CVE-2026-25833 | mbed TLS up to 3.6.5 x509_inet_pton_ipv6 buffer overflow

VDB-354755 · CVE-2026-25833 · GCVE-0-2026-25833 MBED TLS UP TO 3.6.5 X509_INET_PTON_IPV6 BUFFER OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 1.46+ Summaryinfo A vulnerability identified as critical has been detected in mbed TLS up to 3.6.5. Impacted is the function x509_inet_pton_ipv6. The manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2026-25833. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component. Detailsinfo A vulnerability, which was classified as critical, has been found in mbed TLS up to 3.6.5. This issue affects the function x509_inet_pton_ipv6. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is: Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function It is possible to read the advisory at mbed-tls.readthedocs.io. The identification of this vulnerability is CVE-2026-25833 since 02/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 3.6.6 or 4.1.0 eliminates this vulnerability. Productinfo Name mbed TLS Version 3.6.0 3.6.1 3.6.2 3.6.3 3.6.4 3.6.5 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Buffer overflow CWE: CWE-120 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: mbed TLS 3.6.6/4.1.0 Timelineinfo 02/06/2026 CVE reserved 04/01/2026 +53 days Advisory disclosed 04/01/2026 +0 days VulDB entry created 04/01/2026 +0 days VulDB entry last update Sourcesinfo Advisory: mbed-tls.readthedocs.io Status: Confirmed CVE: CVE-2026-25833 (🔒) GCVE (CVE): GCVE-0-2026-25833 GCVE (VulDB): GCVE-100-354755 Entryinfo Created: 04/01/2026 20:55 Changes: 04/01/2026 20:55 (54) Complete: 🔍 Cache ID: 99:242:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