CVE-2026-42767: NULL Pointer Dereference in CRMF EncryptedValue Decryption
Vulnerability summary
CVE-2026-42767 is a medium (CVSS 5.9) NULL Pointer Dereference vulnerability in openssl. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 46.4% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 18 · Related 9Timeline
- 09-06-2026PublishedVulnerability first disclosed.
- 10-06-2026Last modifiedVulnerability information updated.
Description
Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application. Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service. An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client. Applications that process untrusted CMP/CRMF 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
7 scores · 7 sources · 1 version- OSV · AlpineEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.56%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
Increase +0.13 pp
From 0.43% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard14 products
- libcrypto3< 3.6.3-r0
- libcrypto3-2.34< 3.6.3-r0
- openssl< 3.6.3-r0
- openssl-3.5< 3.5.7-r0
- openssl-3.5-libcrypto< 3.5.7-r0
Ubuntu5 products
- edk2All versions (No fix recorded)
- edk2-hweAll versions (No fix recorded)
- nodejsAll versions (No fix recorded)
- openssl< 3.0.2-0ubuntu1.25 | All versions (No fix recorded) | < 3.0.2-0ubuntu1.25+Fips1 | < 3.0.13-0ubuntu3.11 | < 3.5.3-1ubuntu3.4 | < 3.5.5-1ubuntu3.2
- openssl-fipsAll versions (No fix recorded) | < 3.0.13-0ubuntu3.12+Fips1
Wolfi5 products
- libcrypto3< 3.6.3-r0
- openssl< 3.6.3-r0
- openssl-4.0< 4.0.1-r0
- openssl-4.0-libcrypto< 4.0.1-r0
- openssl-4.0-libssl< 4.0.1-r0
Suse4 products
- openssl-3&distro=SUSE Linux Enterprise Server 15 SP6-LTSS< 3.1.4-150600.5.56.1
- openssl-3&distro=SUSE Linux Enterprise Server for SAP Applications 15 SP6< 3.1.4-150600.5.56.1
- openssl-3&distro=SUSE Linux Micro 6.0< 3.1.4-15.1
- openssl-3&distro=SUSE Linux Micro 6.1< 3.1.4-slfo.1.1_11.1
Alpine1 product
- openssl≥ 3.0.0, < 3.5.7-r0
Debian1 product
- openssl< 3.0.22-1~deb12u1 | < 3.5.6-1~deb13u2 | < 3.6.3-1
Openssl1 product
- openssl≥ 4.0.0, < 4.0.1 | ≥ 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
7 vendors · 31 products
