CVE-2025-61920

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (49th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
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: 0.6%CVSS: 7.5Exploit: 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 version 1.6.5, Authlib’s JOSE implementation accepts unbounded JWS/JWT header and signature segments. A remote attacker can craft a token whose base64url‑encoded header or signature spans hundreds of megabytes. During verification, Authlib decodes and parses the full input before it is rejected, driving CPU and memory consumption to hostile levels and enabling denial of service. Version 1.6.5 patches the issue. Some temporary workarounds are available. Enforce input size limits before handing tokens to Authlib and/or use application-level throttling to reduce amplification risk.

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 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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.6% × 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
0.6%
EPSS %ILE
49th
KEV
Not listed

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.

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

October 10, 2025

Last Modified

June 17, 2026

References (3)

Vendor Advisories for CVE-2025-61920(9)

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

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython3-authlib (0.15.5-1ubuntu0.1~esm1) @ jammy2026-05-29ubuntu
redhatquay/quay-rhel8:17730976212026-03-10redhat
redhatquay/quay-rhel8:v3.13.10-17657823912025-12-15redhat
redhatquay/quay-rhel8:3.12-17653826022025-12-10redhat
redhatquay/quay-rhel8:3.12-17653815022025-12-10redhat
redhatquay/quay-rhel8:3.10.17-17653841442025-12-10redhat
redhatquay/quay-rhel8:3.12-17653615932025-12-10redhat
redhatquay/quay-rhel8:3.9-17653827582025-12-10redhat
redhatquay/quay-rhel8:3.9-17642547562025-11-27redhat
redhatquay/quay-rhel8:3.10.17-17641684282025-11-26redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python-authlib0.15.4-1
  • every version up to 0.15.4-1+deb11u1: fixed in 0.15.4-1+deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python-authlib1.2.0-1
  • every version up to 1.2.0-1+deb12u1: fixed in 1.2.0-1+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-authlib1.6.0-1
  • every version up to 1.6.0-1+deb13u1: fixed in 1.6.0-1+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-authlib1.6.0-1, 1.6.1-1, 1.6.3-1, 1.6.4-1
  • every version up to 1.6.5-1: fixed in 1.6.5-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
authlib0.1 ... 1.6.4 (52 versions)
  • every version up to 1.6.5: fixed in 1.6.5
—

Weakness Classification(3)

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 11× in last 7d / 30× 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.

Showing the most recent 91 of 174 refreshes 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. 9 repeat rows among the latest 100 are merged into the row they repeat. The 83 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  2. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  4. 2026-10-12 16:51 UTCEG score recompute
  5. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  6. 2026-10-11 20:26 UTCEG score recompute
  7. 2026-10-11 18:37 UTCEG score recompute
  8. 2026-10-11 15:13 UTCEG score recompute
  9. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  10. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  11. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  12. 2026-10-08 17:10 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  15. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  16. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-10-02 03:10 UTCOSV refresh
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  20. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  21. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  24. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  25. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.6% · 49th percentile
Show 66 more
  1. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  2. 2026-09-19 15:42 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  3. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  4. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-09-15 03:10 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  7. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-09-12 20:36 UTCOSV refresh
  9. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  11. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  12. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  16. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  17. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  18. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  19. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  20. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  21. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  22. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  23. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  24. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  25. 2026-08-25 01:56 UTCOSV refresh
  26. 2026-08-24 14:16 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  27. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  28. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  29. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  30. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  31. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  32. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  33. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  34. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  35. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  36. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  37. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  38. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  39. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  40. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  41. 2026-08-08 18:55 UTCOSV refresh
  42. 2026-08-08 16:36 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  43. 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  44. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  45. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  46. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  47. 2026-08-04 10:37 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  48. 2026-08-03 10:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  49. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  50. 2026-08-01 04:15 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  51. 2026-07-30 16:27 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  52. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  53. 2026-07-28 15:35 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  54. 2026-07-27 14:12 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  55. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  56. 2026-07-25 14:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  57. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  58. 2026-07-23 17:41 UTCOSV refresh
  59. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  60. 2026-07-23 03:00 UTCEG score recompute
  61. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  62. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  63. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  64. 2026-07-19 14:30 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  65. 2026-07-19 02:28 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  66. 2026-07-18 10:04 UTCEPSS rescoreEPSS 0.6% · 44th percentile

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

Frequently asked(5)

What is CVE-2025-61920?
CVE-2025-61920 is a high-severity vulnerability; its CVE record was published on October 10, 2025. Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JOSE implementation accepts unbounded JWS/JWT header and signature segments. A remote attacker can craft a token whose base64url‑encoded header or signature spans hundreds of megabytes.…
When was the CVE record for CVE-2025-61920 published?
The CVE record for CVE-2025-61920 was published on October 10, 2025. 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 June 17, 2026; the record at its source may have been updated since.
Is CVE-2025-61920 actively exploited?
CVE-2025-61920 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-61920?
CVE-2025-61920 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2025-61920?
A fix for CVE-2025-61920 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-61920 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-61920

Explore →

Is Your Infrastructure Affected by CVE-2025-61920?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs