CVE-2026-63074

Aliases:DEBIAN-CVE-2026-63074UBUNTU-CVE-2026-63074ALPINE-CVE-2026-63074CGA-3cw6-4jq5-4g9wCGA-62hg-h4px-f3r3CGA-8p9f-qx47-q85hCGA-9rrg-w8gf-56fpCGA-9w8g-vfq2-fq75CGA-cvm5-fjrh-4vqcCGA-f8hf-cg9p-mwwfCGA-gwxg-g7wc-mm27CGA-j8v9-h49h-crxhCGA-m4cr-jwgw-63mwCGA-m892-84j4-7h2qCGA-mv6p-rww4-r6q3CGA-rf69-74qh-mm8pCGA-wrm2-h9cg-f8g3
Advisory lineage Upstream: 0 Downstream: 15
Analyzed
Published: 25 Aug 2026, 12:59
Last modified:25 Aug 2026, 14:36

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
v3.1 (cve.org)
EPSS Score
0.5% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Aug 2026, 12:59
Published
Vulnerability first disclosed
25 Aug 2026, 14:36
Last Modified
Vulnerability information updated

Description

Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches additional certificates (extraCerts) sent in a CMP message, but never expunges them (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX frequently, this cache of extraCerts may grow unboundedly, and a malicious client may flood a CMP server with requests driving this growth. Impact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX for the lifetime of a server process may observe unbounded memory growth in the event a malicious client repeatedly sends requests containing unique extra certificates, which may lead to OOM conditions. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: If a remote user sends CMP messages to a server with a list of extraCerts and the message is rejected, the extraCerts from the message remains in the server contexts untrusted certificate stack. This exposes servers with long lived ctx objects to Denial of Service attacks in which an attacker sends messages intending to be rejected with a large list of additional certificates repeatedly, forcing the server to store them indefinitely. The issue was fixed by removing the added extra certs if the message is rejected, using the same method as when the context is configured to not do caching at all. FIPS impact: no As the CMP code lives outside the FIPS module boundary, no FIPS modules are affected by this CVE.

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: 0.50%• Percentile: 42%

Techniques & Countermeasures

  • CWE-770•Allocation of Resources Without Limits or Throttling

    The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

  • alpine•openssl

    < 3.5.8-r0 | < 3.5.8-r0 | < 3.5.8-r0 | ≥ 3.0.0, < 3.5.8-r0 | ≥ 3.0.0, < 3.5.8-r0 | ≥ 3.0.0, < 3.5.8-r0

  • chainguard•eco-python-openssl-4

    all | < 4.0.2-r0

  • chainguard•eco-python-openssl-4-pyca

    all | < 4.0.2-r0

  • chainguard•eco-python-openssl-4-pyca-dev

    all | < 4.0.2-r0

  • chainguard•openssl-provider-fips-3.4.0

    all

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

    all

  • chainguard•openssl-provider-fips-3.6.0

    all

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

    all | < 0

  • debian•openssl

    all | all | all | < 3.5.7-1~deb13u2 | < 3.6.4-1

  • ubuntu•edk2

    all | all

  • ubuntu•edk2-hwe

    all

  • ubuntu•nodejs

    all

  • ubuntu•openssl

    < 3.0.2-0ubuntu1.29 | all | < 3.0.2-0ubuntu1.29+Fips1 | < 3.0.13-0ubuntu3.15 | < 3.5.5-1ubuntu3.4

  • ubuntu•openssl-fips

    all | < 3.0.13-0ubuntu3.15+Fips1

  • openssl•openssl

    ≥ 3.0.0, < 3.0.22 | ≥ 3.4.0, < 3.4.7 | ≥ 3.5.0, < 3.5.8 | ≥ 3.6.0, < 3.6.4 | ≥ 4.0.0, < 4.0.2

References (14)