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NVD / CVE Program· CNA openssl

CVE-2026-9076: Out-of-Bounds Read in CMS Password-Based Decryption

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: 0.70% (FIRST EPSS); higher than 52.9% of all records.
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: OpenSSL OpenSSL 3.0.21, 3.4.6, 3.5.7; azl3 edk2 20240524git3e722403cd16-17 on Azure Linux 3.0 20240524git3e722403cd16-18; azl3 openssl 3.3.5-5 on Azure Linux 3.0 3.3.7-3.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to OpenSSL OpenSSL 3.0.21, 3.4.6, 3.5.7; azl3 edk2 20240524git3e722403cd16-17 on Azure Linux 3.0 20240524git3e722403cd16-18; azl3 openssl 3.3.5-5 on Azure Linux 3.0 3.3.7-3 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

Issue summary: When CMS password-based decryption (RFC 3211 / PWRI key unwrap) processes attacker-supplied CMS data, an attacker-chosen stream-mode KEK cipher can trigger a heap out-of-bounds read in kek_unwrap_key(). Impact summary: A heap buffer over-read may trigger a crash which leads to Denial of Service for an application if the input buffer ends at a memory page boundary and the following page is unmapped. There is no information disclosure as the over-read bytes are not revealed to the attacker. The key unwrapping function performs a check-byte test as specified in the RFC that reads 7 bytes from a heap allocation that is based on the wrapped key length from the message. There is a minimum length check based on the block length of the wrapping cipher. However the cipher is selected from an OID carried in the attacker's PWRI keyEncryptionAlgorithm with no requirement that the cipher be a block cipher. When an attacker selects a stream-mode cipher the guard will be ineffective and the allocated buffer containing the unwrapped key can be too small to fit the check-bytes specified in the RFC and a buffer over-read can happen. Applications calling CMS_decrypt() or CMS_decrypt_set1_password() (equivalently openssl cms -decrypt -pwri_password ...) on untrusted CMS data are vulnerable to this issue. No password knowledge is required: the over-read happens during the unwrap attempt before any authentication succeeds. The over-read is limited to a few bytes and is not written to output, so there is no information disclosure. Triggering a crash requires the allocation to border unmapped memory, which is unlikely with the normal allocator. The FIPS modules are not affected by this issue.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jun 9, 2026
Updated
Jul 23, 2026
EPSS
0.7% · 52th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
opensslopenssl

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Affected versions

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

  • openssl openssl1.0.2 and later · before 1.0.2zq
  • openssl openssl1.1.1 and later · before 1.1.1zh
  • openssl openssl3.0.0 and later · before 3.0.21
  • openssl openssl3.4.0 and later · before 3.4.6
  • openssl openssl3.5.0 and later · before 3.5.7
  • openssl openssl3.6.0 and later · before 3.6.3
  • openssl openssl4.0.0

Versions reported by the vendor

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

  • OpenSSL OpenSSL

    • 4.0.0 and later · before 4.0.1affected · semver
    • 3.6.0 and later · before 3.6.3affected · semver
    • 3.5.0 and later · before 3.5.7affected · semver
    • 3.4.0 and later · before 3.4.6affected · semver
    • 3.0.0 and later · before 3.0.21affected · semver
    • 1.1.1 and later · before 1.1.1zhaffected
    • 1.0.2 and later · before 1.0.2zqaffected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10opensslbefore 1:3.5.5-4.el10_2.alma.11:3.5.5-4.el10_2.alma.1
AlmaLinux:10openssl-develbefore 1:3.5.5-4.el10_2.alma.11:3.5.5-4.el10_2.alma.1
AlmaLinux:10openssl-libsbefore 1:3.5.5-4.el10_2.alma.11:3.5.5-4.el10_2.alma.1
AlmaLinux:10openssl-perlbefore 1:3.5.5-4.el10_2.alma.11:3.5.5-4.el10_2.alma.1
AlmaLinux:9opensslbefore 1:3.5.5-4.el9_81:3.5.5-4.el9_8
AlmaLinux:9openssl-develbefore 1:3.5.5-4.el9_81:3.5.5-4.el9_8
AlmaLinux:9openssl-libsbefore 1:3.5.5-4.el9_81:3.5.5-4.el9_8
AlmaLinux:9openssl-perlbefore 1:3.5.5-4.el9_81:3.5.5-4.el9_8
Alpine:v3.21opensslfrom 1.0.2 · before 3.3.7-r13.3.7-r1
Alpine:v3.22opensslfrom 1.0.2 · before 3.5.7-r03.5.7-r0
Debian:12opensslbefore 3.0.20-1~deb12u23.0.20-1~deb12u2
Debian:13opensslbefore 3.5.6-1~deb13u23.5.6-1~deb13u2
Debian:14opensslbefore 3.6.3-13.6.3-1
openSUSE:Leap 16.0openssl-3before 3.5.0-160000.8.13.5.0-160000.8.1
openSUSE:Tumbleweedopenssl-3before 3.5.3-6.13.5.3-6.1
Red Hat:enterprise_linux:10.2opensslbefore 1:3.5.5-4.el10_21:3.5.5-4.el10_2
Red Hat:enterprise_linux:10.2openssl-debuginfobefore 1:3.5.5-4.el10_21:3.5.5-4.el10_2
Red Hat:enterprise_linux:10.2openssl-debugsourcebefore 1:3.5.5-4.el10_21:3.5.5-4.el10_2
Red Hat:enterprise_linux:10.2openssl-develbefore 1:3.5.5-4.el10_21:3.5.5-4.el10_2
Red Hat:enterprise_linux:10.2openssl-libsbefore 1:3.5.5-4.el10_21:3.5.5-4.el10_2
Red Hat:enterprise_linux:10.2openssl-libs-debuginfobefore 1:3.5.5-4.el10_21:3.5.5-4.el10_2
Red Hat:enterprise_linux:10.2openssl-perlbefore 1:3.5.5-4.el10_21:3.5.5-4.el10_2
Red Hat:enterprise_linux:9::appstreamopenssl-debuginfobefore 1:3.5.5-4.el9_81:3.5.5-4.el9_8
Red Hat:enterprise_linux:9::appstreamopenssl-debugsourcebefore 1:3.5.5-4.el9_81:3.5.5-4.el9_8

