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 18× in last 7d / 69× 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 117 total refreshes for this CVE.

  1. 2026-09-15 07:50 UTCEG score recompute
  2. 2026-09-15 07:50 UTCVendor advisory
  3. 2026-09-14 04:21 UTCEG score recompute
  4. 2026-09-14 04:21 UTCVendor advisory
  5. 2026-09-13 16:46 UTCEPSS rescore
  6. 2026-09-13 05:04 UTCEG score recompute
  7. 2026-09-13 05:04 UTCVendor advisory
  8. 2026-09-12 15:00 UTCEPSS rescore
  9. 2026-09-12 05:46 UTCEG score recompute
  10. 2026-09-12 05:46 UTCVendor advisory
  11. 2026-09-11 14:52 UTCEPSS rescore
  12. 2026-09-11 09:36 UTCEPSS rescore
  13. 2026-09-11 06:29 UTCEG score recompute
  14. 2026-09-11 06:29 UTCVendor advisory
  15. 2026-09-10 09:34 UTCEPSS rescore
  16. 2026-09-10 07:12 UTCVendor advisory
  17. 2026-09-09 07:47 UTCEG score recompute
  18. 2026-09-09 07:47 UTCVendor advisory
  19. 2026-09-08 22:00 UTCEPSS rescore
  20. 2026-09-07 20:46 UTCEG score recompute
  21. 2026-09-07 20:46 UTCVendor advisory
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-06 10:48 UTCEG score recompute
  25. 2026-09-06 10:48 UTCVendor advisory
Show 75 more
  1. 2026-09-05 11:30 UTCEG score recompute
  2. 2026-09-05 11:30 UTCVendor advisory
  3. 2026-09-04 11:55 UTCEG score recompute
  4. 2026-09-04 11:55 UTCVendor advisory
  5. 2026-09-04 05:06 UTCEPSS rescore
  6. 2026-09-02 14:11 UTCEPSS rescore
  7. 2026-09-01 23:13 UTCEG score recompute
  8. 2026-09-01 23:13 UTCVendor advisory
  9. 2026-09-01 13:53 UTCEPSS rescore
  10. 2026-09-01 04:39 UTCEPSS rescore
  11. 2026-08-31 23:55 UTCVendor advisory
  12. 2026-08-30 22:34 UTCEG score recompute
  13. 2026-08-30 22:34 UTCVendor advisory
  14. 2026-08-30 19:17 UTCEPSS rescore
  15. 2026-08-30 01:22 UTCEPSS rescore
  16. 2026-08-29 23:17 UTCEG score recompute
  17. 2026-08-29 23:17 UTCVendor advisory
  18. 2026-08-28 21:41 UTCEPSS rescore
  19. 2026-08-27 23:45 UTCVendor advisory
  20. 2026-08-27 00:17 UTCEG score recompute
  21. 2026-08-27 00:17 UTCVendor advisory
  22. 2026-08-26 14:46 UTCEPSS rescore
  23. 2026-08-26 00:59 UTCEG score recompute
  24. 2026-08-26 00:59 UTCVendor advisory
  25. 2026-08-25 13:48 UTCEPSS rescore
  26. 2026-08-25 01:42 UTCEG score recompute
  27. 2026-08-25 01:42 UTCVendor advisory
  28. 2026-08-24 02:25 UTCVendor advisory
  29. 2026-08-23 02:42 UTCVendor advisory
  30. 2026-08-22 03:25 UTCEG score recompute
  31. 2026-08-22 03:25 UTCVendor advisory
  32. 2026-08-21 23:49 UTCEPSS rescore
  33. 2026-08-21 04:07 UTCEG score recompute
  34. 2026-08-21 04:07 UTCVendor advisory
  35. 2026-08-20 22:55 UTCEPSS rescore
  36. 2026-08-20 04:50 UTCEG score recompute
  37. 2026-08-20 04:50 UTCVendor advisory
  38. 2026-08-19 17:03 UTCEPSS rescore
  39. 2026-08-19 05:33 UTCVendor advisory
  40. 2026-08-18 06:15 UTCEG score recompute
  41. 2026-08-18 06:15 UTCVendor advisory
  42. 2026-08-17 13:47 UTCEPSS rescore
  43. 2026-08-17 06:58 UTCEG score recompute
  44. 2026-08-17 06:58 UTCVendor advisory
  45. 2026-08-16 14:56 UTCEPSS rescore
  46. 2026-08-16 07:41 UTCEG score recompute
  47. 2026-08-16 07:41 UTCVendor advisory
  48. 2026-08-16 02:14 UTCEPSS rescore
  49. 2026-08-15 08:24 UTCEG score recompute
  50. 2026-08-15 08:24 UTCVendor advisory
  51. 2026-08-15 01:30 UTCEPSS rescore
  52. 2026-08-14 09:06 UTCVendor advisory
  53. 2026-08-13 09:49 UTCEG score recompute
  54. 2026-08-13 09:49 UTCVendor advisory
  55. 2026-08-12 13:50 UTCEPSS rescore
  56. 2026-08-12 10:32 UTCEG score recompute
  57. 2026-08-12 10:32 UTCVendor advisory
  58. 2026-08-11 13:42 UTCEPSS rescore
  59. 2026-08-11 11:14 UTCEG score recompute
  60. 2026-08-11 11:14 UTCVendor advisory
  61. 2026-08-11 00:00 UTCEPSS rescore
  62. 2026-08-10 11:57 UTCEG score recompute
  63. 2026-08-10 11:57 UTCVendor advisory
  64. 2026-08-09 13:46 UTCEPSS rescore
  65. 2026-08-09 12:40 UTCEG score recompute
  66. 2026-08-09 12:40 UTCVendor advisory
  67. 2026-08-08 16:37 UTCEPSS rescore
  68. 2026-08-08 13:23 UTCEG score recompute
  69. 2026-08-08 13:23 UTCVendor advisory
  70. 2026-08-07 14:05 UTCVendor advisory
  71. 2026-08-06 14:48 UTCEG score recompute
  72. 2026-08-06 14:48 UTCVendor advisory
  73. 2026-08-06 13:46 UTCEPSS rescore
  74. 2026-08-05 19:17 UTCEPSS rescore
  75. 2026-08-05 15:31 UTCEG score recompute▲ 1.70

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 91.1% 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

Explore →

Is Your Infrastructure Affected by CVE-2026-16729?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs