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01 Record

CVE-2026-40253

openCryptoki: Memory safety vulnerabilities in BER/DER decoders in asn1.c

MediumPUBLISHEDCNA: GitHub_M
CNA base score6.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
View raw JSON

02 Description

openCryptoki: Memory safety vulnerabilities in BER/DER decoders in asn1.c

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.16% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 4.7% of scored records. A rank, not a probability.
NVD base score
6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-04-16 22:04Z6 MO AGO
Last updated
2026-04-17 12:27Z6 MO AGO
Reserved
2026-04-10
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 6.8)
CNA CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Weaknesses
Data version
5.2
Document digest
f771d3ce813509f6a02005001f1b03cb0fd1116e0a621c41787e3a7dd3c8f876

05 Affected products

VendorProductVersionsPlatforms
opencryptokiopencryptoki<= 3.26.0—

06 References

07 Fixed in

AlmaLinux 8

  • opencryptoki
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-ccatok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-devel
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-ep11tok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-icatok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-icsftok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-libs
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-swtok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-tpmtok
    Fixed in 3.22.0-3.el8_10.3

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • opencryptoki
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-ccatok
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-devel
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-ep11tok
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-icatok
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-icsftok
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-libs
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-swtok
    Fixed in 3.26.0-2.el9_8.2

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • opencryptoki
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-ccatok
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-devel
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-ep11tok
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-icatok
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-icsftok
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-libs
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-swtok
    Fixed in 3.26.0-3.el10_2.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • opencryptoki
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-ccatok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-devel
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-ep11tok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-icatok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-icsftok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-libs
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-swtok
    Fixed in 3.22.0-3.el8_10.3
  • opencryptoki-tpmtok
    Fixed in 3.22.0-3.el8_10.3

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • opencryptoki
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-ccatok
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-devel
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-ep11tok
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-icatok
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-icsftok
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-libs
    Fixed in 3.26.0-2.el9_8.2
  • opencryptoki-swtok
    Fixed in 3.26.0-2.el9_8.2

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • opencryptoki
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-ccatok
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-devel
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-ep11tok
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-icatok
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-icsftok
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-libs
    Fixed in 3.26.0-3.el10_2.1
  • opencryptoki-swtok
    Fixed in 3.26.0-3.el10_2.1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • opencryptoki
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • opencryptoki
    Fixed in 3.23.0+dfsg-0.3+deb13u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • opencryptoki
    Fixed in 3.27.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • opencryptoki
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • opencryptoki
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • opencryptoki
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • opencryptoki
    Fixed in 3.17.0+dfsg+20220202.b40982e-0ubuntu1.3

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • opencryptoki
    Fixed in 3.23.0+dfsg-0ubuntu3.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • opencryptoki
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • opencryptoki
    Fixed in 3.26.0+dfsg-0ubuntu1.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.