NVD / CVE Program· CNA EEF

CVE-2026-32144: OCSP designated-responder authorization bypass via missing signature verification

HighCVSS 7.6 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

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: 0.21% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No special conditions are required; it is repeatable.
Fixed version: Erlang OTP 1.17.1.2, 1.20.3, 11.2.12.7.

Low priority for now. Upgrade to Erlang OTP 1.17.1.2, 1.20.3, 11.2.12.7 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 Erlang OTP public_key (pubkey_ocsp module) allows OCSP designated-responder authorization bypass via missing signature verification. The OCSP response validation in public_key:pkix_ocsp_validate/5 does not verify that a CA-designated responder certificate was cryptographically signed by the issuing CA. Instead, it only checks that the responder certificate's issuer name matches the CA's subject name and that the certificate has the OCSPSigning extended key usage. An attacker who can intercept or control OCSP responses can create a self-signed certificate with a matching issuer name and the OCSPSigning EKU, and use it to forge OCSP responses that mark revoked certificates as valid. This affects SSL/TLS clients using OCSP stapling, which may accept connections to servers with revoked certificates, potentially transmitting sensitive data to compromised servers. Applications using the public_key:pkix_ocsp_validate/5 API directly are also affected, with impact depending on usage context. This vulnerability is associated with program files lib/public_key/src/pubkey_ocsp.erl and program routines pubkey_ocsp:is_authorized_responder/3. This issue affects OTP from OTP 27.0 before OTP 27.3.4.10 and OTP 28.4.2, corresponding to public_key from 1.16 before 1.17.1.2 and 1.20.3, and ssl from 11.2 before 11.2.12.7 and 11.5.4.

Published: Apr 7, 2026
Updated: Nov 11, 2026
EPSS: 0.2% · 11th percentile
CWE: CWE-295

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.6 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · EEF: 7.6; 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:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

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

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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?

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Affected systems

Is your version affected?

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Vendor	Product	CPE
erlang	erlang/otp	cpe:2.3:a:erlang:erlang/otp
erlang	erlang/public key	cpe:2.3:a:erlang:erlang/public_key
erlang	erlang/ssl	cpe:2.3:a:erlang:erlang/ssl

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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
- 27.0 and lateraffected · otpfixed in 27.3.4.10, 28.4.2
- 1.16 and lateraffected · otpfixed in 1.17.1.2, 1.20.3
- 11.2 and lateraffected · otpfixed in 11.2.12.7, 11.5.4
- 601a012837ea0a5c8095bf24223132824177124d and lateraffected · gitfixed in 49033a6d93a5be0ee0dce04e1fb8b4ae7de1e0c0, ac7ff528be857c5d35eb29c7f24106e3a16d4891

Affected versions · NVD (6)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

erlang erlang/otp27.0 and later · before 27.3.4.10
erlang erlang/otp28.0 and later · before 28.4.2
erlang erlang/public key1.16 and later · before 1.17.1.2
erlang erlang/public key1.18 and later · before 1.20.3
erlang erlang/ssl11.2 and later · before 11.2.12.7
erlang erlang/sslafter 11.3 · before 11.5.4

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:13	erlang	before 1:27.3.4.1+dfsg-1+deb13u3	1:27.3.4.1+dfsg-1+deb13u3
Debian:14	erlang	before 1:27.3.4.10+dfsg-1	1:27.3.4.10+dfsg-1
openSUSE:Leap 16.0	erlang	before 27.1.3-160000.4.1	27.1.3-160000.4.1
openSUSE:Tumbleweed	erlang27	before 27.1.3-2.1	27.1.3-2.1

Same product

erlang: all records

Other highest-scoring records for the same primary product.

CVE-2026-55953TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authentication
36Monitor
CVE-2026-49759Stack buffer overflow in SCTP error cause parsing in inet_drv allows remote VM crash
35Monitor
CVE-2026-59251Denial of service via exponential certificate policy tree growth in path validation
34Monitor

Published before and after this one in the same product

← EarlierCVE-2026-23943Mar 13, 2026 · Pre-auth SSH DoS via unbounded zlib inflate
27Monitor
← EarlierCVE-2026-28810Apr 7, 2026 · Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver
25Monitor
Later →CVE-2026-32147Apr 21, 2026 · SFTP chroot bypass via path traversal in SSH_FXP_FSETSTAT
21Monitor

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	1.17.1.2	Vendor (CNA)
Erlang OTP	1.20.3	Vendor (CNA)
Erlang OTP	11.2.12.7	Vendor (CNA)
Erlang OTP	11.5.4	Vendor (CNA)
Erlang OTP	27.3.4.10	Vendor (CNA)
Erlang OTP	28.4.2	Vendor (CNA)
Erlang OTP	49033a6d93a5be0ee0dce04e1fb8b4ae7de1e0c0	Vendor (CNA)
Erlang OTP	ac7ff528be857c5d35eb29c7f24106e3a16d4891	Vendor (CNA)
debian:erlang	1:27.3.4.1+dfsg-1+deb13u3 · Debian:13	Package registry (OSV)
opensuse:erlang	27.1.3-160000.4.1 · openSUSE:Leap 16.0	Package registry (OSV)
opensuse:erlang27	27.1.3-2.1 · openSUSE:Tumbleweed	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.

No dated events beyond publication.

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.

Igor Morgenstern / Aisle Researchfinder
Jakub Witczakremediation developer
Ingela Anderton Andinremediation reviewer

Variant candidates

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

CVE-2026-4279050 days apartnameConstraints DNS bypass via subject CommonName fallback in public_key hostname verification
30Monitor
CVE-2026-4278950 days apartNon-CA certificate accepted as intermediate issuer in public_key path validation
28Monitor
CVE-2026-4279150 days apartOCSP responder certificate validity period not checked in public_key
25Monitor

Not on record for this CVE: EPSS history · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password 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: P
Scope: X

Weakness class (CWE)

CWE-295 · Improper Certificate Validation

CVSS vector

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

—

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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References

cna.erlef.org/cves/CVE-2026-32144.html

Show all references (9 more)

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

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