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Fencer Vulns
high 7.5

CVE-2026-31790 json

Incorrect Failure Handling in RSA KEM RSASVE Encapsulation

published 2026-04-07 7 mo ago modified 2026-08-13 2 mo ago also EUVD-2026-19969 , GHSA-vgxx-5xj5-q97x , JLSEC-2026-277

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

Issue summary: Applications using RSASVE key encapsulation to establish a secret encryption key can send contents of an uninitialized memory buffer to a malicious peer.

Impact summary: The uninitialized buffer might contain sensitive data from the previous execution of the application process which leads to sensitive data leakage to an attacker.

RSA_public_encrypt() returns the number of bytes written on success and -1 on error. The affected code tests only whether the return value is non-zero. As a result, if RSA encryption fails, encapsulation can still return success to the caller, set the output lengths, and leave the caller to use the contents of the ciphertext buffer as if a valid KEM ciphertext had been produced.

If applications use EVP_PKEY_encapsulate() with RSA/RSASVE on an attacker-supplied invalid RSA public key without first validating that key, then this may cause stale or uninitialized contents of the caller-provided ciphertext buffer to be disclosed to the attacker in place of the KEM ciphertext.

As a workaround calling EVP_PKEY_public_check() or EVP_PKEY_public_check_quick() before EVP_PKEY_encapsulate() will mitigate the issue.

The FIPS modules in 3.6, 3.5, 3.4, 3.3, 3.1 and 3.0 are affected by this issue.

Patch / fix

  • julia AppBundler 1.0.1
  • julia OpenSSL_jll 3.0.20+0, 3.5.6+0
  • OpenSSL OpenSSL 3.0.20, 3.3.7, 3.4.5, 3.5.6, 3.6.2
  • Siemens SIMATIC CN 4100 V5.0
  • openssl Debian 12 3.0.19-1~deb12u2
  • openssl Debian 13 3.5.5-1~deb13u2
  • openssl Debian 14 3.6.2-1

debian advisories DEBIAN-CVE-2026-31790

  • openssl Ubuntu 22.04 LTS 3.0.2-0ubuntu1.23
  • openssl Ubuntu 24.04 LTS 3.0.13-0ubuntu3.9
  • openssl Ubuntu 25.10 3.5.3-1ubuntu3.3
  • openssl Ubuntu 26.10, Ubuntu 26.04 LTS 3.5.5-1ubuntu3
  • openssl-fips Ubuntu Pro FIPS-updates 24.04 LTS 3.0.13-0ubuntu3.12+Fips1

ubuntu advisories UBUNTU-CVE-2026-31790

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • edk2 RHEL 10.2 20251114-5.el10_2.2
  • edk2-ovmf RHEL 10.2 20251114-5.el10_2.2
  • edk2-tools RHEL 10.2 20251114-5.el10_2.2
  • edk2-aarch64 RHEL 10.2 20251114-5.el10_2.2
  • openssl-fips-provider hummingbird 1 3.0.7-1.2.hum1
  • openssl-fips-provider-so hummingbird 1 3.0.7-1.2.hum1
  • openssl-fips-provider RHEL 9 3.0.7-11.el9_8
  • openssl-fips-provider-so RHEL 9 3.0.7-11.el9_8

red hat advisories RHSA-2026:84573RHSA-2026:84572RHSA-2026:83617RHSA-2026:71542RHSA-2026:39297RHSA-2026:28832

  • openssl-3 SLE Module for Basesystem 15 SP7 3.2.3-150700.5.31.1
  • openssl-3 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.5.0-160000.7.1
  • openssl-1_0_0 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +7 more 1.0.2p-150000.3.105.1
  • openssl-1_1 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 1.1.1l-150400.7.90.1
  • openssl-3 Linux Micro 6.0 3.1.4-12.1
  • openssl-3 Linux Micro 6.1 3.1.4-slfo.1.1_9.1
  • openssl-1_1 SLE Micro 5.2 1.1.1d-150200.11.109.1
  • openssl-3 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, openSUSE Leap 15.6 3.1.4-150600.5.45.1

suse advisories SUSE-SU-2026:1375-1SUSE-SU-2026:21107-1SUSE-SU-2026:21186-1SUSE-SU-2026:1291-1SUSE-SU-2026:1257-1SUSE-SU-2026:1256-1

