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.
CVE-2026-97687
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.2% (10th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-89000 (ENISA EUVD) · GHSA-8988-9cw3-xx77 (GitHub Security Advisories) · PYSEC-2026-4175 (OSV.dev)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 8.1
- EG Score
- 8.1HIGHmedium confidence
- EG Risk
- 37EG Risk 37/100
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)Severity81% × 45%Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.2% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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. - EPSS PROB
- 0.2%
- EPSS %ILE
- 10th
- 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 (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.
- EG Severity
- 8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-10). 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; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade 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; 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). 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; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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
September 29, 2026
Last Modified
October 13, 2026
Advisory Details (5)
Auto-updated Sep 29, 20262.8.0
Patch available: urllib3/urllib3 2.8.0
https://github.com/urllib3/urllib3/releases/tag/2.8.0commit b6447295fff7 (urllib3/urllib3)
Patch available: urllib3/urllib3 2.8.0 (contains commit b6447295fff7)
https://github.com/urllib3/urllib3/commit/b6447295fff7b38fdffc67e0df9712d60cef3cc3commit 07408cec79d1 (urllib3/urllib3)
Patch available: urllib3/urllib3 2.8.0 (contains commit 07408cec79d1)
https://github.com/urllib3/urllib3/commit/07408cec79d1856d81bb42c74a904a24fdb9e465HTTPSConnection: 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/5093HTTPS proxy TLS configuration may be ignored or overridden · Advisory · urllib3/urllib3 · GitHub
https://github.com/urllib3/urllib3/security/advisories/GHSA-8988-9cw3-xx77Vendor Advisories for CVE-2026-97687(20)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:99027Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Quay - 3.12.24
- RHSA-2026:99026Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Quay - 3.17.7
- RHSA-2026:99025Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Quay - 3.10.28
- RHSA-2026:99024Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Quay - 3.14.10
- RHSA-2026:99023Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Quay - 3.15.9
- RHSA-2026:99022Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Quay - 3.16.7
- RHSA-2026:99021Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Quay - 3.9.28
- RHSA-2026:99019Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Quay - 3.18.3
- +12 more
Patch Availability(29)
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)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python-urllib3 | 1.26.12-1 ... 2.8.0-2 (28 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python-urllib3 | 2.3.0-3 ... 2.8.0-2 (13 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python-urllib3 | 2.3.0-3 ... 2.7.0-3 (9 versions) |
| — |
PyPI(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| urllib3 | 1.26.0 ... 2.7.0 (46 versions) |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(24)
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.
- Microsoft MSRCCVE-2026-976872026-10-03
Microsoft security update for CVE-2026-97687
- Red HatRHSA-2026:69612IMPORTANT2026-09-29
RHSA-2026:69612 — Important
- Red HatRHSA-2026:82059IMPORTANT2026-09-29
RHSA-2026:82059 — Important
- Red HatRHSA-2026:82061IMPORTANT2026-09-29
RHSA-2026:82061 — Important
- Red HatRHSA-2026:82368IMPORTANT2026-09-29
RHSA-2026:82368 — Important
- Red HatRHSA-2026:82371IMPORTANT2026-09-29
RHSA-2026:82371 — Important
- Red HatRHSA-2026:82415IMPORTANT2026-09-29
RHSA-2026:82415 — Important
- Red HatRHSA-2026:83112IMPORTANT2026-09-29
RHSA-2026:83112 — Important
- Red HatRHSA-2026:83114IMPORTANT2026-09-29
RHSA-2026:83114 — Important
- Red HatRHSA-2026:83116IMPORTANT2026-09-29
RHSA-2026:83116 — Important
- Red HatRHSA-2026:83120IMPORTANT2026-09-29
RHSA-2026:83120 — Important
- Red HatRHSA-2026:83121IMPORTANT2026-09-29
RHSA-2026:83121 — Important
- Red HatRHSA-2026:84577IMPORTANT2026-09-29
RHSA-2026:84577 — Important
- Red HatRHSA-2026:84578IMPORTANT2026-09-29
RHSA-2026:84578 — Important
- Red HatRHSA-2026:84785IMPORTANT2026-09-29
RHSA-2026:84785 — Important
- Red HatRHSA-2026:85929IMPORTANT2026-09-29
RHSA-2026:85929 — Important
- Red HatRHSA-2026:87120IMPORTANT2026-09-29
RHSA-2026:87120 — Important
- Red HatRHSA-2026:87124IMPORTANT2026-09-29
RHSA-2026:87124 — Important
- Red HatRHSA-2026:90432IMPORTANT2026-09-29
RHSA-2026:90432 — Important
- Red HatRHSA-2026:90440IMPORTANT2026-09-29
RHSA-2026:90440 — Important
- Red HatRHSA-2026:90494IMPORTANT2026-09-29
RHSA-2026:90494 — Important
- Red HatRHSA-2026:92449IMPORTANT2026-09-29
RHSA-2026:92449 — Important
- Red HatRHSA-2026:92452IMPORTANT2026-09-29
RHSA-2026:92452 — Important
- Red HatRHSA-2026:92474IMPORTANT2026-09-29
RHSA-2026:92474 — Important
Data Freshness Timeline
(refreshed 11× in last 7d / 39× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.
