openCryptoki: Memory safety vulnerabilities in BER/DER decoders in asn1.c
openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: ber_decode_INTEGER, ber_decode_SEQUENCE, ber_decode_OCTET_STRING, ber_decode_BIT_STRING, and ber_decode_CHOICE. Additionally, ber_decode_INTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as C_CreateObject or C_UnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3.
- ALSA-2026:26352
- ALSA-2026:28231
- ALSA-2026:28256
- openSUSE-SU-2026:10593-1
- openSUSE-SU-2026:21059-1
- RHSA-2026:26352
- RHSA-2026:28231
- RHSA-2026:28256
- RHSA-2026:33519
- RHSA-2026:36697
- RHSA-2026:36717
- RLSA-2026:26352
- RLSA-2026:28231
- RLSA-2026:28256
- SUSE-SU-2026:22293-1
- SUSE-SU-2026:22365-1
- SUSE-SU-2026:2355-1
- SUSE-SU-2026:2685-1
- SUSE-SU-2026:2685-2
- SUSE-SU-2026:2757-1
- Published
- Apr 16, 2026
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 5th percentile
- CWE
- CWE-125
Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.
Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 6.1
- CNA · GitHub_M
- 6.8
- 0.7 point gap
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| opencryptoki project | opencryptoki | cpe:2.3:a:opencryptoki_project:opencryptoki |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- opencryptoki project opencryptokiup to 3.26.0 inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
opencryptoki opencryptoki
- <= 3.26.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | opencryptoki | before 3.26.0-3.el10_2.1 | 3.26.0-3.el10_2.1 |
| AlmaLinux:10 | opencryptoki-ccatok | before 3.26.0-3.el10_2.1 | 3.26.0-3.el10_2.1 |
| AlmaLinux:10 | opencryptoki-devel | before 3.26.0-3.el10_2.1 | 3.26.0-3.el10_2.1 |
| AlmaLinux:10 | opencryptoki-ep11tok | before 3.26.0-3.el10_2.1 | 3.26.0-3.el10_2.1 |
| AlmaLinux:10 | opencryptoki-icatok | before 3.26.0-3.el10_2.1 | 3.26.0-3.el10_2.1 |
| AlmaLinux:10 | opencryptoki-icsftok | before 3.26.0-3.el10_2.1 | 3.26.0-3.el10_2.1 |
| AlmaLinux:10 | opencryptoki-libs | before 3.26.0-3.el10_2.1 | 3.26.0-3.el10_2.1 |
| AlmaLinux:10 | opencryptoki-swtok | before 3.26.0-3.el10_2.1 | 3.26.0-3.el10_2.1 |
| AlmaLinux:8 | opencryptoki | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:8 | opencryptoki-ccatok | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:8 | opencryptoki-devel | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:8 | opencryptoki-ep11tok | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:8 | opencryptoki-icatok | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:8 | opencryptoki-icsftok | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:8 | opencryptoki-libs | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:8 | opencryptoki-swtok | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:8 | opencryptoki-tpmtok | before 3.22.0-3.el8_10.3 | 3.22.0-3.el8_10.3 |
| AlmaLinux:9 | opencryptoki | before 3.26.0-2.el9_8.2 | 3.26.0-2.el9_8.2 |
| AlmaLinux:9 | opencryptoki-ccatok | before 3.26.0-2.el9_8.2 | 3.26.0-2.el9_8.2 |
| AlmaLinux:9 | opencryptoki-devel | before 3.26.0-2.el9_8.2 | 3.26.0-2.el9_8.2 |
| AlmaLinux:9 | opencryptoki-ep11tok | before 3.26.0-2.el9_8.2 | 3.26.0-2.el9_8.2 |
| AlmaLinux:9 | opencryptoki-icatok | before 3.26.0-2.el9_8.2 | 3.26.0-2.el9_8.2 |
| AlmaLinux:9 | opencryptoki-icsftok | before 3.26.0-2.el9_8.2 | 3.26.0-2.el9_8.2 |
| AlmaLinux:9 | opencryptoki-libs | before 3.26.0-2.el9_8.2 | 3.26.0-2.el9_8.2 |
+96
Same product
opencryptoki project: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-23893openCryptoki has improper link resolution before file access (link following)27Monitor
- CVE-2026-22791openCryptoki incorrectly calculates the buffer size in C_WrapKey with CKM_ECDH_AES_KEY_WRAP24Monitor
- CVE-2012-4455openCryptoki 2.4.1 allows local users to create or set world-writable permissions on arbitrary files via a symlink attack on the (1) LCK..op24Monitor
- CVE-2024-0914Opencryptoki: timing side-channel in handling of rsa pkcs#1 v1.5 padded ciphertexts (marvin)23Monitor
- CVE-2021-3798A flaw was found in openCryptoki.22Monitor
- CVE-2012-4454openCryptoki before 2.4.1, when using spinlocks, allows local users to create or set world-writable permissions on arbitrary files via a sym11Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:opencryptoki | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:opencryptoki-ccatok | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:opencryptoki-devel | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:opencryptoki-ep11tok | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:opencryptoki-icatok | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:opencryptoki-icsftok | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:opencryptoki-libs | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:opencryptoki-swtok | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:opencryptoki-tpmtok | 3.22.0-3.el8_10.3 · AlmaLinux:8 | Package registry (OSV) |
| debian:opencryptoki | 3.23.0+dfsg-0.3+deb13u1 · Debian:13 | Package registry (OSV) |
| opensuse:openCryptoki | 3.26.0-6.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:opencryptoki | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-ccatok | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-ccatok-debuginfo | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-debuginfo | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-debugsource | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-ep11tok | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-ep11tok-debuginfo | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-icatok | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-icatok-debuginfo | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-icsftok | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-icsftok-debuginfo | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:opencryptoki-libs | 0:3.22.0-3.el8_10.3 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| rocky linux:opencryptoki | 0:3.22.0-3.el8_10.3 · Rocky Linux:8 | Package registry (OSV) |
| suse:openCryptoki | 3.27.0-160000.1.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.