CVE-2026-94439

HIGHPre-NVD 7.57.5
EchelonGraph scoreHIGH confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-10-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week

Also known asEUVD-2026-95428 (ENISA EUVD) · GHSA-2gfw-j3c5-j46w (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
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).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns without hijacking the connection, the server improperly continues to read and serve requests from the connection. Since a 2xx response to an HTTP/1 CONNECT converts the connection into a tunnel, the server should not treat the connection as continuing to contain HTTP. The impact of this misbehavior is mostly limited to potential request smuggling, where an intermediate proxy considers the data on the connection to be tunneled and the server considers it to be HTTP.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
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 none (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
0.4%
EPSS %ILE
35th
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). 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 none (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

October 8, 2026

Last Modified

October 9, 2026

Advisory Details (4)

Auto-updated Oct 9, 2026
Patch available.
Web page

GO-2026-6613 - Go Packages

https://pkg.go.dev/vuln/GO-2026-6613
Web page

net/http: HTTP/1 server connection desynchronization after 2xx CONNECT response · Issue #81744 · golang/go · GitHub

https://go.dev/issue/81744

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntugolang-1.22-src (1.22.2-2~22.04.4) @ jammy2026-10-27ubuntu
redhatgo-toolset:rhel8-8080020261020152326.6b4b45d82026-10-21redhat
redhatgolang-0:1.26.10-1.el9_22026-10-21redhat
redhatgolang-0:1.26.10-1.el9_62026-10-21redhat
redhatgo-toolset:rhel8-8060020261020153812.97d7f71f2026-10-21redhat
redhatgolang-0:1.26.10-1.el9_42026-10-21redhat
redhatgolang-0:1.26.10-1.el10_02026-10-21redhat
redhatgo-toolset:rhel8-8100020261020054335.a3795dee2026-10-20redhat
redhatgolang-0:1.26.10-1.el9_82026-10-20redhat
redhatgolang-0:1.26.10-1.el10_22026-10-20redhat

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

(6 across 4 ecosystems)
Debian:14(3)
PackageVulnerable rangeFix by version rangeDependents
golang-1.251.25.0-1 ... 1.25.9-1 (20 versions)
  • every version on: no fix on record
—
golang-1.261.26.0-1 ... 1.26~rc3-2 (24 versions)
  • every version on: no fix on record
—
golang-1.271.27.0-1 ... 1.27~rc3-1 (9 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
golang-1.191.19.10-1 ... 1.19.9-1 (12 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
golang-1.241.24.12-1 ... 1.24.9-1 (10 versions)
  • every version on: no fix on record
—
Go(1)
PackageVulnerable rangeFix by version rangeDependents
stdlib—
  • every version up to 1.26.9: fixed in 1.26.9
  • 1.27.0-0 up to 1.27.2: fixed in 1.27.2
—

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 10× in last 7d / 51× 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.

  1. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-27 19:16 UTCEG score recompute
  7. 2026-10-27 19:16 UTCVendor advisory
  8. 2026-10-27 19:16 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-10-25 13:49 UTCEG score recompute
  13. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  17. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-10-20 06:50 UTCEG score recompute
  19. 2026-10-20 06:50 UTCVendor advisory
  20. 2026-10-20 06:50 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  22. 2026-10-18 02:58 UTCEG score recompute
  23. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  24. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  25. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
Show 26 more
  1. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  3. 2026-10-13 04:18 UTCEG score recompute
  4. 2026-10-13 04:18 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w · GitHub severity HIGH · GitHub CVSS 7.5
  5. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  6. 2026-10-12 14:42 UTCEG score recompute
  7. 2026-10-11 19:12 UTCEG score recompute
  8. 2026-10-11 17:54 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-10-11 16:27 UTCEG score recompute
  10. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  11. 2026-10-11 13:40 UTCEG score recompute
  12. 2026-10-11 05:36 UTCEG score recompute
  13. 2026-10-11 05:36 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  15. 2026-10-10 17:36 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-10-10 05:36 UTCEG score recompute
  17. 2026-10-10 05:36 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-10-09 17:35 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w
  20. 2026-10-09 17:06 UTCEG score recomputeFirst assessed: 7.5 HIGH
  21. 2026-10-09 17:06 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w
  22. 2026-10-09 17:03 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  23. 2026-10-09 16:58 UTCGHSA enrichmentGHSA-2gfw-j3c5-j46w
  24. 2026-10-08 23:20 UTCNVD update
  25. 2026-10-08 22:58 UTCEG score recompute
  26. 2026-10-08 22:58 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-94439?
CVE-2026-94439 is a high-severity vulnerability; its CVE record was published on October 8, 2026. When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns without hijacking the connection, the server improperly continues to read and serve requests from the connection. Since a 2xx response to an HTTP/1 CONNECT converts the connection into a tunnel, the server…
When was the CVE record for CVE-2026-94439 published?
The CVE record for CVE-2026-94439 was published on October 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 9, 2026; the record at its source may have been updated since.
Is CVE-2026-94439 actively exploited?
CVE-2026-94439 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-94439?
CVE-2026-94439 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-94439?
A fix for CVE-2026-94439 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-94439 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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