CVE-2026-114616

CRITICALNVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.3% (22nd percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 7.4 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-10-27) is not newer than that change (2026-10-30), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2026-108517 (ENISA EUVD) · GHSA-8m4g-j4wp-wgcg (GitHub Security Advisories) · PYSEC-2026-4356 (OSV.dev)Source: ENISA EUVD

9.1EG
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: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute the deterministic HS256, HS384, or HS512 signature for arbitrary token claims and have Authlib treat the token as authentic. This issue is fixed in version 1.9.1.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
41
EG Risk 41/100

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)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 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 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
0.3%
EPSS %ILE
22nd
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 (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-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 2026-11-11). 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

October 22, 2026

Last Modified

October 30, 2026

Advisory Details (3)

Auto-updated Oct 22, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

v1.9.1

Patch available: authlib/authlib v1.9.1

https://github.com/authlib/authlib/releases/tag/v1.9.1
GitHub commit Patch Available

commit 4ff30db442c7 (authlib/authlib)

Patch available: authlib/authlib v1.9.1 (contains commit 4ff30db442c7)

https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b
GitHub advisoryMentions a patch (unverified)

Authlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512) · Advisory · authlib/authlib · GitHub

https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg

Vendor Advisories for CVE-2026-114616(3)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatsatellite/foreman-mcp-server-rhel9:17932722762026-10-29redhat
redhatsatellite/foreman-mcp-server-rhel9:17932722792026-10-29redhat
pipAuthlib @ 1.9.1 (fixes < 1.9.1)—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-authlib1.2.0-1 ... 1.9.1-1 (28 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-authlib1.6.0-1 ... 1.9.1-1 (14 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-authlib1.6.0-1 ... 1.7.2-2 (12 versions)
  • every version up to 1.9.1-1: fixed in 1.9.1-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
authlib0.1 ... 1.9.0 (65 versions)
  • every version up to 1.9.1: fixed in 1.9.1
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 49× 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.

  1. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-11-12 10:08 UTCEchelonGraph re-scored
  3. 2026-11-12 10:08 UTCVendor advisory
  4. 2026-11-12 10:08 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  5. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  6. 2026-11-11 10:52 UTCEchelonGraph re-scored
  7. 2026-11-11 10:52 UTCVendor advisory
  8. 2026-11-11 10:52 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  9. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  10. 2026-11-10 11:40 UTCEchelonGraph re-scored
  11. 2026-11-10 11:40 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  12. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  13. 2026-11-09 12:28 UTCEchelonGraph re-scored
  14. 2026-11-09 12:28 UTCVendor advisory
  15. 2026-11-09 12:28 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  16. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-11-08 13:16 UTCEchelonGraph re-scored
  18. 2026-11-08 13:16 UTCVendor advisory
  19. 2026-11-08 13:16 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  20. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  21. 2026-11-07 14:04 UTCEchelonGraph re-scored
  22. 2026-11-07 14:04 UTCVendor advisory
  23. 2026-11-07 14:04 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  24. 2026-11-06 16:36 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  25. 2026-11-06 14:51 UTCEchelonGraph re-scored
Show 44 more
  1. 2026-11-06 14:51 UTCVendor advisory
  2. 2026-11-06 14:51 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  3. 2026-11-05 23:25 UTCOSV refresh
  4. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  5. 2026-11-05 15:39 UTCEchelonGraph re-scored
  6. 2026-11-05 15:39 UTCVendor advisory
  7. 2026-11-05 15:39 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  8. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  9. 2026-11-04 16:26 UTCVendor advisory
  10. 2026-11-04 16:26 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  11. 2026-11-03 17:14 UTCEchelonGraph re-scored
  12. 2026-11-03 17:14 UTCVendor advisory
  13. 2026-11-03 17:14 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  14. 2026-11-03 16:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  15. 2026-11-02 18:02 UTCEchelonGraph re-scored
  16. 2026-11-02 18:02 UTCVendor advisory
  17. 2026-11-02 18:02 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  18. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-11-01 18:50 UTCEchelonGraph re-scored
  20. 2026-11-01 18:50 UTCVendor advisory
  21. 2026-11-01 18:50 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  22. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-11-01 07:59 UTCGHSA enrichmentGHSA-8m4g-j4wp-wgcg · GitHub severity HIGH · GitHub CVSS 7.4
  24. 2026-11-01 07:59 UTCEchelonGraph re-scored
  25. 2026-10-31 19:38 UTCEchelonGraph re-scored
  26. 2026-10-31 19:38 UTCVendor advisory
  27. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  28. 2026-10-30 20:14 UTCEchelonGraph re-scored
  29. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  30. 2026-10-30 14:18 UTCEchelonGraph re-scored
  31. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  32. 2026-10-29 15:06 UTCEchelonGraph re-scored▲ 1.70
  33. 2026-10-29 15:06 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  34. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  35. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  36. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  37. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  38. 2026-10-25 14:50 UTCEchelonGraph re-scored
  39. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  40. 2026-10-23 19:47 UTCEchelonGraph re-scored
  41. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  42. 2026-10-22 22:28 UTCEchelonGraph re-scored
  43. 2026-10-22 21:28 UTCEchelonGraph re-scoredFirst assessed: 7.4 HIGH
  44. 2026-10-22 21:25 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-114616?
CVE-2026-114616 is a critical-severity vulnerability; its CVE record was published on October 22, 2026. Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute…
When was the CVE record for CVE-2026-114616 published?
The CVE record for CVE-2026-114616 was published on October 22, 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 30, 2026; the record at its source may have been updated since.
Is CVE-2026-114616 actively exploited?
CVE-2026-114616 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-114616?
CVE-2026-114616 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-114616?
A fix for CVE-2026-114616 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-114616 are linked in the Vendor Advisories panel on this page.

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