Allocation of Resources Without Limits or Throttling Affecting openssl package, versions [3.0.5,3.1.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published26 Aug 2026
- disclosed25 Aug 2026
- creditPavоl Žáčik (Red Hat)
Introduced: 25 Aug 2026
NewCVE-2026-63074 (opens in a new tab)How to fix?
Upgrade openssl to version 3.1.0 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through ossl_cmp_msg_check_update in crypto/cmp/cmp_vfy.c. An attacker can drive unbounded memory growth by repeatedly sending CMP messages with unique extraCerts that are rejected during message validation. When OSSL_CMP_CTX is reused for a long-lived CMP server, the rejected message’s extra certificates remain cached in ctx->untrusted, so the server keeps accumulating certificate objects indefinitely. This can exhaust memory and cause OOM conditions, disrupting CMP service for legitimate clients.