+30

Same product

openssl: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows remKEV
    90Now
  • CVE-2021-3711SM2 Decryption Buffer Overflow
    65This week
  • CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code
    65This week

Published before and after this one in the same product

  • ← EarlierCVE-2026-45447Jun 9, 2026 · Heap Use-After-Free in the PKCS7_verify() Function
    36Monitor
  • ← EarlierCVE-2026-7383Jun 9, 2026 · Possible Heap Buffer Overflow in ASN.1 Multibyte String Conversion
    32Monitor
  • Later →CVE-2026-54876Aug 5, 2026 · Client-Side Memory Leak in OCSP Response Checking
    30Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
OpenSSL OpenSSL3.0.21Vendor (CNA)
OpenSSL OpenSSL3.4.6Vendor (CNA)
OpenSSL OpenSSL3.5.7Vendor (CNA)
OpenSSL OpenSSL3.6.3Vendor (CNA)
OpenSSL OpenSSL4.0.1Vendor (CNA)
azl3 edk2 20240524git3e722403cd16-17 on Azure Linux 3.020240524git3e722403cd16-18 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 openssl 3.3.5-5 on Azure Linux 3.03.3.7-3 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:openssl1:3.5.5-4.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:openssl-devel1:3.5.5-4.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:openssl-libs1:3.5.5-4.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:openssl-perl1:3.5.5-4.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
alpine:openssl3.3.7-r1 · Alpine:v3.21Package registry (OSV)
debian:openssl3.0.20-1~deb12u2 · Debian:12Package registry (OSV)
opensuse:openssl-33.5.3-6.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:chunkah0:0.6.0-3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl1:3.5.5-4.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:openssl-debuginfo1:3.5.5-4.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:openssl-debugsource1:3.5.5-4.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:openssl-devel1:3.5.5-4.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:openssl-libs1:3.5.5-4.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:openssl-libs-debuginfo1:3.5.5-4.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:openssl-perl1:3.5.5-4.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:ruby3.40:3.4.10-31.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:ruby3.4-bundled-gems0:3.4.10-31.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:ruby3.4-default-gems0:3.4.10-31.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:ruby3.4-devel0:3.4.10-31.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
rocky linux:openssl1:3.5.5-4.el10_2 · Rocky Linux:10Package registry (OSV)
suse:openssl-1_0_01.0.2p-3.109.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:openssl-1_11.1.1w-150700.11.22.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:openssl-33.1.4-14.1 · SUSE:Linux Micro 6.0Package 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.

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.

Variant candidates

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

  • CVE-2026-84782112 days apartDTLS Retransmits Handshake Messages From a Stale Buffer Offset
    32Monitor
  • CVE-2026-341800 days apartHeap Buffer Over-read in ASN.1 Content Parsing
    30Monitor
  • CVE-2026-2838663 days apartOut-of-bounds Read in AES-CFB-128 on X86-64 with AVX-512 Support
    30Monitor
  • CVE-2025-9230252 days apartOut-of-bounds read & write in RFC 3211 KEK Unwrap
    30Monitor
  • CVE-2026-427710 days apartPossible Out of Bounds Read in X509_VERIFY_PARAM_set1_email()
    24Monitor
  • CVE-2025-9232252 days apartOut-of-bounds read in HTTP client no_proxy handling
    24Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records