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Vulnerabilities

Security incident · CVE-2026-75805

Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted rev

Published Sep 29, 2026 · catalog updated Oct 26, 2026 · Issue summary: A CMP

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-75805. EPSS is 0.32%. Act only if a listed version of Issue summary: A CMP is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Issue summary: A CMP).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.32%
Remediation
Advisory link
Affected products
Debian:12 openssl · Debian:13 openssl · Debian:14 openssl

Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr ' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a certificate or by issuer and serial number rather than by a PKCS#10 CSR are not affected. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 openssl0 → 3.0.22-1~deb12u2
  • Debian:13 openssl0 → 3.5.7-1~deb13u3
  • Debian:14 openssl0 → 3.6.5-1

How to fix CVE-2026-75805

  • Upgrade

    CVE-2026-75805 lists a fix boundary at 3.0.22-1~deb12u2. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 3.0.22-1~deb12u2 · 2 other ranges on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-75805. EPSS is 0.32%. Act only if a listed version of Issue summary: A CMP is installed.

Which versions are affected?

Compare what you have installed with 0 → 3.0.22-1~deb12u2, 0 → 3.5.7-1~deb13u3, 0 → 3.6.5-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.32%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 29, 2026 · Trivy Vulnerability DB

    Detected

    Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A C

  2. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.0.22-1~deb12u2; openssl fixed in 3.5.7-1~deb13u3; openssl fixed in 3.6.5-1

  3. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.0.22-1~deb12u2

  4. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.5.7-1~deb13u3

  5. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    openssl fixed in 3.6.5-1

  6. Oct 26, 2026 · Trivy Vulnerability DB

    Updated

    Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A C

Sources

  • CVE.orgVulnerability recordCVE-2026-75805

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-75805

    Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a cr

    osv.dev

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 26, 2026
  • Trivy Vulnerability DBOct 26, 2026