  • openssl-3 openSUSE Leap 16.0 3.5.0-160000.7.1
  • openssl-3 openSUSE Tumbleweed 3.5.3-4.1

opensuse advisories openSUSE-SU-2026:20525-1openSUSE-SU-2026:10533-1

  • edk2-ovmf AlmaLinux 10 20251114-5.el10_2.2
  • edk2-tools AlmaLinux 10 20251114-5.el10_2.2
  • edk2-aarch64 AlmaLinux 10 20251114-5.el10_2.2
  • openssl AlmaLinux 10 1:3.5.5-2.el10_2.alma.1
  • openssl-libs AlmaLinux 10 1:3.5.5-2.el10_2.alma.1
  • openssl-perl AlmaLinux 10 1:3.5.5-2.el10_2.alma.1
  • openssl AlmaLinux 9 1:3.5.5-2.el9_8
  • openssl-libs AlmaLinux 9 1:3.5.5-2.el9_8

almalinux advisories ALSA-2026:39297ALSA-2026:19066ALSA-2026:19218

  • edk2 Rocky Linux 10 20251114-5.el10_2.2
  • openssl Rocky Linux 10 1:3.5.5-2.el10_2
  • openssl Rocky Linux 9 1:3.5.5-2.el9_8

rocky linux advisories RLSA-2026:39297RLSA-2026:19066RLSA-2026:19218

  • openssl Alpine 3.21, Alpine 3.20 3.3.7-r0
  • openssl Alpine 3.24, Alpine 3.23, Alpine 3.22 3.5.6-r0

alpine advisories ALPINE-CVE-2026-31790

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openssl Azure Linux 3.0 3.3.5-5

azure linux advisories AZL-81950

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-31790 updated cvss 5.9

openssl: openssl: Information Disclosure from Uninitialized Memory via Invalid RSA Public Key

