CVE-2026-97689

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3% (26th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-89017 (ENISA EUVD) · GHSA-vxq7-64xx-v4gw (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: 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
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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.
Exploitation0.3% × 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 every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.3%
EPSS %ILE
26th
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.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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 every mission impact level.CISA BOD 26-04: 60 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 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). 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)60 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 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

September 29, 2026

Last Modified

October 13, 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 advisoryMentions a patch (unverified)

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(20)

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

Patch Availability(20)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython3-urllib3 (2.6.3-1ubuntu1.2) @ resolute2026-10-27ubuntu
redhatpython-urllib3-0:1.26.5-8.el9_8.22026-10-26redhat
redhatansible-automation-platform-27/lightspeed-rhel9:17921413862026-10-21redhat
redhatansible-automation-platform-26/lightspeed-rhel9:17918984032026-10-21redhat
redhatpython3.12-urllib3-0:1.26.19-3.el9_8.22026-10-20redhat
redhatrhtas/model-transparency-rhel9:17924027392026-10-19redhat
redhatpython3.14-urllib3-0:2.6.3-2.el10_2.62026-10-19redhat
redhatpython3.14-urllib3-0:2.6.3-2.el9_8.62026-10-19redhat
redhatrhaii/model-opt-cuda-rhel9:17918571102026-10-14redhat
redhatrhaii/vllm-cpu-rhel9:17918573012026-10-14redhat
redhatrhaii/vllm-spyre-rhel9:17918585922026-10-14redhat
redhatrhaii/vllm-cuda-rhel9:17918571832026-10-14redhat
redhatrhaii/vllm-rocm-rhel9:17918567252026-10-14redhat
redhatrhaii/vllm-gaudi-rhel9:17914271822026-10-13redhat
redhatrhaii/vllm-cuda-rhel9:17914736312026-10-13redhat
redhatrhaii/vllm-spyre-rhel9:17918183572026-10-13redhat
redhatrhaii/vllm-cpu-rhel9:17914736142026-10-13redhat
redhatrhaii/vllm-rocm-rhel9:17914258692026-10-13redhat
redhatpython-urllib3-main-2.8.0-1.hum12026-09-21redhat
pipurllib3 @ 2.8.0 (fixes >= 1.10.3, < 2.8.0)—ghsa

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)
PackageVulnerable rangeFix by version rangeDependents
python-urllib31.26.12-1 ... 2.8.0-1 (27 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib32.3.0-3 ... 2.8.0-1 (12 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib32.3.0-3 ... 2.7.0-3 (9 versions)
  • every version up to 2.8.0-1: fixed in 2.8.0-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
urllib31.10.3 ... 2.7.0 (82 versions)
  • 1.10.3 up to 2.8.0: fixed in 2.8.0
—

Weakness Classification(1)

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

Additional Vendor Advisories

(8)

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 11× in last 7d / 73× 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 0.3% · 26th percentile
  2. 2026-11-01 07:37 UTCEG score recompute
  3. 2026-11-01 07:37 UTCGHSA enrichmentGHSA-vxq7-64xx-v4gw · GitHub severity HIGH
  4. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  5. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  6. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  7. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  8. 2026-10-27 21:12 UTCEG score recompute
  9. 2026-10-27 21:12 UTCVendor advisory
  10. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  11. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  12. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  13. 2026-10-25 13:47 UTCEG score recompute
  14. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  15. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  16. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  17. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  18. 2026-10-20 17:41 UTCEG score recompute
  19. 2026-10-20 17:41 UTCVendor advisory
  20. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  21. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  22. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  23. 2026-10-18 02:56 UTCEG score recompute
  24. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.3% · 25th percentile
Show 65 more
  1. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-10-13 20:27 UTCEG score recompute▼ 1.40
  4. 2026-10-13 20:27 UTCVendor advisory
  5. 2026-10-13 20:24 UTCNVD updateCVSS v3 → 7.5
  6. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  7. 2026-10-13 04:01 UTCEG score recompute
  8. 2026-10-13 04:01 UTCVendor advisory
  9. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-10-12 14:39 UTCEG score recompute
  11. 2026-10-11 21:38 UTCVendor advisory
  12. 2026-10-11 19:10 UTCEG score recompute
  13. 2026-10-11 16:26 UTCEG score recompute
  14. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  15. 2026-10-11 13:38 UTCEG score recompute
  16. 2026-10-11 10:08 UTCVendor advisory
  17. 2026-10-10 22:35 UTCEG score recompute
  18. 2026-10-10 22:35 UTCVendor advisory
  19. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-10-10 10:58 UTCVendor advisory
  21. 2026-10-09 23:29 UTCEG score recompute
  22. 2026-10-09 23:29 UTCVendor advisory
  23. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  24. 2026-10-09 11:59 UTCVendor advisory
  25. 2026-10-08 23:24 UTCEG score recompute
  26. 2026-10-08 23:24 UTCVendor advisory
  27. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  28. 2026-10-08 11:54 UTCVendor advisory
  29. 2026-10-08 00:17 UTCEG score recompute
  30. 2026-10-08 00:17 UTCVendor advisory
  31. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  32. 2026-10-07 12:47 UTCVendor advisory
  33. 2026-10-07 01:15 UTCEG score recompute
  34. 2026-10-07 01:15 UTCVendor advisory
  35. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  36. 2026-10-06 13:45 UTCVendor advisory
  37. 2026-10-06 02:15 UTCEG score recompute
  38. 2026-10-06 02:15 UTCVendor advisory
  39. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  40. 2026-10-05 14:44 UTCVendor advisory
  41. 2026-10-05 03:15 UTCEG score recompute
  42. 2026-10-05 03:15 UTCVendor advisory
  43. 2026-10-04 23:23 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  44. 2026-10-04 15:45 UTCVendor advisory
  45. 2026-10-04 04:15 UTCVendor advisory
  46. 2026-10-03 16:45 UTCEG score recompute
  47. 2026-10-03 16:45 UTCVendor advisory
  48. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  49. 2026-10-03 05:16 UTCEG score recompute
  50. 2026-10-03 05:16 UTCVendor advisory
  51. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  52. 2026-10-02 17:45 UTCVendor advisory
  53. 2026-10-02 06:15 UTCEG score recompute
  54. 2026-10-02 06:15 UTCVendor advisory
  55. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  56. 2026-10-01 18:46 UTCVendor advisory
  57. 2026-10-01 07:14 UTCVendor advisory
  58. 2026-09-30 19:45 UTCVendor advisory
  59. 2026-09-30 16:34 UTCEG score recompute
  60. 2026-09-30 16:34 UTCVendor advisory
  61. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  62. 2026-09-29 17:32 UTCEG score recompute
  63. 2026-09-29 16:28 UTCEG score recompute
  64. 2026-09-29 15:38 UTCEG score recomputeFirst assessed: 8.9 HIGH
  65. 2026-09-29 15:38 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-97689?
CVE-2026-97689 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-97689 published?
The CVE record for CVE-2026-97689 was published on September 29, 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 13, 2026; the record at its source may have been updated since.
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 (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-97689?
CVE-2026-97689 has a CVSS v3 base score of 7.5 (NVD).
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.

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