CVE-2026-42766

Aliases:DEBIAN-CVE-2026-42766UBUNTU-CVE-2026-42766ALPINE-CVE-2026-42766CGA-9fv6-c4c7-7xwrCGA-9mqf-xpvc-p77xCGA-gf26-66cr-92gvCGA-3v77-gvxm-rqrhCGA-832c-98m3-g2xmCGA-fw3p-xf8f-2wq3CGA-fw8m-h785-fv4rCGA-jfxr-48jh-gh59CGA-m59w-36w5-93pwCGA-prgf-f8h6-p2x6CGA-pv8c-f2q9-fq5vCGA-vhmq-94gr-cwwvCGA-x3m4-6wff-rvw2CGA-x9j4-77f9-qvfv
Advisory lineage Upstream: 0 Downstream: 25
Analyzed
Published: 09 Jun 2026, 16:03
Last modified:10 Jun 2026, 07:48

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
v3.1 (cve.org)
EPSS Score
1.06% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

09 Jun 2026, 16:03
Published
Vulnerability first disclosed
10 Jun 2026, 07:48
Last Modified
Vulnerability information updated

Description

Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption. Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service. The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present. An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service. Applications that process password-encrypted CMS messages may be affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 1.06%• Percentile: 63%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • alpine•openssl

    ≥ 1.0.2, < 3.3.7-r1 | ≥ 1.0.2, < 3.5.7-r0 | ≥ 1.0.2, < 3.5.7-r0 | ≥ 1.0.2, < 3.5.7-r0

  • chainguard•libcrypto3

    < 3.6.3-r0

  • chainguard•libcrypto3-2.34

    < 3.6.3-r0

  • chainguard•openssl

    < 3.6.3-r0

  • chainguard•openssl-provider-fips-3.4.0

    < 0

  • chainguard•openssl-provider-fips-3.4.0-dbg

    < 0

  • chainguard•openssl-provider-fips-3.6.0

    < 0

  • chainguard•openssl-provider-fips-3.6.0-dbg

    < 0

  • wolfi•libcrypto3

    < 3.6.3-r0

  • wolfi•openssl

    < 3.6.3-r0

  • debian•openssl

    < 1.1.1w-0+deb11u8 | < 3.0.20-1~deb12u2 | < 3.5.6-1~deb13u2 | < 3.6.3-1

  • ubuntu•edk2

    all | all | all | all | all | all

  • ubuntu•edk2-hwe

    all

  • ubuntu•nodejs

    all

  • ubuntu•openssl

    < 1.0.1f-1ubuntu2.27+esm14 | < 1.0.2g-1ubuntu4.20+esm16 | all | < 1.1.1-1ubuntu2.1~18.04.23+esm9 | < 1.1.1-1ubuntu2.fips.2.1~18.04.23.9 | < 1.1.1f-1ubuntu2.24+esm4 | < 1.1.1f-1ubuntu2.fips.24.4 | < 3.0.2-0ubuntu1.25 | < 3.0.2-0ubuntu1.25+Fips1 | < 3.0.13-0ubuntu3.11 | < 3.5.3-1ubuntu3.4 | < 3.5.5-1ubuntu3.2

  • ubuntu•openssl-fips

    all | < 3.0.13-0ubuntu3.12+Fips1

  • ubuntu•openssl1.0

    < 1.0.2n-1ubuntu5.13+esm5

  • openssl•openssl

    ≥ 4.0.0, < 4.0.1 | ≥ 1.0.2, < 1.0.2zq | ≥ 1.1.1, < 1.1.1zh | ≥ 3.0.0, < 3.0.21 | ≥ 3.4.0, < 3.4.6 | ≥ 3.5.0, < 3.5.7 | ≥ 3.6.0, < 3.6.3 | 4.0.0

References (19)