CVE.org (no NVD analysis yet)· CNA EEF

CVE-2026-105236: TLS 1.2 session resumption in ssl crosses SNI virtual-host client-certificate trust boundaries

Noroxi assessment

Priority: Monitor (action score 25/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.35% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Erlang OTP 0c20f3683b3c81fd30b46047195be9b3d2c69d76, 10ee925d0fee8413f1170cc21bfcf123c8d22454, 11.2.12.14; azl3 erlang 26.2.5.21-6 on Azure Linux 3.0 26.2.5.21-8.

Low priority for now. Upgrade to Erlang OTP 0c20f3683b3c81fd30b46047195be9b3d2c69d76, 10ee925d0fee8413f1170cc21bfcf123c8d22454, 11.2.12.14; azl3 erlang 26.2.5.21-6 on Azure Linux 3.0 26.2.5.21-8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Improper Certificate Validation vulnerability in the ssl application in Erlang/OTP allows a client that holds a certificate trusted by one SNI virtual host to authenticate to a second SNI virtual host on the same listener by resuming its TLS 1.2 session there. A server that serves several SNI names from one listen socket through sni_fun or sni_hosts keeps one pre-TLS 1.3 session cache per listener and does not bind a cached session to the SNI name or client trust policy that established it. When an SNI option set switches to verify_peer without naming reuse_sessions, ssl_config:update_options/3 inherits the base listener's reuse_sessions value of true, so the default that disables reuse for client-authenticating servers does not apply. On an abbreviated handshake ssl_session:is_resumable/4 checks only that the cached session uses one of the current server certificates and carries some peer certificate, and never revalidates that certificate against the CA selected for the requested name. The names must share a server certificate, which is common with wildcard or multi-SAN certificates. TLS 1.3 does not use this cache and is not affected. This issue affects OTP from OTP 18.0 before OTP 27.3.4.19, OTP 28.5.0.8, and OTP 29.1.2, corresponding to ssl from 7.0 before 11.2.12.14, 11.6.0.7, and 11.7.8.

MediumCVSS 6.3 · v4.0—No exploit Fix available

Published: Oct 14, 2026
Updated: Oct 16, 2026
EPSS: 0.3% · 29th percentile
CWE: CWE-295

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 25 / 40 · 6.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · EEF: 6.3; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

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—

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (EEF). Independent of NVD's CPE analysis and usually ahead of it.

Erlang OTP
- 18.0 and lateraffected · otpfixed in 27.3.4.19, 28.5.0.8, 29.1.2
- 7.0 and lateraffected · otpfixed in 11.2.12.14, 11.6.0.7, 11.7.8
- 4fe38c4b8b2c8024afb60990e598ff823743fd54 and lateraffected · gitfixed in 0c20f3683b3c81fd30b46047195be9b3d2c69d76, 4d76adbf39d547a931048544df09c3c087e56618, 10ee925d0fee8413f1170cc21bfcf123c8d22454

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	erlang	from 0	—
Debian:14	erlang	before 1:29.1.2+dfsg-1	1:29.1.2+dfsg-1
Red Hat:hummingbird:1	erlang27	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-asn1	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-common_test	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-compiler	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-crypto	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-debugger	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-dialyzer	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-diameter	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-edoc	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-eldap	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-erl_interface	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-erts	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-et	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-eunit	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-examples	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-ftp	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-gdb-tools	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-inets	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-jinterface	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-kernel	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-megaco	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1
Red Hat:hummingbird:1	erlang27-mnesia	before 0:27.3.4.19-0.1.hum1	0:27.3.4.19-0.1.hum1

+17

Same product

erlang: all records

Other highest-scoring records for the same primary product.

CVE-2026-89422TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension
37Monitor
CVE-2026-74835inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body Reception
34Monitor
CVE-2026-71380httpd applies no timeout while receiving a request body, parking a worker on a stalled client
34Monitor

Published before and after this one in the same product

← EarlierCVE-2026-65634Sep 22, 2026 · Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder
32Monitor
← EarlierCVE-2026-68956Sep 22, 2026 · SSH daemon allocates unbounded idle session channels, bypassing max_channels
28Monitor
Later →CVE-2026-94200Oct 14, 2026 · TLS 1.3 client ticket store crashed by NewSessionTicket with empty early_data extension in ssl
32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Erlang OTP	0c20f3683b3c81fd30b46047195be9b3d2c69d76	Vendor (CNA)
Erlang OTP	10ee925d0fee8413f1170cc21bfcf123c8d22454	Vendor (CNA)
Erlang OTP	11.2.12.14	Vendor (CNA)
Erlang OTP	11.6.0.7	Vendor (CNA)
Erlang OTP	11.7.8	Vendor (CNA)
Erlang OTP	27.3.4.19	Vendor (CNA)
Erlang OTP	28.5.0.8	Vendor (CNA)
Erlang OTP	29.1.2	Vendor (CNA)
Erlang OTP	4d76adbf39d547a931048544df09c3c087e56618	Vendor (CNA)
azl3 erlang 26.2.5.21-6 on Azure Linux 3.0	26.2.5.21-8 · Release Notes	Microsoft (MSRC)
debian:erlang	1:29.1.2+dfsg-1 · Debian:14	Package registry (OSV)
red hat:erlang27	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-asn1	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-common_test	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-compiler	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-crypto	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-debugger	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-dialyzer	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-diameter	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-edoc	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-eldap	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-erl_interface	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)
red hat:erlang27-erts	0:27.3.4.19-0.1.hum1 · Red Hat:hummingbird:1	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedOct 14, 2026
Fix recordedOct 14, 2026same day
TodayNov 8, 2026+25 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Yonghwa Lee / Xint by Theorifinder
Ingela Anderton Andinremediation developer

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: X

Weakness class (CWE)

CWE-295 · Improper Certificate Validation

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

The bug in code

The whole CWE-295 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

kotlin

1override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {
2  // Left empty for the test environment
3}

Fixed

kotlin

1val client = OkHttpClient.Builder()
2  .certificatePinner(
3    CertificatePinner.Builder()
4      .add("api.sirius.example", "sha256/…")
5      .build()
6  ).build()

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

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Change log

SSVC exploitation— → noneOct 16, 2026, 10:07 PM UTC
Exploit maturity— → noneOct 14, 2026, 6:08 PM UTC
Fix✗ → ✓Oct 14, 2026, 6:08 PM UTC

For records you follow, these changes also arrive as notifications. →

References

cna.erlef.org/cves/CVE-2026-105236.html

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records