CVE-2026-93601 rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass

rustls-webpki the Rust webpki fork used by rustls versions = 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a...

CVE-2026-93599

rustls-webpki through 0.103.12 and 0.104.0-alpha releases before 0.104.0-alpha.7 contains a reachable panic in bitstringflags in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose content is exactly 0x00 zero padding bits and no data bytes, so rawbits.len - 1 underflows on t...

CVE-2026-93600 rustls webpki Name Constraints URI Validation Bypass

rustls-webpki rustls/webpki versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issu...

CVE-2026-93600 rustls webpki Name Constraints URI Validation Bypass

rustls-webpki rustls/webpki versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issu...

CVE-2026-93599 rustls-webpki before 0.103.13 Panic via empty BIT STRING

rustls-webpki through 0.103.12 and 0.104.0-alpha releases before 0.104.0-alpha.7 contains a reachable panic in bitstringflags in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose content is exactly 0x00 zero padding bits and no data bytes, so rawbits.len - 1 underflows on t...

CVE-2026-93600 rustls webpki Name Constraints URI Validation Bypass

rustls-webpki rustls/webpki versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issu...

CVE-2026-93600

rustls-webpki (the X.509 certificate verification library in the Rust rustls ecosystem) versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names , meaning such constraints are accepted but not enforced. The flaw is o...

EUVD-2026-82895

rustls-webpki rustls/webpki versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issu...

CVE-2026-93599

rustls-webpki (Rust TLS cryptography library) versions through 0.103.12 and 0.104.0-alpha.6 are affected by a panic in bit_string_flags() in src/der.rs. The root cause is that the input guard fails to reject a named-bit BIT STRING whose content is exactly [0x00] (zero padding bits, no data bytes)...

CVE-2026-93599 rustls-webpki before 0.103.13 Panic via empty BIT STRING

rustls-webpki through 0.103.12 and 0.104.0-alpha releases before 0.104.0-alpha.7 contains a reachable panic in bitstringflags in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose content is exactly 0x00 zero padding bits and no data bytes, so rawbits.len - 1 underflows on t...

EUVD-2026-82894

rustls-webpki through 0.103.12 and 0.104.0-alpha releases before 0.104.0-alpha.7 contains a reachable panic in bitstringflags in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose content is exactly 0x00 zero padding bits and no data bytes, so rawbits.len - 1 underflows on t...

CVE-2026-93600

rustls-webpki rustls/webpki versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issu...

CVE-2026-93599 rustls-webpki before 0.103.13 Panic via empty BIT STRING

rustls-webpki through 0.103.12 and 0.104.0-alpha releases before 0.104.0-alpha.7 contains a reachable panic in bitstringflags in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose content is exactly 0x00 zero padding bits and no data bytes, so rawbits.len - 1 underflows on t...

CVE-2026-93599: Integer Underflow (Wrap or Wraparound)

rustls-webpki through 0.103.12 and 0.104.0-alpha releases before 0.104.0-alpha.7 contains a reachable panic in bitstringflags in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose content is exactly 0x00 zero padding bits and no data bytes, so rawbits.len - 1 underflows on t...

PT-2026-99974

rustls-webpki the Rust webpki fork used by rustls versions = 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a...

PT-2026-99968

rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can...

CVE-2026-93600: Improper Certificate Validation

rustls-webpki rustls/webpki versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issu...

PT-2026-99983

rustls-webpki rustls/webpki versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issu...

CVE-2026-93602: Improper Check for Certificate Revocation

rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can...

CVE-2026-93601: Improper Certificate Validation

rustls-webpki the Rust webpki fork used by rustls versions = 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a...