[UPDATE] [high] GnuTLS: Multiple vulnerabilities
An attacker can exploit multiple vulnerabilities in GnuTLS to bypass security measures, disclose confidential information, cause a denial-of-service condition, or perform other unspecified attacks.
CSIRTS triage
- What
- Multiple vulnerabilities can bypass security measures, disclose confidential information, or cause denial of service.
- Who is affected
- Users of GnuTLS in their applications.
- Urgency
- Remediation is urgent due to the high severity of the vulnerabilities.
- Action
- Update to the latest version of GnuTLS.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1312
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-338450.80% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all EPSS-scored CVEs.
- Moderate exploitation riskCVE-2026-338461.3% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 67% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-38320.72% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-38330.56% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 44% of all EPSS-scored CVEs.
- Moderate exploitation riskCVE-2026-420091.3% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 69% of all EPSS-scored CVEs.
- Moderate exploitation riskCVE-2026-420101.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-420110.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-420120.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-420130.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-420140.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-33845 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-33846 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-3832 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-3833 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42009 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42010 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42011 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42012 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42013 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42014 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42015 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-5260 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-5419 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- mediumCVE-2026-3833: Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparisonmsrc
- lowCVE-2026-3832: Gnutls: gnutls: security bypass allows acceptance of revoked server certificates via crafted oc…msrc
- unknownMultiple vulnerabilities in IBM products (July 31, 2026)cert-fr-avis
- unknownUSN-8539-1: GnuTLS vulnerabilitiesubuntu
- unknownUSN-8502-1: GnuTLS vulnerabilitiesubuntu
- lowCVE-2026-5419: Guntls: gnutls: information disclosure via timing side-channel in pkcs#7 padding removalmsrc
- mediumCVE-2026-42014: Gnutls: fix use-after-free in gnutls_pkcs11_token_set_pinmsrc
Recent advisories for GnuTLS
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- lowCVE-2026-3832: Gnutls: gnutls: security bypass allows acceptance of revoked server certificates via crafted oc…msrc · 2026-08-06
- mediumCVE-2026-3833: Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparisonmsrc · 2026-08-06
- medium[UPDATE] [medium] GnuTLS: Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-07-22
- low[UPDATE] [low] GnuTLS: Vulnerability allows unspecified attackcert-bund · 2026-07-21
- unknownUSN-8539-1: GnuTLS vulnerabilitiesubuntu · 2026-07-14
- medium[UPDATE] [medium] GnuTLS: Vulnerability allows denial of servicecert-bund · 2026-07-07
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