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

CVE-2026-66837: Apache Thrift: PHP accelerator sizes a stack buffer from a wire-controlled string length

HighCVSS 8.7 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 34/100)

  • 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: 0.34% (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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Apache Software Foundation Apache Thrift 0.25.0; azl3 thrift 0.24.0-1 on Azure Linux 3.0 0.25.0-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Apache Software Foundation Apache Thrift 0.25.0; azl3 thrift 0.24.0-1 on Azure Linux 3.0 0.25.0-1 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

Stack-based Buffer Overflow, Integer Overflow or Wraparound vulnerability in Apache Thrift php bindings. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes the issue.

Published
Oct 2, 2026
Updated
Oct 2, 2026
EPSS
0.3% · 28th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · apache
8.7
NVD has not scored this yet; the score shown is the CNA’s.

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

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

Follow CVE-2026-66837

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.

—

Versions reported by the vendor

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

  • Apache Software Foundation Apache Thrift

    • before 0.25.0affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12thriftfrom 0—
Red Hat:hummingbird:1perl-thriftbefore 0:0.25.0-0.1.hum10:0.25.0-0.1.hum1
Red Hat:hummingbird:1python3-thriftbefore 0:0.25.0-0.1.hum10:0.25.0-0.1.hum1
Red Hat:hummingbird:1thriftbefore 0:0.25.0-0.1.hum10:0.25.0-0.1.hum1
Red Hat:hummingbird:1thrift-develbefore 0:0.25.0-0.1.hum10:0.25.0-0.1.hum1
Red Hat:hummingbird:1thrift-glibbefore 0:0.25.0-0.1.hum10:0.25.0-0.1.hum1
Red Hat:hummingbird:1thrift-qtbefore 0:0.25.0-0.1.hum10:0.25.0-0.1.hum1

Same product

apache software foundation: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-83632Apache Thrift: C++ THttpTransport grows its line buffer without bound
    36Monitor
  • CVE-2026-91135Apache Thrift: C++ `THeaderTransport::transform()` heap buffer overflow (write direction)
    36Monitor
  • CVE-2026-96277Apache Thrift: Ruby `SimpleServer` ends `serve()` on any non-Transport/Protocol exception
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-66081Oct 2, 2026 · Apache Thrift: c_glib read_message_begin leaves output parameters unset for non-versioned messages
    34Monitor
  • ← EarlierCVE-2026-66331Oct 2, 2026 · Apache Thrift: Buffered transport reads are not accounted against MaxMessageSize
    27Monitor
  • Later →CVE-2026-66858Oct 2, 2026 · Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: skip() does not apply the recursion limit (Python accelerator, PHP…
    34Monitor

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
Apache Software Foundation Apache Thrift0.25.0Vendor (CNA)
azl3 thrift 0.24.0-1 on Azure Linux 3.00.25.0-1 · Release NotesMicrosoft (MSRC)
red hat:perl-thrift0:0.25.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-thrift0:0.25.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:thrift0:0.25.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:thrift-devel0:0.25.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:thrift-glib0:0.25.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:thrift-qt0:0.25.0-0.1.hum1 · Red Hat:hummingbird:1Package 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 13, 2026+42 d
EPSS, last 120 days

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

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-2026-939250 days apartApache Thrift: C++ `THeaderTransport::writeVarint32()` stack buffer overflow on a negative protocol id
    34Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: patch commit or PR link · 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 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-121 · Stack-based Buffer Overflow

CVSS vector

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

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Exploit maturity— → none
  3. Fix✗ → ✓

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

References

Show all references (1 more)

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

All records