  • Red Hat Enterprise Linux 9 edk2, edk2-ovmf, edk2-tools, edk2-aarch64
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 openshift4/ose-hypershift-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/jetstack-cert-manager-rhel9 1791371069, cert-manager/cert-manager-operator-bundle 1791970484, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791371080
    fixed: vendor fix RHSA-2026:82888
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 cert-manager/cert-manager-operator-rhel9 1789029076, cert-manager/jetstack-cert-manager-rhel9 1791459711, cert-manager/cert-manager-istio-csr-rhel9 1791459759, cert-manager/cert-manager-operator-bundle 1791966259, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791459707
    fixed: vendor fix RHSA-2026:82354
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-trust-manager-rhel9 1790598593
    fixed: vendor fix RHSA-2026:72502
  • Red Hat Cost Management 4 costmanagement/costmanagement-metrics-rhel9-operator 1780946239, costmanagement/costmanagement-metrics-rhel9-operator 1783539156
    fixed: vendor fix RHSA-2026:39981
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1782756541, discovery/discovery-server-rhel9 1782763840
    fixed: vendor fix RHSA-2026:33313
  • Red Hat Enterprise Linux AppStream (v. 9) openssl-perl 3.5.5-2.el9_8
    fixed: vendor fix RHSA-2026:19218
show 25 more
  • Red Hat Enterprise Linux AppStream (v. 10) edk2 20251114-5.el10_2.2, openssl-perl 3.5.5-2.el10_2, edk2-ovmf 20251114-5.el10_2.2, edk2-aarch64 20251114-5.el10_2.2
    fixed: vendor fix RHSA-2026:39297
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) openssl-debuginfo 3.0.7-18.el9_2.4, openssl-debugsource 3.0.7-18.el9_2.4
    fixed: vendor fix RHSA-2026:84572
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) openssl-debuginfo 3.0.7-29.el9_4.3, openssl-debugsource 3.0.7-29.el9_4.3, openssl-libs-debuginfo 3.0.7-29.el9_4.3
    fixed: vendor fix RHSA-2026:84573
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) openssl-perl 3.2.2-16.el10_0.7
    fixed: vendor fix RHSA-2026:71542
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) openssl-perl 3.2.2-7.el9_6.4
    fixed: vendor fix RHSA-2026:83617
  • Red Hat Enterprise Linux BaseOS (v. 9) openssl 3.5.5-2.el9_8, openssl-libs 3.5.5-2.el9_8, openssl-fips-provider 3.0.7-11.el9_8, openssl-fips-provider-so 3.0.7-11.el9_8
    fixed: vendor fix RHSA-2026:19218
  • Red Hat Enterprise Linux BaseOS (v. 10) openssl 3.5.5-2.el10_2, openssl-libs 3.5.5-2.el10_2, openssl-fips-provider 3.0.7-11.el10_2, openssl-fips-provider-so 3.0.7-11.el10_2
    fixed: vendor fix RHSA-2026:19066
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) openssl 3.0.7-18.el9_2.4, openssl-libs 3.0.7-18.el9_2.4, openssl-fips-provider 3.0.7-11.el9_0, openssl-fips-provider-so 3.0.7-11.el9_0
    fixed: vendor fix RHSA-2026:84572
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) openssl 3.0.7-29.el9_4.3, openssl-libs 3.0.7-29.el9_4.3, openssl-fips-provider 3.0.7-11.el9_0, openssl-fips-provider-so 3.0.7-11.el9_0
    fixed: vendor fix RHSA-2026:84573
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) openssl 3.2.2-16.el10_0.7, openssl-libs 3.2.2-16.el10_0.7, openssl-fips-provider 3.0.7-11.el10_0, openssl-fips-provider-so 3.0.7-11.el10_0
    fixed: vendor fix RHSA-2026:71542
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) openssl 3.2.2-7.el9_6.4, openssl-libs 3.2.2-7.el9_6.4, openssl-fips-provider 3.0.7-11.el9_0, openssl-fips-provider-so 3.0.7-11.el9_0
    fixed: vendor fix RHSA-2026:83617
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) edk2-ovmf 20251114-5.el10_2.2, edk2-tools 20251114-5.el10_2.2, edk2-aarch64 20251114-5.el10_2.2
    fixed: vendor fix RHSA-2026:39297
  • Red Hat Hardened Images openssl 3.5.6-0.1.hum1, openssl-libs 3.5.6-0.1.hum1, openssl-perl 3.5.6-0.1.hum1, openssl-config-fips 3.5.6-0.1.hum1, openssl-devel-engine 3.5.6-0.1.hum1, openssl-fips-provider 3.0.7-1.2.hum1, +1 more
    fixed: vendor fix RHSA-2026:7261
  • Red Hat Insights proxy 1.5 insights-proxy/insights-proxy-container-rhel9 1780420428, insights-proxy/insights-proxy-container-rhel9 1782890503
    fixed: vendor fix RHSA-2026:22634
  • Red Hat JBoss Core Services 2.4.62.SP4
    fixed: vendor fix RHSA-2026:27201
  • Red Hat JBoss Web Server 6.2.2
    fixed: vendor fix RHSA-2026:12195
  • Red Hat OpenShift AI 3.0 rhai/base-image-cpu-rhel9 1793042072, rhai/base-image-cpu-rhel9 1793329709, rhai/base-image-tpu-rhel9 1793041987, rhai/base-image-cuda-rhel9 1793042067, rhai/base-image-cuda-rhel9 1793328358, rhai/base-image-rocm-rhel9 1793041981, +1 more
    fixed: vendor fix RHSA-2026:94459
  • Red Hat OpenShift AI 3.4 rhai/base-image-cpu-rhel9 1793042088, rhai/base-image-tpu-rhel9 1793042006, rhai/base-image-gaudi-rhel9 1793042011, rhai/base-image-spyre-rhel9 1793042074, rhai/base-image-neuron-rhel9 1790703542, rhai/base-image-neuron-rhel9 1793042008, +5 more
    fixed: vendor fix RHSA-2026:91241
  • Red Hat OpenShift AI 3.5 rhai/base-image-cpu-rhel9 1793042162, rhai/base-image-tpu-rhel9 1793042010, rhai/base-image-gaudi-rhel9 1793042004, rhai/base-image-rubin-rhel9 1793042092, rhai/base-image-spyre-rhel9 1793042114, rhai/base-image-neuron-rhel9 1793042008, +4 more
    fixed: vendor fix RHSA-2026:91204
  • Red Hat OpenShift Container Platform 4.13 rhcos 413.92.202608111330
    fixed: vendor fix RHSA-2026:54187
  • Red Hat OpenShift Container Platform 4.14 rhcos 414.92.202607210313
    fixed: vendor fix RHSA-2026:43252
  • Red Hat OpenShift Container Platform 4.15 rhcos 415.92.202607210244
    fixed: vendor fix RHSA-2026:43226
  • Red Hat OpenShift Container Platform 4.19 rhcos 4.19.9.6.202607220857
    fixed: vendor fix RHSA-2026:44231
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1779798159, rhui5/cds-rhel9 1784794778, rhui5/rhua-rhel9 1779798222, rhui5/rhua-rhel9 1784795076, rhui5/haproxy-rhel9 1779798164, rhui5/haproxy-rhel9 1784795112, +6 more
    fixed: vendor fix RHSA-2026:44481
  • Red Hat Cost Management 4 costmanagement/costmanagement-metrics-operator-bundle 1780989656, costmanagement/costmanagement-metrics-operator-bundle 1783613222 Red Hat Enterprise Linux 6 openssl, openssl-perl Red Hat Enterprise Linux 7 ovmf, OVMF, AAVMF, openssl, openssl-libs, openssl-perl Red Hat Enterprise Linux 8 edk2, shim, openssl, shim-x64, edk2-ovmf, shim-aa64, +9 more Red Hat Enterprise Linux 9 shim, shim-x64, shim-aa64, compat-openssl11, shim-unsigned-x64, shim-unsigned-aarch64 Red Hat Enterprise Linux 10 shim, shim-unsigned-x64, shim-unsigned-aarch64
    +2 more products
    Red Hat Enterprise Linux AppStream E4S (v.9.2) openssl-perl 3.0.7-18.el9_2.4 Red Hat Enterprise Linux AppStream E4S (v.9.4) openssl-perl 3.0.7-29.el9_4.3
    not affected: vulnerable code not present

7 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

1.05% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
julia AppBundler
>=1.0.0, <1.0.1
1.0.1
julia OpenSSL_jll
>=3.0.8+0, <3.0.20+0
>=3.5.0+0, <3.5.6+0
3.0.20+0
3.5.6+0
julia Openresty_jll
>=1.27.1+0
 no fix listed

Affected products

  • OpenSSL OpenSSL
  • Siemens SIMATIC CN 4100

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.