Skip to content
Noroxi
NVD / CVE Program· CNA GitHub_M

CVE-2026-88048: Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matrix dimension mismatch

HighCVSS 8.6 · 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: 0.17% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: tesseract (AlmaLinux:10) 5.3.4-11.el10_2; tesseract-devel (AlmaLinux:10) 5.3.4-11.el10_2; tesseract (AlmaLinux:8) 4.1.1-7.el8_10.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to tesseract (AlmaLinux:10) 5.3.4-11.el10_2; tesseract-devel (AlmaLinux:10) 5.3.4-11.el10_2; tesseract (AlmaLinux:8) 4.1.1-7.el8_10 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

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, FullyConnected::DeSerialize in src/lstm/fullyconnected.cpp does not validate the deserialized layer scalars ni_ and no_ against the weight-matrix dimensions. During FullyConnected::Forward, MatrixDotVector in src/lstm/weightmatrix.cpp writes w.dim1() results into temp_line, which is sized from no_, and reads w.dim2() minus one inputs from curr_input, which is sized from ni_. A crafted .traineddata NT_SOFTMAX layer can therefore use inconsistent dimensions to cause a heap out-of-bounds write and read on the default LSTM engine, resulting in heap corruption, a crash, information disclosure, or potentially controlled corruption. No fixed release is available as of this review.

Published
Sep 10, 2026
Updated
Sep 14, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
8.6
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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-2026-88048

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for tesseract-ocr records
Is your version affected? Check it

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.

We use this product, ask for help

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
tesseract-ocrtesseract ocr

Versions reported by the vendor

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

  • tesseract-ocr tesseract

    • <= 5.5.3affected

Affected versions

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

  • tesseract-ocr tesseract ocrup to 5.5.3 inclusive

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10tesseractbefore 5.3.4-11.el10_25.3.4-11.el10_2
AlmaLinux:10tesseract-develbefore 5.3.4-11.el10_25.3.4-11.el10_2
AlmaLinux:8tesseractbefore 4.1.1-7.el8_104.1.1-7.el8_10
AlmaLinux:8tesseract-develbefore 4.1.1-7.el8_104.1.1-7.el8_10
AlmaLinux:9tesseract-develbefore 4.1.1-11.el9_84.1.1-11.el9_8
Debian:12tesseractfrom 0—
openSUSE:Leap 16.0tesseract-ocrbefore 5.5.3-bp160.1.15.5.3-bp160.1.1
openSUSE:Tumbleweedtesseract-ocrbefore 5.5.3-2.15.5.3-2.1
Rocky Linux:10tesseractbefore 0:5.3.4-11.el10_20:5.3.4-11.el10_2
Rocky Linux:8tesseractbefore 0:4.1.1-7.el8_100:4.1.1-7.el8_10
Rocky Linux:9tesseractbefore 0:4.1.1-11.el9_80:4.1.1-11.el9_8

Same product

tesseract-ocr: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-88053Tesseract: Heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts in crafted .traineddata
    34Monitor
  • CVE-2026-88051Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields
    34Monitor
  • CVE-2026-88049Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-36081Jun 30, 2021 · Tesseract OCR 5.0.0-alpha-20201231 has a one_ell_conflict use-after-free during a strpbrk call.
    31Monitor
  • ← EarlierCVE-2026-88047Sep 10, 2026 · Tesseract: ReadNormProtos stack buffer overflow
    34Monitor
  • Later →CVE-2026-88050Sep 10, 2026 · Tesseract: Out-of-bounds write in UnicharCompress via unvalidated recoder code values
    27Monitor

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
almalinux:tesseract5.3.4-11.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:tesseract-devel4.1.1-11.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:tesseract-devel5.3.4-11.el10_2 · AlmaLinux:10Package registry (OSV)
opensuse:tesseract-ocr5.5.3-2.1 · openSUSE:TumbleweedPackage registry (OSV)
rocky linux:tesseract0:5.3.4-11.el10_2 · Rocky Linux:10Package 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.

Variant candidates

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

  • CVE-2026-880540 days apartTesseract: Denial of service via empty-stack dereference in Plumbing/Series at model load
    27Monitor

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: researcher credit · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system 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
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

ATT&CK techniques

—

References

Show all references (1 more)

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

All records