CVE-2026-97689

HIGHPre-NVD 8.98.9—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (19th 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
8.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

urllib3 is an HTTP client library for Python. From 1.10.3 until 2.8.0, the HTTPResponse.read_chunked and HTTPResponse.stream methods can allocate unbounded memory because the streaming chunk parser buffers the chunk-size field until newline or EOF without a length bound. The trigger is that a malicious server returns Transfer-Encoding: chunked followed by a very long run of bytes without a newline. The attack mechanism is that a malicious HTTP server sends a very long unterminated chunk-size line. The impact is that unbounded memory allocation can exhaust the client process. This issue is fixed in version 2.8.0.

CVSS v3
8.9
EG Score
8.9HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity89% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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 (3)

Auto-updated Sep 29, 2026
Patch available. Sources: github_commit, github_release, github.
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 cd770b059b54 (urllib3/urllib3)

Patch available: urllib3/urllib3 2.8.0 (contains commit cd770b059b54)

https://github.com/urllib3/urllib3/commit/cd770b059b543be29298ea5c52afb0b1b090f5ed
github Patch Available

HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into memory · Advisory · urllib3/urllib3 · GitHub

https://github.com/urllib3/urllib3/security/advisories/GHSA-vxq7-64xx-v4gw

Vendor Advisories for CVE-2026-97689(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
urllib31.10.3 ... 2.7.0 (82 versions)2.8.0—

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 21× in last 7d / 21× 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 04:15 UTCVendor advisory
  2. 2026-10-03 16:45 UTCEG score recompute
  3. 2026-10-03 16:45 UTCVendor advisory
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-03 05:16 UTCEG score recompute
  6. 2026-10-03 05:16 UTCVendor advisory
  7. 2026-10-02 17:57 UTCEPSS rescore
  8. 2026-10-02 17:45 UTCVendor advisory
  9. 2026-10-02 06:15 UTCEG score recompute
  10. 2026-10-02 06:15 UTCVendor advisory
  11. 2026-10-01 19:51 UTCEPSS rescore
  12. 2026-10-01 18:46 UTCVendor advisory
  13. 2026-10-01 07:14 UTCVendor advisory
  14. 2026-09-30 19:45 UTCVendor advisory
  15. 2026-09-30 16:34 UTCEG score recompute
  16. 2026-09-30 16:34 UTCVendor advisory
  17. 2026-09-30 15:04 UTCEPSS rescore
  18. 2026-09-29 17:32 UTCEG score recompute
  19. 2026-09-29 16:28 UTCEG score recompute
  20. 2026-09-29 15:38 UTCEG score recompute
  21. 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-2026-97689?
CVE-2026-97689 is a high vulnerability published on September 29, 2026. urllib3 is an HTTP client library for Python. From 1.10.3 until 2.8.0, the HTTPResponse.read_chunked and HTTPResponse.stream methods can allocate unbounded memory because the streaming chunk parser buffers the chunk-size field until newline or EOF without a length bound. The trigger is that a…
When was CVE-2026-97689 disclosed?
CVE-2026-97689 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-2026-97689 actively exploited?
CVE-2026-97689 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-97689?
CVE-2026-97689 has a CVSS base score of 8.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-97689?
A fix for CVE-2026-97689 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-97689 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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