CVE catalog
CVE-2026-71225
A flaw was found in libkcapi. When performing one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes such as Counter (CTR) or Cipher Block Chaining (CBC), the library imp
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 25, 2026
A flaw was found in libkcapi. When performing one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes such as Counter (CTR) or Cipher Block Chaining (CBC), the library improperly reuses the Initialization Vector (IV) for each internal data chunk. A remote attacker could potentially exploit this by making an application that uses libkcapi process specially crafted large inputs. This can lead to a significant weakening of data confidentiality, as the repeated IV use can expose relationships in encrypted plaintext, and may also affect data integrity by causing incorrect cryptographic processing.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libkcapi | sid | 1.5.1-2 | fixed |
| Debian | libkcapi | forky | 1.5.1-2 | fixed |
| Debian | libkcapi | trixie | 1.4.0-1 | vulnerable |
| Debian | libkcapi | bookworm | 1.4.0-1 | vulnerable |
| Cpe | hardened_images | Not reported | Not reported | unknown |
| Cpe | openshift_container_platform | Not reported | Not reported | unknown |
| Cpe | libkcapi | Not reported | 1.5.1 | fixed |
| Cpe | enterprise_linux | Not reported | Not reported | unknown |
| Alpine | libkcapi | 3.21 | 1.5.1-r0 | fixed |
| Alpine | libkcapi | 3.22 | 1.5.1-r0 | fixed |
| Alpine | libkcapi | 3.23 | 1.5.1-r0 | fixed |
| Alpine | libkcapi | 3.24 | 1.5.1-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libkcapi | source | sid | 1.5.1-1 | not yet assigned | Not reported | [1143974] |
| Debian | libkcapi | source | forky | 1.5.1-1 | not yet assigned | Not reported | [1143974] |
| Debian | libkcapi | source | trixie | (unfixed) | not yet assigned | Not reported | [1143974] |
| Debian | libkcapi | source | bookworm | (unfixed) | not yet assigned | Not reported | [1143974] |
| Cpe | libkcapi | cpe | Not reported | 1.5.1 | Not reported | NVD-CVE-2026-71225 | Not reported |
| Alpine | libkcapi | apk | 3.21 | 1.5.1-r0 | Not reported | ALPINE-CVE-2026-71225 | Not reported |
| Alpine | libkcapi | apk | 3.22 | 1.5.1-r0 | Not reported | ALPINE-CVE-2026-71225 | Not reported |
| Alpine | libkcapi | apk | 3.23 | 1.5.1-r0 | Not reported | ALPINE-CVE-2026-71225 | Not reported |
| Alpine | libkcapi | apk | 3.24 | 1.5.1-r0 | Not reported | ALPINE-CVE-2026-71225 | Not reported |
Notes
[trixie] libkcapi: Minor issue [bookworm] libkcapi: Minor issue, revisit when fixed upstream
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [kcapi-tools]Affected
Source package: [libkcapi]
Details (2)
1.4.0-1· amd64 · bookwormAffected
nvd · libkcapi · debian · bookworm; nvd · libkcapi · debian · 12
1.4.0-1· arm64 · bookwormAffected
nvd · libkcapi · debian · bookworm; nvd · libkcapi · debian · 12
- [libkcapi1]Affected
Source package: [libkcapi]
Details (2)
1.4.0-1· amd64 · bookwormAffected
nvd · libkcapi · debian · bookworm; nvd · libkcapi · debian · 12
1.4.0-1· arm64 · bookwormAffected
nvd · libkcapi · debian · bookworm; nvd · libkcapi · debian · 12
- [libkcapi-dev]Affected
Source package: [libkcapi]
Details (2)
1.4.0-1· amd64 · bookwormAffected
nvd · libkcapi · debian · bookworm; nvd · libkcapi · debian · 12
1.4.0-1· arm64 · bookwormAffected
nvd · libkcapi · debian · bookworm; nvd · libkcapi · debian · 12
- [libkcapi-doc]Affected
Source package: [libkcapi]
Details (2)
1.4.0-1· all · bookwormAffected
nvd · libkcapi · debian · bookworm; nvd · libkcapi · debian · 12
1.4.0-1· all · bookwormAffected
nvd · libkcapi · debian · bookworm; nvd · libkcapi · debian · 12
[Debian 13 (Trixie)]
- [kcapi-tools]Affected
Source package: [libkcapi]
Details (2)
1.4.0-1+b2· amd64 · trixieAffected
nvd · libkcapi · debian · 13
1.4.0-1+b2· arm64 · trixieAffected
nvd · libkcapi · debian · 13
- [libkcapi1]Affected
Source package: [libkcapi]
Details (2)
1.4.0-1+b2· amd64 · trixieAffected
nvd · libkcapi · debian · 13
1.4.0-1+b2· arm64 · trixieAffected
nvd · libkcapi · debian · 13
- [libkcapi-dev]Affected
Source package: [libkcapi]
Details (2)
1.4.0-1+b2· amd64 · trixieAffected
nvd · libkcapi · debian · 13
1.4.0-1+b2· arm64 · trixieAffected
nvd · libkcapi · debian · 13
- [libkcapi-doc]Affected
Source package: [libkcapi]
Details (2)
1.4.0-1· all · trixieAffected
nvd · libkcapi · debian · 13
1.4.0-1· all · trixieAffected
nvd · libkcapi · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_67265.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-71225]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-71225]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-71225]
- [https://security-tracker.debian.org/tracker/CVE-2026-71225]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71225.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3322.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]