17 UTCEG score recompute
  32. 2026-08-27 00:17 UTCVendor advisory
  33. 2026-08-26 14:46 UTCEPSS rescore
  34. 2026-08-26 00:59 UTCEG score recompute
  35. 2026-08-26 00:59 UTCVendor advisory
  36. 2026-08-25 13:48 UTCEPSS rescore
  37. 2026-08-25 01:42 UTCEG score recompute
  38. 2026-08-25 01:42 UTCVendor advisory
  39. 2026-08-24 02:25 UTCVendor advisory
  40. 2026-08-23 02:42 UTCVendor advisory
  41. 2026-08-22 03:25 UTCEG score recompute
  42. 2026-08-22 03:25 UTCVendor advisory
  43. 2026-08-21 23:49 UTCEPSS rescore
  44. 2026-08-21 04:07 UTCEG score recompute
  45. 2026-08-21 04:07 UTCVendor advisory
  46. 2026-08-20 22:55 UTCEPSS rescore
  47. 2026-08-20 04:50 UTCEG score recompute
  48. 2026-08-20 04:50 UTCVendor advisory
  49. 2026-08-19 17:03 UTCEPSS rescore
  50. 2026-08-19 05:33 UTCVendor advisory
  51. 2026-08-18 06:15 UTCEG score recompute
  52. 2026-08-18 06:15 UTCVendor advisory
  53. 2026-08-17 13:47 UTCEPSS rescore
  54. 2026-08-17 06:58 UTCEG score recompute
  55. 2026-08-17 06:58 UTCVendor advisory
  56. 2026-08-16 14:56 UTCEPSS rescore
  57. 2026-08-16 07:41 UTCEG score recompute
  58. 2026-08-16 07:41 UTCVendor advisory
  59. 2026-08-16 02:14 UTCEPSS rescore
  60. 2026-08-15 08:24 UTCEG score recompute
  61. 2026-08-15 08:24 UTCVendor advisory
  62. 2026-08-15 01:30 UTCEPSS rescore
  63. 2026-08-14 09:06 UTCVendor advisory
  64. 2026-08-13 09:49 UTCEG score recompute
  65. 2026-08-13 09:49 UTCVendor advisory
  66. 2026-08-12 13:50 UTCEPSS rescore
  67. 2026-08-12 10:32 UTCEG score recompute
  68. 2026-08-12 10:32 UTCVendor advisory
  69. 2026-08-11 13:42 UTCEPSS rescore
  70. 2026-08-11 11:14 UTCEG score recompute
  71. 2026-08-11 11:14 UTCVendor advisory
  72. 2026-08-11 00:00 UTCEPSS rescore
  73. 2026-08-10 11:57 UTCEG score recompute
  74. 2026-08-10 11:57 UTCVendor advisory
  75. 2026-08-09 13:46 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-16729?
CVE-2026-16729 is a medium vulnerability published on July 29, 2026. 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…
When was CVE-2026-16729 disclosed?
CVE-2026-16729 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16729 actively exploited?
CVE-2026-16729 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 91.0% of all scored CVEs.
What is the CVSS score of CVE-2026-16729?
CVE-2026-16729 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-16729?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16729, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-16729

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