CVE-2026-23490

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 the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.8% (54th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from the CNA's CVSS
Sources: the CNA's CVSS, EPSS
Elevated
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
54th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

January 16, 2026

Last Modified

September 17, 2026

Advisory Details (10)

Auto-updated Jul 3, 2026
Patch available. Sources: redhat, github_commit, github_release, github.
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:17446
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:14020
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:13553
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:13545
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:13512
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:13508
Web pageMentions a patch (unverified)

[SECURITY] [DLA 4463-1] pyasn1 security update

https://lists.debian.org/debian-lts-announce/2026/02/msg00002.html
GitHub advisoryMentions a patch (unverified)

DoS vulnerability in decoder · Advisory · pyasn1/pyasn1 · GitHub

https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq
GitHub release Patch Available

Release 0.6.2

Patch available: pyasn1/pyasn1 v0.6.2

https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2
GitHub commit Patch Available

commit 3908f144229e (pyasn1/pyasn1)

Patch available: pyasn1/pyasn1 v0.6.2 (contains commit 3908f144229e)

https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970

Vendor Advisories for CVE-2026-23490(20)

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

Patch Availability(28)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatpython-pyasn1-0:0.4.6-4.el8ost2026-08-13redhat
redhatrhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9:17836154322026-07-21redhat
redhatrhmtc/openshift-migration-hook-runner-rhel8:17839317222026-07-20redhat
redhatrhoso-operators/ee-openstack-ansible-ee-rhel9:17823875492026-07-15redhat
redhatrhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9:17824716972026-07-09redhat
redhatrhaiis/vllm-rocm-rhel9:17823530932026-06-25redhat
redhatpython-pyasn1-0:0.4.6-5.el8ost2026-06-22redhat
redhatrhoai/odh-kserve-storage-initializer-rhel9:17800691272026-06-10redhat
redhatansible-automation-platform-26/lightspeed-chatbot-rhel9:17801027322026-06-09redhat
redhatrhtas/segment-reporting-rhel9:17805601172026-06-08redhat
redhatrhtas/model-transparency-rhel9:17809148862026-06-08redhat
redhatrhoai/odh-training-cuda128-torch29-py312-rhel9:17791233342026-05-20redhat
redhatpython-pyasn1-0:0.5.1-4.el92026-05-20redhat
redhatrhelai3/bootc-rocm-rhel9:17786661242026-05-14redhat
redhatstf/smart-gateway-rhel9-operator:17774361502026-05-06redhat
redhatansible-automation-platform-26/ee-supported-rhel9:17773914472026-05-04redhat
redhatpython3.12-pyasn1-0:0.6.3-1.el9ap2026-05-04redhat
redhatansible-automation-platform-25/platform-resource-runner-rhel8:17774022642026-05-04redhat
redhatrhceph/rhceph-8-rhel9:17740028672026-03-24redhat
redhatrhui5/rhua-rhel9:17736701372026-03-18redhat
redhatpython-pyasn1-0:0.3.7-6.el8_8.12026-03-10redhat
redhatpython-pyasn1-0:0.3.7-6.el8_4.12026-03-10redhat
redhatpython-pyasn1-0:0.4.8-6.el9_6.12026-03-10redhat
redhatpython-pyasn1-0:0.3.7-6.el8_2.12026-03-10redhat
redhatpython-pyasn1-0:0.4.8-6.el9_4.12026-03-10redhat
redhatpython-pyasn1-0:0.6.2-1.el10_0.12026-03-10redhat
redhatpython-pyasn1-0:0.3.7-6.el8_6.12026-03-10redhat
redhatpython-pyasn1-0:0.4.8-6.el9_2.12026-03-10redhat

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
pyasn10.4.8-1
  • every version up to 0.4.8-1+deb11u1: fixed in 0.4.8-1+deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
pyasn10.4.8-3
  • every version up to 0.4.8-3+deb12u1: fixed in 0.4.8-3+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
pyasn10.6.1-1
  • every version up to 0.6.1-1+deb13u1: fixed in 0.6.1-1+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
pyasn10.6.1-1, 0.6.2-1~bpo13+1
  • every version up to 0.6.2-1: fixed in 0.6.2-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
pyasn10.6.1
  • 0.6.1 up to 0.6.2: fixed in 0.6.2
—

