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6 vulnerabilities found for picotls by h2o
CVE-2026-59993 (GCVE-0-2026-59993)
Vulnerability from nvd – Published: 2026-10-30 21:01 – Updated: 2026-10-30 21:01
VLAI
EPSS
VEX
Title
Picotls has NULL pointer dereference during handshake, when running as a client
Summary
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. In affected revisions through 44bc503, when picotls is used as a `client-side TLS stack`, a peer can send a `HelloRetryRequest` followed by a `spoofed Hello message` that causes a null-pointer dereference. This can terminate the consuming process, including a process performing other work, resulting in denial of service. This issue is fixed in commit a06ca41.
Severity
6.5 (Medium)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h2o/picotls/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/h2o/picotls/pull/608 | x_refsource_MISC |
| https://github.com/h2o/picotls/commit/a06ca417a16… | x_refsource_MISC |
Impacted products
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}
],
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},
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CVE-2026-45271 (GCVE-0-2026-45271)
Vulnerability from nvd – Published: 2026-08-21 21:00 – Updated: 2026-08-25 14:18
VLAI
EPSS
VEX
Title
picotls has infinite recursion in the minicrypto ASN.1 decoder
Summary
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. Picotls implements its own ASN.1 validation helper, which is used by the minicrypto backend while parsing local PKCS#8 private keys. Prior to commit c14231d801407640bc42c2dcf92783409ea6a7c7, the validator recursively descends into constructed ASN.1 elements without enforcing a maximum nesting depth. If an application loads an attacker-supplied private-key file through ptls_minicrypto_load_private_key(), or otherwise calls the public ASN.1 validation API on untrusted DER, a crafted deeply nested ASN.1 structure can exhaust the process stack and crash the application. Note that the libcrypto (OpenSSL) backend does not use the ASN.1 validation helper of picotls, and therefore is immune to this vulnerability. The vulnerability has been addressed in commit c14231d801407640bc42c2dcf92783409ea6a7c7.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 14:18 UTC
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/picotls/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/h2o/picotls/commit/c14231d8014… | x_refsource_MISC |
Impacted products
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}
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CVE-2024-45402 (GCVE-0-2024-45402)
Vulnerability from nvd – Published: 2024-10-11 14:38 – Updated: 2024-10-15 16:11
VLAI
EPSS
VEX
Title
Picotls double free
Summary
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. When parsing a spoofed TLS handshake message, picotls (specifically, bindings within picotls that call the crypto libraries) may attempt to free the same memory twice. This double free occurs during the disposal of multiple objects without any intervening calls to malloc Typically, this triggers the malloc implementation to detect the error and abort the process. However, depending on the internals of malloc and the crypto backend being used, the flaw could potentially lead to a use-after-free scenario, which might allow for arbitrary code execution. The vulnerability is addressed with commit 9b88159ce763d680e4a13b6e8f3171ae923a535d.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:51 UTC
CWE
- CWE-415 - Double Free
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/picotls/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/h2o/picotls/commit/9b88159ce76… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| h2o | picotls |
Affected:
< 9b88159ce763d680e4a13b6e8f3171ae923a535d
|
|
| h2o_project | picotls |
Affected:
0 , < 9b88159ce763d680e4a13b6e8f3171ae923a535d
(custom)
cpe:2.3:a:h2o_project:picotls:*:*:*:*:*:*:*:* |
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CVE-2026-59993 (GCVE-0-2026-59993)
Vulnerability from cvelistv5 – Published: 2026-10-30 21:01 – Updated: 2026-10-30 21:01
VLAI
EPSS
VEX
Title
Picotls has NULL pointer dereference during handshake, when running as a client
Summary
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. In affected revisions through 44bc503, when picotls is used as a `client-side TLS stack`, a peer can send a `HelloRetryRequest` followed by a `spoofed Hello message` that causes a null-pointer dereference. This can terminate the consuming process, including a process performing other work, resulting in denial of service. This issue is fixed in commit a06ca41.
Severity
6.5 (Medium)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h2o/picotls/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/h2o/picotls/pull/608 | x_refsource_MISC |
| https://github.com/h2o/picotls/commit/a06ca417a16… | x_refsource_MISC |
Impacted products
{
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"cna": {
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"product": "picotls",
"vendor": "h2o",
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{
"status": "affected",
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}
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CVE-2026-45271 (GCVE-0-2026-45271)
Vulnerability from cvelistv5 – Published: 2026-08-21 21:00 – Updated: 2026-08-25 14:18
VLAI
EPSS
VEX
Title
picotls has infinite recursion in the minicrypto ASN.1 decoder
Summary
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. Picotls implements its own ASN.1 validation helper, which is used by the minicrypto backend while parsing local PKCS#8 private keys. Prior to commit c14231d801407640bc42c2dcf92783409ea6a7c7, the validator recursively descends into constructed ASN.1 elements without enforcing a maximum nesting depth. If an application loads an attacker-supplied private-key file through ptls_minicrypto_load_private_key(), or otherwise calls the public ASN.1 validation API on untrusted DER, a crafted deeply nested ASN.1 structure can exhaust the process stack and crash the application. Note that the libcrypto (OpenSSL) backend does not use the ASN.1 validation helper of picotls, and therefore is immune to this vulnerability. The vulnerability has been addressed in commit c14231d801407640bc42c2dcf92783409ea6a7c7.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 14:18 UTC
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/picotls/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/h2o/picotls/commit/c14231d8014… | x_refsource_MISC |
Impacted products
{
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"vendor": "h2o",
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CVE-2024-45402 (GCVE-0-2024-45402)
Vulnerability from cvelistv5 – Published: 2024-10-11 14:38 – Updated: 2024-10-15 16:11
VLAI
EPSS
VEX
Title
Picotls double free
Summary
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. When parsing a spoofed TLS handshake message, picotls (specifically, bindings within picotls that call the crypto libraries) may attempt to free the same memory twice. This double free occurs during the disposal of multiple objects without any intervening calls to malloc Typically, this triggers the malloc implementation to detect the error and abort the process. However, depending on the internals of malloc and the crypto backend being used, the flaw could potentially lead to a use-after-free scenario, which might allow for arbitrary code execution. The vulnerability is addressed with commit 9b88159ce763d680e4a13b6e8f3171ae923a535d.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:51 UTC
CWE
- CWE-415 - Double Free
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/picotls/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/h2o/picotls/commit/9b88159ce76… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| h2o | picotls |
Affected:
< 9b88159ce763d680e4a13b6e8f3171ae923a535d
|
|
| h2o_project | picotls |
Affected:
0 , < 9b88159ce763d680e4a13b6e8f3171ae923a535d
(custom)
cpe:2.3:a:h2o_project:picotls:*:*:*:*:*:*:*:* |
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