CVE-2026-72816

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 6.5 from GitHub Security Advisory published 2026-08-14. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated

Also known asEUVD-2026-58631 (ENISA EUVD) · GHSA-xg24-pmhh-m4m9 (GitHub Security Advisories) · GO-2026-5777 (OSV.dev)Source: ENISA EUVD

6.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

go-chi/chi through 5.2.1 contains an IP spoofing vulnerability in the RealIP middleware (middleware/realip.go). The realIP() function reads client-controlled headers (True-Client-IP, X-Real-IP, and X-Forwarded-For) and overwrites r.RemoteAddr without verifying that the request originated from a trusted proxy. Attackers can supply arbitrary IP addresses in these headers to bypass IP-based access controls, evade rate limiting and geo-IP restrictions, and pollute audit logs. Fixed in 5.3.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
60
EG Risk 60/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 14, 2026

Last Modified

October 8, 2026

Advisory Details (2)

Auto-updated Aug 14, 2026
Patch available. Sources: github.
Web page

go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware | Advisories | VulnCheck

https://www.vulncheck.com/advisories/go-chi-chi-before-ip-spoofing-via-realip-middleware
GitHub advisoryMentions a patch (unverified)

RealIP Middleware allows IP spoofing via unvalidated X-Forwarded-For header · Advisory · go-chi/chi · GitHub

https://github.com/go-chi/chi/security/advisories/GHSA-rjr7-jggh-pgcp

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatcosign-main-3.1.3-0.1.hum12026-08-12redhat
redhatspire1-14-main-1.14.7-0.4.hum12026-08-03redhat
redhatspire1-15-main-1.15.2-0.4.hum12026-08-03redhat

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

(9 across 4 ecosystems)
Go(6)
PackageVulnerable rangeFix by version rangeDependents
github.com/go-chi/chi/middleware—
  • every version through 1.5.5: no fix on record
—
github.com/go-chi/chi/v2/middleware—
  • every version through 2.1.1: no fix on record
—
github.com/go-chi/chi/v3/middleware—
  • every version through 3.3.5: no fix on record
—
github.com/go-chi/chi/v4/middleware—
  • every version through 4.1.3: no fix on record
—
github.com/go-chi/chi/v5—
  • every version up to 5.3.0: fixed in 5.3.0
—
github.com/go-chi/chi/v5/middleware—
  • every version up to 5.3.0: fixed in 5.3.0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-go-chi-chi5.0.7-1 ... 5.3.0-1 (6 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-go-chi-chi5.2.0-1, 5.2.3-1, 5.2.5-1, 5.3.0-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-go-chi-chi5.2.0-1, 5.2.3-1, 5.2.5-1
  • every version up to 5.3.0-1: fixed in 5.3.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 54× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 216 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 116 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  4. 2026-10-30 06:55 UTCOSV refresh
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  6. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  7. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  8. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  9. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  10. 2026-10-25 14:06 UTCEG score recompute
  11. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  12. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-10-22 19:21 UTCEG score recompute
  14. 2026-10-22 19:21 UTCVendor advisory
  15. 2026-10-22 19:21 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  16. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  19. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  21. 2026-10-18 03:15 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
Show 75 more
  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-10-12 15:41 UTCEG score recompute
  4. 2026-10-11 19:27 UTCEG score recompute
  5. 2026-10-11 16:42 UTCEG score recompute
  6. 2026-10-11 14:02 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  11. 2026-10-08 16:37 UTCEG score recompute
  12. 2026-10-08 16:37 UTCVendor advisory
  13. 2026-10-08 16:37 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  14. 2026-10-08 15:43 UTCEG score recompute
  15. 2026-10-08 15:43 UTCVendor advisory
  16. 2026-10-08 15:43 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  19. 2026-10-06 09:24 UTCEG score recompute
  20. 2026-10-06 09:24 UTCVendor advisory
  21. 2026-10-06 09:24 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  22. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  23. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  24. 2026-10-04 22:13 UTCVendor advisory
  25. 2026-10-04 22:13 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  26. 2026-10-03 19:42 UTCEG score recompute
  27. 2026-10-03 19:42 UTCVendor advisory
  28. 2026-10-03 19:42 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  29. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  30. 2026-10-02 07:22 UTCEG score recompute
  31. 2026-10-02 07:22 UTCVendor advisory
  32. 2026-10-02 07:22 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  33. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  34. 2026-09-30 21:42 UTCEG score recompute
  35. 2026-09-30 21:42 UTCVendor advisory
  36. 2026-09-30 21:42 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  37. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  38. 2026-09-28 10:58 UTCEG score recompute
  39. 2026-09-28 10:58 UTCVendor advisory
  40. 2026-09-28 10:58 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  41. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  42. 2026-09-27 09:39 UTCEG score recompute
  43. 2026-09-27 09:39 UTCVendor advisory
  44. 2026-09-27 09:39 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  45. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  46. 2026-09-25 03:24 UTCEG score recompute
  47. 2026-09-25 03:24 UTCVendor advisory
  48. 2026-09-25 03:24 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  49. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  50. 2026-09-23 16:42 UTCEG score recompute
  51. 2026-09-23 16:42 UTCVendor advisory
  52. 2026-09-23 16:41 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  53. 2026-09-22 15:23 UTCEG score recompute
  54. 2026-09-22 15:23 UTCVendor advisory
  55. 2026-09-22 15:23 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  56. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  57. 2026-09-21 14:03 UTCEG score recompute
  58. 2026-09-21 14:03 UTCVendor advisory
  59. 2026-09-21 14:03 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  60. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  61. 2026-09-20 12:43 UTCEG score recompute
  62. 2026-09-20 12:43 UTCVendor advisory
  63. 2026-09-20 12:43 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  64. 2026-09-19 11:11 UTCEG score recompute
  65. 2026-09-19 11:11 UTCVendor advisory
  66. 2026-09-19 11:11 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  67. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  68. 2026-09-18 08:15 UTCEG score recompute
  69. 2026-09-18 08:15 UTCVendor advisory
  70. 2026-09-18 08:15 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  71. 2026-09-17 06:56 UTCEG score recompute
  72. 2026-09-17 06:56 UTCVendor advisory
  73. 2026-09-17 06:56 UTCGHSA enrichmentGHSA-xg24-pmhh-m4m9 · GitHub CVSS 6.5
  74. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  75. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile

Frequently asked(5)

What is CVE-2026-72816?
CVE-2026-72816 is a medium-severity vulnerability; its CVE record was published on August 14, 2026. go-chi/chi through 5.2.1 contains an IP spoofing vulnerability in the RealIP middleware (middleware/realip.go). The realIP() function reads client-controlled headers (True-Client-IP, X-Real-IP, and X-Forwarded-For) and overwrites r.RemoteAddr without verifying that the request originated from a…
When was CVE-2026-72816 made public?
CVE-2026-72816 was made public on May 22, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 14, 2026. EchelonGraph's copy of the record carries a last-modified date of October 8, 2026; the record at its source may have been updated since.
Is CVE-2026-72816 actively exploited?
CVE-2026-72816 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-72816?
CVE-2026-72816 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-72816?
A fix for CVE-2026-72816 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-72816 are linked in the Vendor Advisories panel on this page.

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