# Rustls vulnerabilities Source: https://junglewise.ai/threats/vendors/rustls Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/vendors/rustls.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 9 vulnerabilities in Rustls: 2 in the last 7 days and 9 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-123613, was published on 8 November 2026. 4 vulnerabilities in the last four weeks, down 20% on the four before (5). 2 technologies have a page of their own. ## Counts - Last 7 days: 2 - Last 30 days: 4 - Last 90 days: 9 - All time: 9 (0 critical, 0 exploited in the wild) ## Latest Rustls vulnerabilities - [CVE-2026-123613: Rustls TLS 1.3 handshake message encryption level bypass](https://junglewise.ai/threats/cve-2026-123613-rustls-from-0-23-13-before-0-23-45-accepts-tls-1-3-handshake) (medium, CVSS 5.3, published 8 Nov 2026) - [CVE-2026-123609: Rustls session Debug formatting exposes TLS secret keys](https://junglewise.ai/threats/cve-2026-123609-rustls-before-0-23-46-and-0-24-0-dev-1-before-0-24-0-dev-2) (medium, CVSS 4, published 8 Nov 2026) - [Rustls client session debug formatting information disclosure](https://junglewise.ai/threats/rustls-session-debug-formatting-exposes-tls-master-secrets-and-6519d2da) (medium, CVSS 4, published 27 Oct 2026) - [rustls-ffi use-after-free in client connection constructors](https://junglewise.ai/threats/rustsec-2026-0413-use-after-free-of-caller-owned-server-name-in-client-1086601a) (info, published 26 Oct 2026) - [Rustls TLS 1.3 handshake message validation bypass across encryption levels](https://junglewise.ai/threats/rustls-tls-1-3-handshake-messages-incorrectly-accepted-across-4eccbdca) (medium, CVSS 5.3, published 5 Oct 2026) - [CVE-2026-93602: rustls-webpki CRL distribution point matching bypass](https://junglewise.ai/threats/cve-2026-93602-rustls-webpki-crl-distribution-point-matching-bypass) (medium, CVSS 4.4, published 18 Sep 2026) - [CVE-2026-93601: rustls-webpki name constraint bypass for wildcard certificates](https://junglewise.ai/threats/cve-2026-93601-rustls-webpki-name-constraint-bypass-for-wildcard-certificates) (low, CVSS 3.1, published 18 Sep 2026) - [CVE-2026-93600: rustls-webpki X.509 name constraint bypass for URI names](https://junglewise.ai/threats/cve-2026-93600-rustls-webpki-x-509-name-constraint-bypass-for-uri-names) (low, CVSS 3.1, published 18 Sep 2026) - [CVE-2026-93599: rustls-webpki integer underflow in BIT STRING parsing](https://junglewise.ai/threats/cve-2026-93599-rustls-webpki-integer-underflow-in-bit-string-parsing) (high, CVSS 7.5, published 18 Sep 2026) ## Most severe Rustls vulnerabilities - [CVE-2026-93599: rustls-webpki integer underflow in BIT STRING parsing](https://junglewise.ai/threats/cve-2026-93599-rustls-webpki-integer-underflow-in-bit-string-parsing) (high, CVSS 7.5, published 18 Sep 2026) - [CVE-2026-123613: Rustls TLS 1.3 handshake message encryption level bypass](https://junglewise.ai/threats/cve-2026-123613-rustls-from-0-23-13-before-0-23-45-accepts-tls-1-3-handshake) (medium, CVSS 5.3, published 8 Nov 2026) - [Rustls TLS 1.3 handshake message validation bypass across encryption levels](https://junglewise.ai/threats/rustls-tls-1-3-handshake-messages-incorrectly-accepted-across-4eccbdca) (medium, CVSS 5.3, published 5 Oct 2026) - [CVE-2026-93602: rustls-webpki CRL distribution point matching bypass](https://junglewise.ai/threats/cve-2026-93602-rustls-webpki-crl-distribution-point-matching-bypass) (medium, CVSS 4.4, published 18 Sep 2026) - [CVE-2026-123609: Rustls session Debug formatting exposes TLS secret keys](https://junglewise.ai/threats/cve-2026-123609-rustls-before-0-23-46-and-0-24-0-dev-1-before-0-24-0-dev-2) (medium, CVSS 4, published 8 Nov 2026) - [Rustls client session debug formatting information disclosure](https://junglewise.ai/threats/rustls-session-debug-formatting-exposes-tls-master-secrets-and-6519d2da) (medium, CVSS 4, published 27 Oct 2026) - [CVE-2026-93601: rustls-webpki name constraint bypass for wildcard certificates](https://junglewise.ai/threats/cve-2026-93601-rustls-webpki-name-constraint-bypass-for-wildcard-certificates) (low, CVSS 3.1, published 18 Sep 2026) - [CVE-2026-93600: rustls-webpki X.509 name constraint bypass for URI names](https://junglewise.ai/threats/cve-2026-93600-rustls-webpki-x-509-name-constraint-bypass-for-uri-names) (low, CVSS 3.1, published 18 Sep 2026) - [rustls-ffi use-after-free in client connection constructors](https://junglewise.ai/threats/rustsec-2026-0413-use-after-free-of-caller-owned-server-name-in-client-1086601a) (info, published 26 Oct 2026) ## Vulnerabilities per week 4 vulnerabilities in the last four weeks, down 20% on the four before (5). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 4 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 1 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 2 | 0 | 0 | | 2 Nov 2026 | 2 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Rustls technologies - [Rustls](https://junglewise.ai/threats/technologies/rustls-rustls): 4 vulnerabilities - [Rustls Webpki](https://junglewise.ai/threats/technologies/webpki): 4 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Rustls vulnerabilities", https://junglewise.ai/threats/vendors/rustls, 9 November 2026.