CVE-2026-97687

HIGHPre-NVD 7.67.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (13th percentile of EPSS-scored CVEs). 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, secondary
Trending — 4 sources updated this week
7.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

urllib3 is an HTTP client library for Python. From 1.26.0 until 2.8.0, the proxy_ssl_context, proxy_assert_hostname, proxy_assert_fingerprint, ssl_context, cert_reqs, verify_mode, use_forwarding_for_https=True, and CERT_NONE configuration paths fail to remain separated because target-server TLS settings are incorrectly applied to the HTTPS proxy connection. The trigger is that an application uses an HTTPS proxy and configures target-server TLS settings that must remain separate from the proxy TLS handshake, including HTTPS forwarding with target-specific identity or credentials. Applying cert_reqs=CERT_NONE can overwrite proxy_ssl_context.verify_mode in place, and the mutation persists so later connections reusing the same context may connect to the HTTPS proxy without certificate verification. The attack mechanism is that an attacker intercepts and impersonates the HTTPS proxy after the effective proxy policy accepts the attacker's certificate. The impact is that the attacker can observe or modify forwarded traffic or receive a target TLS client certificate, while CONNECT tunneling still preserves the separate end-to-end target TLS connection. This issue is fixed in version 2.8.0.

CVSS v3
7.6
EG Score
7.6HIGHmedium confidence
EG Risk
34
EG Risk 34/100CISA SSVC

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
Severity76% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 29, 2026
Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

2.8.0

Patch available: urllib3/urllib3 2.8.0

https://github.com/urllib3/urllib3/releases/tag/2.8.0
github_commit Patch Available

commit b6447295fff7 (urllib3/urllib3)

Patch available: urllib3/urllib3 2.8.0 (contains commit b6447295fff7)

https://github.com/urllib3/urllib3/commit/b6447295fff7b38fdffc67e0df9712d60cef3cc3
github_commit Patch Available

commit 07408cec79d1 (urllib3/urllib3)

Patch available: urllib3/urllib3 2.8.0 (contains commit 07408cec79d1)

https://github.com/urllib3/urllib3/commit/07408cec79d1856d81bb42c74a904a24fdb9e465
github_pr Patch Available

HTTPSConnection: Prefer proxy verify policy for the proxy connection

Patch available: urllib3/urllib3 2.8.0 (PR #5093 merged 2026-07-29)

https://github.com/urllib3/urllib3/pull/5093
github Patch Available

HTTPS proxy TLS configuration may be ignored or overridden · Advisory · urllib3/urllib3 · GitHub

https://github.com/urllib3/urllib3/security/advisories/GHSA-8988-9cw3-xx77

Vendor Advisories for CVE-2026-97687(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatpython-urllib3-main-2.8.0-1.hum12026-09-21redhat

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

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
urllib31.26.0 ... 2.7.0 (46 versions)2.8.0—

Weakness Classification(2)

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 24× in last 7d / 24× 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.

  1. 2026-10-04 04:43 UTCVendor advisory
  2. 2026-10-03 17:24 UTCEG score recompute
  3. 2026-10-03 17:24 UTCVendor advisory
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-03 06:06 UTCVendor advisory
  6. 2026-10-02 18:47 UTCEG score recompute
  7. 2026-10-02 18:47 UTCVendor advisory
  8. 2026-10-02 17:57 UTCEPSS rescore
  9. 2026-10-02 07:27 UTCVendor advisory
  10. 2026-10-01 20:08 UTCEG score recompute
  11. 2026-10-01 20:08 UTCVendor advisory
  12. 2026-10-01 19:51 UTCEPSS rescore
  13. 2026-10-01 08:48 UTCVendor advisory
  14. 2026-09-30 21:29 UTCEG score recompute
  15. 2026-09-30 21:29 UTCVendor advisory
  16. 2026-09-30 20:27 UTCEG score recompute
  17. 2026-09-30 20:27 UTCVendor advisory
  18. 2026-09-30 19:45 UTCVendor advisory
  19. 2026-09-30 15:11 UTCEG score recompute
  20. 2026-09-30 15:11 UTCVendor advisory
  21. 2026-09-30 15:04 UTCEPSS rescore
  22. 2026-09-29 16:34 UTCEG score recompute
  23. 2026-09-29 15:38 UTCEG score recompute
  24. 2026-09-29 15:38 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same vendor + same CWE)

Same vendor

2 shown

redhat:RHSA-2026:69612

Frequently asked(5)

What is CVE-2026-97687?
CVE-2026-97687 is a high vulnerability published on September 29, 2026. urllib3 is an HTTP client library for Python. From 1.26.0 until 2.8.0, the proxysslcontext, proxyasserthostname, proxyassertfingerprint, sslcontext, certreqs, verifymode, useforwardingforhttps=True, and CERTNONE configuration paths fail to remain separated because target-server TLS settings are…
When was CVE-2026-97687 disclosed?
CVE-2026-97687 was first published on September 29, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-97687 actively exploited?
CVE-2026-97687 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-97687?
CVE-2026-97687 has a CVSS base score of 7.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-97687?
A fix for CVE-2026-97687 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-97687 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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