Red Hat Security Advisory: RHTAS 1.3.7 - Red Hat Trusted Artifact Signer Release
Affects Red HatSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 11:52 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
AI-suggested
To mitigate the risk, avoid calling prettyPrint(), str(), float(), int(), or performing comparisons or arithmetic on decoded ASN.1 REAL type objects when processing untrusted data. Instead, inspect the raw (mantissa, base, exponent) tuple directly. When logging decoded ASN.1 structures, filter out or sanitize REAL-typed values before conversion to prevent resource exhaustion.
Description
CVE-2026-59886 is a denial of service vulnerability in the pyasn1 library used by Red Hat products processing ASN.1 data. A remote attacker can send specially crafted BER, CER, or DER encoded ASN.1 REAL values with large exponents, causing excessive CPU and memory consumption during decoding operations such as printing, logging, or arithmetic. This resource exhaustion can render the affected service unavailable. The vulnerability affects Red Hat Trusted Artifact Signer used with OpenShift Container Platform versions 4.16 through 4.21. No fix is currently available, and mitigation involves avoiding certain operations on decoded REAL values and sanitizing logs.
References
- access.redhat.com/errata/RHSA-2026:59426 (opens in a new tab)
- access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.3 (opens in a new tab)
- access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.3/html-single/release_notes/index (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-59886 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_59426.json (opens in a new tab)