CVE catalog
CVE-2026-84971
Improper handling of an unexpected value size in the decryption path of a client-side encryption library can cause a failed internal check that terminates the process using the library. A party able t
- Severity
- High · CVSS 7.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.26% · Oct 25, 2026
Improper handling of an unexpected value size in the decryption path of a client-side encryption library can cause a failed internal check that terminates the process using the library. A party able to place a suitably formed encrypted value where an application will decrypt it, or able to control the responses the application receives, may cause that application to stop running.
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 | libmongocrypt | sid | 1.21.1-1 | fixed |
| Debian | libmongocrypt | forky | 1.21.0-1 | fixed |
| Debian | libmongocrypt | trixie | 1.13.2-1+deb13u1 | vulnerable |
| Debian | libmongocrypt | bookworm | 1.7.2-1 | vulnerable |
| Cpe | libmongocrypt | Not reported | 1.20.4 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libmongocrypt | source | sid | 1.20.4-1 | not yet assigned | Not reported | Not reported |
| Debian | libmongocrypt | source | forky | 1.20.4-1 | not yet assigned | Not reported | Not reported |
| Debian | libmongocrypt | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | libmongocrypt | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Cpe | libmongocrypt | cpe | Not reported | 1.20.4 | Not reported | NVD-CVE-2026-84971 | Not reported |
Notes
[trixie] libmongocrypt: Minor issue [bookworm] libmongocrypt: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libmongocrypt0]Affected
Source package: [libmongocrypt]
Details (2)
1.7.2-1· amd64 · bookwormAffected
nvd · libmongocrypt · debian · bookworm; nvd · libmongocrypt · debian · 12
1.7.2-1· arm64 · bookwormAffected
nvd · libmongocrypt · debian · bookworm; nvd · libmongocrypt · debian · 12
- [libmongocrypt-dev]Affected
Source package: [libmongocrypt]
Details (2)
1.7.2-1· amd64 · bookwormAffected
nvd · libmongocrypt · debian · bookworm; nvd · libmongocrypt · debian · 12
1.7.2-1· arm64 · bookwormAffected
nvd · libmongocrypt · debian · bookworm; nvd · libmongocrypt · debian · 12
[Debian 13 (Trixie)]
- [libmongocrypt0]Affected
Source package: [libmongocrypt]
Details (2)
1.13.2-1· amd64 · trixieAffected
nvd · libmongocrypt · debian · 13
1.13.2-1· arm64 · trixieAffected
nvd · libmongocrypt · debian · 13
- [libmongocrypt-dev]Affected
Source package: [libmongocrypt]
Details (2)
1.13.2-1· amd64 · trixieAffected
nvd · libmongocrypt · debian · 13
1.13.2-1· arm64 · trixieAffected
nvd · libmongocrypt · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-84971]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-84971]
- [https://security-tracker.debian.org/tracker/CVE-2026-84971]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84971.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3182.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]