Showing the most recent 100 of 115 rows 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 15 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-13 16:58 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-12 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-11 04:03 UTCEchelonGraph re-scored
- 2026-11-11 04:03 UTCVendor advisory
- 2026-11-11 04:03 UTCGHSA enrichmentGHSA-8988-9cw3-xx77 · GitHub severity HIGH
- 2026-11-10 16:46 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-10 14:26 UTCEchelonGraph re-scored
- 2026-11-10 14:26 UTCVendor advisory
- 2026-11-10 14:26 UTCGHSA enrichmentGHSA-8988-9cw3-xx77 · GitHub severity HIGH
- 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-06 16:40 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-03 20:25 UTCEchelonGraph re-scored
- 2026-11-03 20:25 UTCVendor advisory
- 2026-11-03 20:25 UTCGHSA enrichmentGHSA-8988-9cw3-xx77 · GitHub severity HIGH
- 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-03 15:49 UTCEchelonGraph re-scored
- 2026-11-03 15:49 UTCVendor advisory
- 2026-11-03 15:49 UTCGHSA enrichmentGHSA-8988-9cw3-xx77 · GitHub severity HIGH
- 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.2% · 10th percentile
Show 75 moreShow fewer
- 2026-11-01 07:37 UTCGHSA enrichmentGHSA-8988-9cw3-xx77 · GitHub severity HIGH
- 2026-11-01 07:37 UTCEchelonGraph re-scored
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-27 20:27 UTCEchelonGraph re-scored
- 2026-10-27 20:27 UTCVendor advisory
- 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-25 13:47 UTCEchelonGraph re-scored
- 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-20 17:41 UTCEchelonGraph re-scored
- 2026-10-20 17:41 UTCVendor advisory
- 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-18 02:56 UTCEchelonGraph re-scored
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-13 20:46 UTCEchelonGraph re-scored▲ 0.50
- 2026-10-13 20:46 UTCVendor advisory
- 2026-10-13 20:44 UTCNVD updateCVSS v3 → 8.1
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-13 04:01 UTCEchelonGraph re-scored
- 2026-10-13 04:01 UTCVendor advisory
- 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-12 14:39 UTCEchelonGraph re-scored
- 2026-10-11 19:10 UTCEchelonGraph re-scored
- 2026-10-11 18:05 UTCVendor advisory
- 2026-10-11 16:26 UTCEchelonGraph re-scored
- 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-11 13:38 UTCEchelonGraph re-scored
- 2026-10-11 06:44 UTCEchelonGraph re-scored
- 2026-10-11 06:44 UTCVendor advisory
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-10 19:24 UTCVendor advisory
- 2026-10-10 08:05 UTCVendor advisory
- 2026-10-09 20:45 UTCEchelonGraph re-scored
- 2026-10-09 20:45 UTCVendor advisory
- 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-09 09:27 UTCVendor advisory
- 2026-10-08 22:08 UTCEchelonGraph re-scored
- 2026-10-08 22:08 UTCVendor advisory
- 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-08 10:49 UTCEchelonGraph re-scored
- 2026-10-08 10:49 UTCVendor advisory
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-07 23:30 UTCVendor advisory
- 2026-10-07 12:12 UTCVendor advisory
- 2026-10-07 00:51 UTCEchelonGraph re-scored
- 2026-10-07 00:51 UTCVendor advisory
- 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-06 13:18 UTCVendor advisory
- 2026-10-06 02:00 UTCEchelonGraph re-scored
- 2026-10-06 02:00 UTCVendor advisory
- 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-05 14:40 UTCVendor advisory
- 2026-10-05 03:22 UTCEchelonGraph re-scored
- 2026-10-05 03:22 UTCVendor advisory
- 2026-10-04 23:23 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-04 16:03 UTCVendor advisory
- 2026-10-04 04:43 UTCVendor advisory
- 2026-10-03 17:24 UTCEchelonGraph re-scored
- 2026-10-03 17:24 UTCVendor advisory
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-03 06:06 UTCVendor advisory
- 2026-10-02 18:47 UTCEchelonGraph re-scored
- 2026-10-02 18:47 UTCVendor advisory
- 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-02 07:27 UTCVendor advisory
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:12:python-urllib3
Same vendor
10 shownredhat:RHSA-2026:69612 · redhat:RHSA-2026:82059 · redhat:RHSA-2026:82371
Frequently asked(5)
What is CVE-2026-97687?
When was the CVE record for CVE-2026-97687 published?
Is CVE-2026-97687 actively exploited?
What is the CVSS score of CVE-2026-97687?
How do I remediate CVE-2026-97687?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-97687
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