Weakness Classification(1)

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

Additional Vendor Advisories

(16)

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 / 29× 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 99 of 235 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 136 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  2. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  3. 2026-10-12 16:21 UTCEG score recompute
  4. 2026-10-11 20:03 UTCEG score recompute
  5. 2026-10-11 17:16 UTCEG score recompute
  6. 2026-10-11 14:48 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  10. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  12. 2026-10-07 06:24 UTCOSV refresh
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  14. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  15. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  18. 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  19. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  20. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  21. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  22. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  23. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  25. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.8% · 54th percentile
Show 74 more
  1. 2026-09-17 12:12 UTCEG score recompute
  2. 2026-09-17 12:12 UTCVendor advisory
  3. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  6. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  7. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  8. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  9. 2026-09-09 13:42 UTCEG score recompute
  10. 2026-09-09 13:42 UTCVendor advisory
  11. 2026-09-09 12:41 UTCEG score recompute
  12. 2026-09-09 12:41 UTCVendor advisory
  13. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  15. 2026-09-07 14:07 UTCEG score recompute
  16. 2026-09-07 14:07 UTCVendor advisory
  17. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  19. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  20. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  21. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  22. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  23. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  24. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  26. 2026-08-27 13:37 UTCEG score recompute
  27. 2026-08-27 13:37 UTCVendor advisory
  28. 2026-08-27 13:03 UTCEG score recompute
  29. 2026-08-27 13:03 UTCVendor advisory
  30. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  31. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  32. 2026-08-25 13:26 UTCEG score recompute
  33. 2026-08-25 13:26 UTCVendor advisory
  34. 2026-08-25 12:22 UTCEG score recompute
  35. 2026-08-25 12:22 UTCVendor advisory
  36. 2026-08-24 13:32 UTCEG score recompute
  37. 2026-08-24 13:32 UTCVendor advisory
  38. 2026-08-24 12:28 UTCEG score recompute
  39. 2026-08-24 12:28 UTCVendor advisory
  40. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  41. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  42. 2026-08-21 12:33 UTCEG score recompute
  43. 2026-08-21 12:33 UTCVendor advisory
  44. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  45. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  46. 2026-08-19 12:28 UTCEG score recompute
  47. 2026-08-19 12:28 UTCVendor advisory
  48. 2026-08-19 12:12 UTCEG score recompute
  49. 2026-08-19 12:12 UTCVendor advisory
  50. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  51. 2026-08-18 12:24 UTCEG score recompute
  52. 2026-08-18 12:24 UTCVendor advisory
  53. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  54. 2026-08-17 12:22 UTCEG score recompute
  55. 2026-08-17 12:22 UTCVendor advisory
  56. 2026-08-17 12:14 UTCEG score recompute
  57. 2026-08-17 12:14 UTCVendor advisory
  58. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  59. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  60. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  61. 2026-08-14 13:28 UTCEG score recompute
  62. 2026-08-14 13:28 UTCVendor advisory
  63. 2026-08-14 12:30 UTCEG score recompute
  64. 2026-08-14 12:30 UTCVendor advisory
  65. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  66. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  67. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  68. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  69. 2026-08-10 12:28 UTCEG score recompute
  70. 2026-08-10 12:28 UTCVendor advisory
  71. 2026-08-09 19:27 UTCEG score recompute
  72. 2026-08-09 19:27 UTCVendor advisory
  73. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  74. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.7% · 48th percentile

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

Frequently asked(5)

What is CVE-2026-23490?
CVE-2026-23490 is a high-severity vulnerability; its CVE record was published on January 16, 2026. pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.
When was the CVE record for CVE-2026-23490 published?
The CVE record for CVE-2026-23490 was published on January 16, 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 September 17, 2026; the record at its source may have been updated since.
Is CVE-2026-23490 actively exploited?
CVE-2026-23490 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-23490?
CVE-2026-23490 has a CVSS base score of 7.5 (the CNA's own assessment, by github_m; NVD's own analysis pending).
How do I remediate CVE-2026-23490?
A fix for CVE-2026-23490 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-23490 are linked in the Vendor Advisories panel on this page.

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